Under the Dome

[Image: Courtesy U.S. Department of the Interior Bureau of Ocean Energy Management (BOEM)].

A gigapixel bathymetric map of the Gulf of Mexico’s seabed has been released, and it’s incredible. The newly achieved level of detail is almost hard to believe.

[Images: Courtesy U.S. Department of the Interior Bureau of Ocean Energy Management (BOEM)].

The geology of the region is “driven not by plate tectonics but by the movement of subsurface bodies of salt,” Eos reported last week. “Salt deposits, a remnant of an ocean that existed some 200 million years ago, behave in a certain way when overlain by heavy sediments. They compact, deform, squeeze into cracks, and balloon into overlying material.”

This means that the bottom of the Gulf of Mexico “is a terrain continually in flux.”

How the salt got there is the subject of a long but fascinating description at Eos.

It is hypothesized that the salt precipitated out of hypersaline seawater when Africa and South America pulled away from North America during the Triassic and Jurassic, some 200 million years ago. The [Gulf of Mexico] was initially an enclosed, restricted basin into which seawater infiltrated and then evaporated in an arid climate, causing the hypersalinity (similar to what happened in the Great Salt Lake in Utah and the Dead Sea between Israel and Jordan).

Salt filled the basin to depths of thousands of meters until it was opened to the ancestral Atlantic Ocean and consequently regained open marine circulation and normal salinities. As geologic time progressed, river deltas and marine microfossils deposited thousands more meters of sediments into the basin, atop the thick layer of salt.

The salt, subjected to the immense pressure and heat of being buried kilometers deep, deformed like putty over time, oozing upward toward the seafloor. The moving salt fractured and faulted the overlying brittle sediments, in turn creating natural pathways for deep oil and gas to seep upward through the cracks and form reservoirs within shallower geologic layers.

These otherwise invisible landscape features “oozing upward” from beneath the seabed are known as salt domes, and they are not only found at the bottom of the Gulf of Mexico.

[Image: Avery Island, Louisiana, archived by the U.S. Library of Congress].

The black and white photos you see here are from a salt mine on Avery Island, Louisiana, archived by the U.S. Library of Congress. The photos date back as far as 1900, and they’re gorgeous.

[Image: Avery Island, Louisiana, archived by the U.S. Library of Congress].

This is what it looks like inside those salt domes, you might way, once industrially equipped human beings have carved wormlike topological spaces into the deformed, ballooning salt deposits of the region.

[Image: Avery Island, Louisiana, archived by the U.S. Library of Congress].

Obviously, the Gulf of Mexico is not the only salt-rich region of the United States; there is a huge salt mine beneath the city of Detroit, for example, and the nation’s first nuclear waste repository, the Waste Isolation Pilot Plant, or WIPP—which my wife and I had the surreal pleasure of visiting in person back in 2012—is dug into a huge underground salt deposit near the New Mexico/Texas border.

[Image: Inside WIPP; photo by Nicola Twilley].

Nonetheless, the Louisiana/Gulf of Mexico salt dome region has lent itself to some particularly provocative landscape myths.

You might recall, for example, the story of Lake Peigneur, an inland body of water that was almost entirely drained from below when a Texaco drilling rig accidentally punctured a salt dome beneath the lake.

This led to the sight of a rapid, Edgar Allan Poe-like maelström of swirling water disappearing into the abyss, pulling no fewer than eleven barges into the terrestrial deep.

[Image: Avery Island, Louisiana, archived by the U.S. Library of Congress].

But there is also the story of Bayou Corne, one of my favorite conspiracy theories of all time.

[Images: Avery Island, Louisiana, archived by the U.S. Library of Congress].

As the New York Times reported back in 2013, “in the predawn blackness of Aug. 3, 2012, the earth opened up—a voracious maw 325 feet across and hundreds of feet deep, swallowing 100-foot trees, guzzling water from adjacent swamps and belching methane from a thousand feet or more beneath the surface.”

One resident of the area is quoted as saying, “I think I caught a glimpse of hell in it.”

More than a year after it appeared, the Bayou Corne sinkhole is about 25 acres and still growing, almost as big as 20 football fields, lazily biting off chunks of forest and creeping hungrily toward an earthen berm built to contain its oily waters. It has its own Facebook page and its own groupies, conspiracy theorists who insist the pit is somehow linked to the Gulf of Mexico 50 miles south and the earthquake-prone New Madrid fault 450 miles north. It has confounded geologists who have struggled to explain this scar in the earth.

To oversimplify things, the overall theory—that is, the conspiratorial part of all this—is that the entire landscape of the Gulf region is on the verge of subterranean dissolution. The very salt deposits so beautifully mapped by the Bureau of Ocean Energy Management are all lined up for eventual flooding.

As this vast underground landscape of salt dissolves, everything from east Texas to west Florida will be sucked down into the abyss.

[Image: Avery Island, Louisiana, archived by the U.S. Library of Congress].

It’s unlikely that this will happen, I should say. You can sleep well at night.

In the meantime, the sorts of salt-mining operations depicted here in these photographs have carved their worming, subterranean way into the warped terrains of salt that dynamically ooze their way up to the surface from geological prehistory.

[Image: Avery Island, Louisiana, archived by the U.S. Library of Congress].

Be sure to check out the full gigapixel BOEM map, and the helpful write-up over at Eos is worth a read, as well. As for the Bayou Corne conspiracy—I suppose we’ll just have to wait.

(Bathymetric maps spotted via Chris Rowan; salt mine photos originally spotted a very long time ago via Attila Nagy).

The Voids Beneath

sinkhole[Image: Drone footage of a Cornwall garden sinkhole, via the BBC].

One of the peculiar pleasures of reading Subterranea, a magazine published by Subterranea Britannica, is catching up on British sinkhole news.

In more or less every issue, there will be tales of such things as “a mysterious collapse in a garden behind a 19th-century house,” that turns out to be a shaft leading down into a forgotten sand mine, or of “abandoned chalk mine sites” heavily eroding in winter rain storms, “resulting in roof-falls.”

“As most chalk mines are at relatively shallow depth,” Subterranea reports, “these roof-falls migrate upwards to break [the] surface as ‘crown holes’ or craters, which in the said winter [of 2013/2014] have been appearing in lawns and driveways, and even under houses, newly built in chalk districts.”

The earth deceptively hollow, the landscape around you actually a ceiling for spaces beneath.

Worryingly, many of these mines and underground quarries are difficult, if not impossible, to locate, as insufficient regulation combined with shabby documentation practices mean that there could be abandoned underground workings you might never be aware of hiding beneath your own property—until next winter’s rains kick in, that is, or the next, when you can look forward to staring out at the grass and shrubbery, with growing angst, waiting for sinkholes to appear. Rain becomes a kind of cave-finding technology.

Even in the heart of London, the underworld beckons. Last Spring, Subterranea reminds us, “a woman and her shopping trolley rather suddenly disappeared into a four metres deep hole in North End Road, Fulham.” The culprit? It “appears to have been a disused under-street coal cellar.”

Perhaps the most incredible recent example, however, comes from the town of Scorrier, in Cornwall.

shaft[Image: Photo courtesy The Sun].

There, a “deep mine shaft has appeared” beneath the patio of a house in the process of being prepped for sale. “The shaft drops approximately 300 feet deep to water but could be four or five times deeper [!] below that,” Subterranea reports. It “is a remnant of Cornwall’s tin mining industry in the 18th century.”

It is a straight vertical shaft, more like a rectangular well, yawning open behind the house.

And there are many more of these mines and quarries, still waiting to be discovered: “As mines closed,” we read, “many [mining companies] put very large blocks of timber, often old railway sleepers, across shafts and backfilled them, thinking this would be safe. Gradually all evidence of the engine houses and covered shafts disappeared from view and memory and in the past builders assumed there was nothing there. Had they consulted old maps they would have known about the shaft. The timbers rotted over the years and collapses like this often happen after long periods of rain, which they have had in this area.”

There’s something both uncanny and compelling about the idea that, with seasons of increased rainfall due to climate change, the nation’s mining industry might stage an unsettling reappearance, bursting open in subterranean splendor to swallow the surface world whole.

Think of it as an industrial-historical variation on the El Niño rains in Los Angeles—where huge storms were suspected of “unearthing more skeletal human remains” in the parched hills outside the city—only here given the horror movie ambience of murderous voids opening up beneath houses, making their abyssal presence felt after long winter nights of darkness and endless rain.

In any case, consider joining Subterranea Britannica for a subscription to Subterranea for more sinkhole news.

American Mine

[Image: “American Mine (Carlin, Nevada 2, 2007)” by David Maisel].

The following essay was previously published under the title “Infinite Exchange” in Black Maps by David Maisel (Steidl), as well as in Cabinet Magazine #50.

1.
In a 2011 paper on the medical effects of scurvy, author Jason C. Anthony offers a remarkable detail about human bodies and the long-term presence of wounds.

“Without vitamin C,” Anthony writes, “we cannot produce collagen, an essential component of bones, cartilage, tendons and other connective tissues. Collagen binds our wounds, but that binding is replaced continually throughout our lives. Thus in advanced scurvy”—reached when the body has gone too long without vitamin C—“old wounds long thought healed will magically, painfully reappear.”

In a sense, there is no such thing as healing. From paper cuts to surgical scars, our bodies are catalogues of wounds: imperfectly locked doors quietly waiting, sooner or later, to spring back open.

[Image: “American Mine (Carlin, Nevada 5, 2007)” by David Maisel].

2.
The Carlin Trend was discovered in north-central Nevada, near the town of Elko, in 1962. Some fifty years later, at this time of writing, it remains one of the world’s largest actively mined deposits of gold ore. In fact, the region has become something of a category-maker in the gold industry today, which describes analogous landscapes and ore bodies as “Carlin-type” deposits. The Carlin Trend is a standard, in other words: a referent against which others are both literally and rhetorically measured.

The trend’s discovery and subsequent exploitation—and the extraordinary negative landforms that have resulted from its exhumation—has been a story of nineteenth-century U.S. mining laws, legally dubious provisions governing public land, extraction industry multinationals, advanced geological modeling software, specialty equipment few people can name let alone operate, and genetically modified bacteria mixed into vats of gold-harvesting slurry.

[Image: “American Mine (Carlin, Nevada 1, 2007)” by David Maisel].

Writing in 1989, John Seabrook of The New Yorker pointed out that, in the previous eight years alone, more gold had been mined from the Carlin Trend “than came out of any of the bonanzas that feature so prominently in our national mythology, including the California bonanza of 1849.” That’s because gold in the region is all but ubiquitous, peppered and snaked throughout Nevada:

There is gold in the Battle Mountain Formation, the range that runs southeast of town; gold in the alluvium to the west; gold in the Black Rock Desert to the northwest; gold in the Sheep Creek Range and in the Tuscarora Mountains to the northeast. The Tuscaroras are especially rich. Along the Carlin Trend, a forty-mile stretch of this range, are twelve deposits. Some people believe that a much richer swatch of ore, a deposit to rival South Africa’s Gold Reef, runs unbroken under the Carlin Trend, perhaps three thousand feet down—more than three times as deep as the deepest mines there now go.

“Some people believe”: more is hidden in the apparent neutrality of Seabrook’s phrase than we might at first suspect. Mining for gold—the actual, violent excision of waste rock from the earth, searching for ore—is never a question of finding a perfect, shiny lump of solid metal and carefully, surgically removing it from the planet. Gold is diffuse. It is now more often mined as particles, not blocks or even nuggets. Like glitter, it is scattered throughout the rocks around it.

In fact, the presence of gold, in many cases, can only be inferred. The angle at which local rock strata dip back into the planet, the direction water flows through the landscape, or the complex of other minerals and crystals locked in the rocks underground: these all, to varying degrees, act as telltale signatures for the famously coy king of metals.

[Image: “American Mine (Carlin, Nevada 18, 2007)” by David Maisel].

Looking for these signatures entails a peculiar mix of local folklore and verified science, and the hunt—sometimes life-consuming, sometimes maddening—for signs is exhaustively documented by what Seabrook calls “prospecting paraphernalia: geological reports, assay figures, maps, contracts, aerial photographs, electromagnetic surveys, gravitometer readings, lawsuits, letters from people who think they have gold on their property, letters from people who know people who have gold on their property.”

Gold is less discovered, we might say, than interpreted.

The Carlin Trend has thus served as a test site, now in its fifty-first year, for various interpretive techniques, both scientific and superstitious. Specialty journals refer to the region’s “geochemical patterns”—only fragments of which are available to them to analyze for “the characteristics, signatures, and genesis of Nevada’s world-class gold systems”—the idea being that these might be found again elsewhere and thus be more instantly recognizable. Geologists track concentrations, contours, “metal zones,” and mineralized fractures; they build models of “stacked geochemical anomalies” in the earth below, hoping to piece together an accurate model of the gold ore’s location.

[Image: “American Mine (Carlin, Nevada 8, 2007)” by David Maisel].

Where the gold came from in the first place is yet another interpretive preoccupation. A paper—forthrightly titled “Is the Ancestral Yellowstone Hotspot Responsible for the Tertiary ‘Carlin’ Mineralization in the Great Basin of Nevada?”—suggests that the gold of the Carlin Trend is actually a thermal after-effect, or geochemical ghost, of the still-nomadic Yellowstone hotspot that once pulsed and geysered beneath Nevada.

The language used to describe these deposits is often extraordinary. We read, for instance, that discontinuous ore bodies apparently produced at different “stages of mineralization” in the earth’s history might, in fact, be “part of a single event that evolved chemically through time.” That is, one state-sized geological event—with titanic embryos merging and splitting inside the earth—delicately infused into the landscape from below as slow pulses of mineral-rich magmatic fluid freeze into spidery veins of precious metal. Or we read about “anomaly-related mineral assemblages,” millions of years’ worth of “mineralizing events,” and “geochemical halos in this part of the Carlin Trend.” Industrial descriptions of the earth’s interior lend an unexpected poetry to the act of mining.

Another way of saying all this is that mind-bogglingly large terrestrial events, occurring invisibly below ground in rock formations we can only measure indirectly—scanning the earth for hidden signatures—produce ore bodies, the excavation, dismemberment, and eventual global distribution of which shapes human economic history in turn.

[Image: “American Mine (Carlin, Nevada 10, 2007)” by David Maisel].

In any case, the form of a gold deposit itself must be mapped and clarified before excavation can begin. The shape of the ensuing pit is not the result of frantic, directionless digging, but of a carefully controlled design process. The word “design” is used deliberately here, even if the shape of the pit is orchestrated not by aesthetics but by the needs of financial rationality. Using proprietary graphics software—similar in function to visual effects programs used in film, gaming, and architecture—the ore body is predictively 3D-modeled.

Mining, at this point, becomes less an act of extraction than of physical verification: machines and their profit-minded operators pursue the outlines of a virtual form by gradually expanding the mine’s target zones, in effect checking to see if the geologists’ models were right.

As architect Liam Young suggested in a recent interview, conducted after he returned from leading a group of design students on a research trip to the gold mines of Western Australia,

mining engineers are basically designers. They develop all these fragmentary data into models, which become the design of the pit itself. … But then what happens is, based on gold prices, the pit model changes. In other words, if the gold price or the mineral price is higher, then the pit gets wider as it becomes cost-effective to mine areas of lower concentration. This happens nearly in real time—the speed of the machines digging the pit can change over the course of the day based on the price of gold, so the geometry of the pit is utterly parametric, modeling these distant financial calculations.

In essence, Young suggests, mining engineers produce and explore speculative models of gold distribution in the rocks below ground. Using surprisingly low-res data taken from seismic tests and weighing that data against equipment availability, labor costs, and, most importantly, the internationally recognized price of gold, the extraordinary ballet of machines can begin.

This then becomes predictive on a much larger scale, as well. By constantly refining their models of how exactly gold forms in the first place, and where and how it can be mined most effectively, geologists can understand where—and, to some extent, predict when—future ore bodies might accumulate. Interestingly, these future deposits will appear on a timescale that far exceeds human civilization—so, while human miners most likely won’t be around to exploit them, it’s nonetheless intriguing to know that serpent-like veins of precious metal are incubating in the darkness beneath us.

[Images: (top) “American Mine (Carlin, Nevada 12, 2007)“; (bottom) “American Mine (Carlin, Nevada 13, 2007),” by David Maisel].

Here we return to Seabrook, who warns that “there is a good deal of poetry in these figures,” of ounces mined and subterranean veins discovered. “They are based on statistical models, a kind of three-dimensional game of connect the dots played by a computer.”

These are then treated explicitly and formally as works of art: Seabrook points out “a computer-generated three-dimensional picture of the ore body, dry-mounted and framed,” hanging on a geologist’s office wall. Call it the new Subterranean Romantic:

Mining people have a habit of stretching the metaphor when they talk about their ore bodies. They say how beautiful, how satisfying, how tantalizing their ore body is, they make hourglass shapes with their hands, knead with their fingers, smooth with their palms as they talk.

These gorgeous bodies, removed from the earth, leave scars: precisely designed but roughly implemented holes—exit wounds of temporally contingent value—clearly and deliriously visible from above.

[Images: “American Mine (Carlin, Nevada 12, 2007)” by David Maisel].

3.
The very idea that gold has value is a funny thing. Aside from a few basic industrial uses, gold’s value is almost entirely ornamental—that is, it is agreed upon by financial traders and metals futures markets, even if no actual gold changes hands. Gold comes out of one, very carefully designed hole in the ground—whether in Nevada, South Africa, or Western Australia—only, most likely, to be interred again in another part of the world in a bank vault or federal reserve, where it is precisely gold’s removal from direct exchange that augments its value and its mystery.

Mystery is not used lightly. In his odd but insightful study of the various symbolic entanglements between gold, cocaine, violence, and colonial labor in South America, anthropologist Michael Taussig writes, with suitably mythic overtones: “How perfect is gold, the great shape-changer, the liquid metal, the formless form.”

This “formless form,” however, undergoes a strange—we might say alchemical—transformation, from shining metal to the rarefied super-object known as money. In a long description based on a memoir by Captain Amasa Delano, Taussig recounts the nineteenth-century process of minting coins from gold bullion:

The gold ore was wetted and kneaded by blacks treading on it with their feet on a paved brick surface after which they put mercury on it so as to separate out the gold. Then the metal was heated, becoming red as blood. To get the liquid metal to run from its crucible, the spout was touched with a stick with a piece of cloth around it. When this stick made contact, there was a flash and the metal began to run in a stream not much thicker than a pipe stem. The bars of gold formed were subsequently squeezed flat by rollers until the thickness of a dollar or doubloon, by which time the bars had become sheets four feet long. A powerful press cut coins out from these thin sheets like a cookie cutter, and the pieces were turned to receive a milled edge. Then came the weighing.

For Taussig, this process reveals the machinations “both mysterious and everyday” by which a mineral becomes money—that is, how “gold and silver coins become enchanted, material things, aglow with a power emanating from deep within.” This base matter has been transformed, given exchange-value through formal regularity and sent off to participate in a global system of monetary transactions.

Gold coins are thus but one of the “minutiae in which the supernatural is secularized”: a haunted mineral is pulled from the earth and given an uncanny second life elsewhere.

[Image: “American Mine (Carlin, Nevada 22, 2007)” by David Maisel].

The spectral mathematics that can turn reserves of gold into abstract instruments of monetary exchange—into financial products and debt instruments, derivatives and funds—operates through a barely comprehensible carnival of surrogates flashing back and forth through the global marketplace. Until the end of the Bretton Woods system in August 1971, when the US dollar was unilaterally decoupled from the international gold standard, gold served as a reliable, universally recognized equivalent for economic exchange.

Gold, in the words of Jean-Joseph Goux, himself citing Marx, had value precisely because it could so effectively disappear into the “circulation of substitutes.” This is a logic of exchange by which Object A can be traded for Object B, as long as we agree that Object B also refers, off-stage, to something else entirely: some standard or reserve for which it acts as a practical surrogate.

Before 1971, that off-stage presence—that silent original, sleeping in a state of eternal reservation—was gold.

[Image: “American Mine (Carlin, Nevada 20, 2007)” by David Maisel].

To say, then, that there is an “economy” is thus to use shorthand for what Goux describes as “a regulated process of equivalents and substitutions,” whereby stand-ins, equivalents, and acceptable replacements all interact in occulted reference to an absentee original. The natural hard matter of gold, artificially extracted from the earth, thus becomes caught up in a supernatural system of objects: coins, bills, and derivatives—future duplicates and doubles.

In this context, the ongoing attempts to return the United States to the gold standard—by, for instance, perennial Republican presidential candidate Ron Paul—can be seen as an almost folkloristic attempt to put the genie of infinite derivative exchange back in the bottle.

Sites like Nevada’s Carlin Trend thus serve as base points for this process, emitting endless phantasms in an economic fiction of equivalents—derivative products that refer to one another in a superstition of indirect exchange referred to as the economy—to such an extent that we might say these mines can never be refilled. Or, more accurately, they can only be overfilled, stuffed beyond capacity with the carnival of substitutes their hollowing-out has, however inadvertently, unleashed.

[Image: “American Mine (Carlin, Nevada 7, 2007)” by David Maisel].

4.
In 2007, David Maisel began work on a group of photographs called “American Mine,” part of a larger and older series known as “The Mining Project.” These images document, in extraordinary abstract swaths of color, the emergent geometries of mines along the Carlin Trend.

Scattered across Maisel’s images is a forensic survey of cuts and incisions—wounds that will outlive us, scars that won’t go away—older surgeries through which modernity has, in effect, been created. The mines of the Carlin Trend remain unhealed—in fact, year on year, they are growing—a raw scurvy of rocks exposed on a scale so monumental that geologists estimate mines, not cities, will be the final trace of humanity left visible in a hundred million years’ time.

[Image: “American Mine (Carlin, Nevada 17, 2007)” by David Maisel].

Vast terraced bowls step down—and down and, impossibly, further down—tracking dead faults and mineralization fronts on a scale only made clear when we notice 16-ton trucks like specks of dust on canyon walls. Discolored oceans of chemical runoff wash across vehicle tracks with acid tides. Retaining walls and stabilized slopes loom over assembled superscapes of mine detritus, abandoned shells of industrial insects dwarfed by the world they’ve helped create.

In these scenes, geotextile mats have all but replaced the earth’s surface, offering instead a deathless, replicant topography. Artificial hills, each uncannily and exactly like its neighbor, roll from one side of the frame to the other, shifting in tandem with commodities prices, their malleable geography thus forever resistant to mapping. The mines grow and metastasize as voids: storm fronts of negative space exploding with their own slow thunder into the planet.

[Image: “American Mine (Carlin, Nevada 14, 2007)” by David Maisel].

What is of particular interest in Maisel’s “American Mine” series is its revelation of the injuries at the start of the commodity chain: planetary wounds, seemingly beyond the breadth of nature, out of which commodities have been extracted for later exchange.

The production of economically recognizable objects can thus be seen as a kind of terrestrial focusing: out of the chaos of the mine site, with great lakes clouded by geochemical effluent and abstract landforms like ritual mounds from human prehistory, pristine products eventually emerge, assembled from these heavy elements torn so roughly from the ground. Out of the carcinogenic discord of rock dust, circuit boards appear.

In a sense, it is surprising that the computers, phones, batteries, television sets, and other mundane electronics that fill the markets of the world are so free of this fallout, so astringently cleansed of the geological evidence of their own creation. Or perhaps we might say that it is precisely this stripping-away of a product’s elemental birth that gives it its later value and utility. Such products are ironically de-terrestrialized: washed of the very planet from which they came.

• • • 

I owe a huge thank you to David Maisel and editor Alan Rapp for inviting me to participate in the Black Maps book, which is an absolutely gorgeous compendium of Maisel’s work, as well as to Sina Najafi for his editorial feedback before this essay ran in Cabinet Magazine. You can see some photos of Black Maps over at the publisher’s website.

For those of you in Los Angeles, meanwhile, Maisel has a new show opening this spring—on March 26th, 2015—at the Mark Moore Gallery. Check back at this link in the weeks to come for more information.

Finally, if you would like to read some previous posts here on BLDGBLOG about Maisel’s work, don’t miss “The Fall” or “Library of Dust,” among many other short posts; and be sure to read the interview with David Maisel published in The BLDGBLOG Book.

A Cenotaph for Tailings

[Image: From “Mining Cenotaph” by Alexis Quinteros Salazar; courtesy of the RIBA President’s Medals].

Here’s another project from the RIBA President’s Medals, this one by Alexis Quinteros Salazar, a student at the University of Chile in Santiago.

Called “Mining Cenotaph,” it imagines an “occupation” of the tailings piles that have become a toxic urban landmark and a spatial reminder of the region’s economic exploitation.

[Image: From “Mining Cenotaph” by Alexis Quinteros Salazar; courtesy of the RIBA President’s Medals].

A museum would be carved into the tailings; in Salazar’s words, this would be a “building that captures the history and symbolism behind mining, enhancing and revitalizing a memory that is currently disaggregated and ignored and has a very high touristic potential.”

[Image: From “Mining Cenotaph” by Alexis Quinteros Salazar; courtesy of the RIBA President’s Medals].

In an architectural context such as this, the use of the word “cenotaph” is a pretty clear reference to Étienne-Louis Boullée’s classic speculative project, the “Cenotaph for Newton.” Over multiple generations, that has become something of a prime mover in the history of experimental architectural design.

Punctured walls and ceilings bring light into the interior—

[Image: From “Mining Cenotaph” by Alexis Quinteros Salazar; courtesy of the RIBA President’s Medals].

—while the roof is a recreational space for visitors.

Of course, there are a lot of unanswered questions here—including the control of aerosol pollution from the tailings pile itself and that pile’s own long-term structural stability—but the poetic gesture of a public museum grafted into a pile of waste material is worth commending.

[Image: From “Mining Cenotaph” by Alexis Quinteros Salazar; courtesy of the RIBA President’s Medals].

The detail I might like this most is where the structure becomes a kind of inversion of Boullée’s dome, which was pierced to make its huge interior space appear illuminated from above by constellations. Here, instead, it is the perforations in the the rooftop that would glow upward from below, as if in resonance with the night skies high above.

[Image: From “Mining Cenotaph” by Alexis Quinteros Salazar; courtesy of the RIBA President’s Medals].

Salazar’s project brings to mind a few other proposals seen here over the years, including the extraordinary “Memorial to a Buried Village” by Bo Li and Ge Men, as well as Brandon Mosley’s “Mine Plug” (which actually took its name retroactively from that BLDGBLOG post).

Click through to see slightly larger versions of the images over at the RIBA President’s Medals website.

[Image: From “Mining Cenotaph” by Alexis Quinteros Salazar; courtesy of the RIBA President’s Medals].

Finally, don’t miss the Brooklyn food co-op posted earlier, also a recent President’s Medal featured project.

Colossal Cave Adventure

[Photo: “Mega Bike” at the Louisville Mega Cavern; photo courtesy Louisville Mega Cavern].

An underground bike park is opening up next month in a former limestone mine 100 feet beneath Louisville, Kentucky.

At 320,000-square feet, the facility is massive. Outside Magazine explains, “the park will have more than five miles of interconnected trails that range from flowing singletrack to dirt jumps to technical lines with three-foot drops. And that’s just the first of three phases to roll out this winter.”

[Photo: “Mega Bike” at the Louisville Mega Cavern; photo courtesy Louisville Mega Cavern].

That’s from an interview that Outside just posted with the park’s designer, Joe Prisel, discussing things like the challenges of the dirt they’ve had to use during the construction process and the machines they used to sculpt it.

[Photo: “Mega Bike” at the Louisville Mega Cavern; photo courtesy Louisville Mega Cavern].

It’s not the most architecturally-relevant interview, if I’m being honest, so there’s not much to quote here from it, but the very idea of a BMX super-track 10 stories underground in a limestone mine sounds like a project straight out of an architecture student’s summer sketchbook, and it’s cool to see something like this become real.

Caves of Nottingham

[Image: Cliffs and caves of Nottingham; photo by Nicola Twilley].

For several years now, I’ve admired from afar the ambitious laser-scanning subterranean archaeological project of the Nottingham Caves Survey.

Incredibly, there are more than 450 artificial caves excavated from the sandstone beneath the streets and buildings of Nottingham, England—including, legendarily, the old dungeon that once held Robin Hood—and not all of them are known even today, let alone mapped or studied. The city sits atop a labyrinth of human-carved spaces—some of them huge—and it will quite simply never be certain if archaeologists and historians have found them all.

[Images: Laser scans from the Nottingham Caves Survey show Castle Rock and the Mortimer’s Hole tunnel, including, in the bottom image, the Trip to Jerusalem Pub where we met archaeologist David Strange-Walker; images like this imply an exhilarating and almost psychedelic portrait of the city as invisibly connected behind the scenes by an umbilical network of caves and tunnels. Scans courtesy of the Nottingham Caves Survey].

“Even back in Saxon times, Nottingham was known for its caves,” local historian Tony Waltham writes in his helpful guide Sandstone Caves of Nottingham, “though the great majority of those which survive today were cut much more recently.” From malt kilns to pub cellars, “gentlemen’s lounges” to jails, and wells to cisterns, these caves form an almost entirely privately-owned lacework of voids beneath the city.

[Image: Map of only the known caves in Nottingham, and only in Nottingham’s city center; map by Tony Waltham, from Sandstone Caves of Nottingham].

As Waltham explains, “Nottingham has so many caves quite simply because the physical properties of the bedrock sandstone are ideal for its excavation.” The sandstone “is easily excavated with only hand tools, yet will safely stand as an unsupported arch of low profile.”

In a sense, Nottingham is the Cappadocia of the British Isles.

[Image: The extraordinary caves at 8 Castle Gate; scan courtesy of the Nottingham Caves Survey].

The purpose of the Nottingham Caves Survey, as their website explains, is “to assess the archaeological importance of Nottingham’s caves. Some are currently scheduled monuments and are of great local and national importance. Some are pub cellars and may seem less vital to the history of the City.”

Others, I was soon to learn, have been bricked off, taken apart, filled in, or forgotten.

“All caves that can be physically accessed will be surveyed with a 3D laser scanner,” the Survey adds, “producing a full measured record of the caves in three dimensions. This ‘point cloud’ of millions of individual survey points can be cut and sliced into plans and sections, ‘flown through’ in short videos, and examined in great detail on the web.”


[Video: One of very many laser-scan animations from the Nottingham Caves Survey].

While over in England a few weeks ago, I got in touch with archaeologist David Strange-Walker, the project’s manager, and arranged for a visit up to Nottingham to learn more about the project. Best of all, David very generously organized an entire day’s worth of explorations, going down into many of the city’s underground spaces in person with David himself as our guide. Joining me on the trip north from London was Nicola Twilley of Edible Geography; architect Mark Smout of Smout Allen and co-author of the fantastic Pamphlet Architecture installment, Augmented Landscapes; and Mark’s young son, Ellis.

[Image: Artificially enlarged pores in the sandstone; photo by BLDGBLOG].

We met the very likable and energetic David—who was dressed for a full day of activity, complete with a well-weathered backpack that we’d later learn contained hard hats and floodlights for each of us—outside Nottingham’s Trip to Jerusalem pub.

Rather than kicking off our visit with a pint, however, we simply walked inside to see how the pub had been partially built—that is, expanded through deliberate excavation—into the sandstone cliffside.

The building is thus more like a facade wrapped around and disguising the artificial caves behind it; walking in past the bar, for instance, you soon notice ventilation shafts and strange half-stairways, curved walls and unpredictable acoustics, as the “network of caves” that actually constitutes the pub interior begins to reveal itself.

[Image: A laser scan showing the umbilical connection of Mortimer’s Hole, courtesy of the Nottingham Caves Survey].

My mind was already somewhat blown by this, though it was just the barest indication of extraordinary spatial experiences yet to come.

[Image: Examining sandstone with Dr. David Strange-Walker; photo by BLDGBLOG].

Wasting no time, we headed back outside, where afternoon rain showers had begun to blow in, and David introduced us to the sandstone cliff itself, pointing out both natural and artificially enlarged pores pockmarking the outside.

The sandstone formations or “rock units” beneath the city, as Tony Waltham explains, “were formed as flash flood sediments in desert basins during Triassic times, about 240 million years ago, when Britain was part of a hot and dry continental interior close to the equator. Subsequent eons of plate tectonic movements have brought Britain to its present position; and during the same time, the desert sediments have been buried, compressed and cemented to form moderately strong sedimentary rocks.”

The city is thus built atop a kind of frozen Sahara, deep into which we were about to go walking.

[Image: A gate in the cliff; photo by BLDGBLOG].

Outside here in the cliff face, small openings led within to medieval tunnels and stairs—including the infamous Mortimer’s Hole—that themselves curled up to the top of the plateau; doors in the rock further up from the Trip to Jerusalem opened onto what were now private shooting ranges, of all things; and, with a laugh, David pointed out shotcrete cosmetic work that had been applied to the outer stone surface.

[Image: Artificial shotcrete geology; photo by BLDGBLOG].

We headed from there—walking a brisk pace uphill into the town center—with David casually narrating the various basements, cellars, tunnels, and other urban perforations that lay under the buildings around us, as if we were traveling through town with a human x-ray machine for whom the city was an archaeologically rich cobweb of underground loops and dead-ends.

We soon ended up at the old jails of the Galleries of Justice. A well-known tourist destination, complete with costumed re-enactors, the building sits atop several levels of artificial caves that are well worth exploring.

[Image: Scan of the Guildhall caves, courtesy of the Nottingham Caves Survey].

We were joined at this point by the site’s director, who generously took time out of his schedule to lead us down into parts of the underground complex that are not normally open to the general public.

Heading downward—at first by elevator—we eventually unlocked a door, stepped into a tiny room beneath even the jail cells, crouching over so as not to bang our heads on the low ceiling, and we leaned against banded brick pillars that had been added to help support all the architecture groaning above us.

Avoiding each other’s flashlight beams, we listened as our two guides talked about the discovery—and, sadly, the willful reburial—of caves throughout central Nottingham.

[Image: Brick pillars below Nottingham; photo by BLDGBLOG].

We learned, for instance, that, elsewhere in the city, there had once been a vacuum shop with a cave beneath it; if I remember this story correctly, the shop’s owners had the habit of simply discarding broken and unsold vacuum cleaners into the cave, inadvertently creating a kind of museum of obsolete vacuum parts. Discontinued models sat in the darkness—a void full of vacuums—as the shop went out of business.

We heard, as well, about a nearby site where caves had been discovered beneath a bank during a recent process of renovation and expansion—but, fearing discovery of anything that might slow down the bank’s architectural plans, the caves were simply walled up and left unexplored. They’re thus still down there, underneath and behind the bank, their contents unknown, their extent unmapped—a fate, it seems, shared by many of the caves of Nottingham.

Rather than being greeted by the subterranean and historical wonder that such structures deserve—and I would argue that essentially all of subterranean Nottingham should be declared a UNESCO World Heritage Site—the caves are too often treated as little more than annoying construction setbacks or anomalous ground conditions, suitable only for bricking up, filling with concrete, or forgetting. If the public thinks about them at all, in seems, it is only long enough to consider them threats to building safety or negative influences on property value.

[Images: Learning about caves; photos by BLDGBLOG].

In any case, on our way out of the Galleries of Justice, we lifted up a ventilation grill in the floor and looked down into a small vertical shaft, too narrow and contorted even for Ellis to navigate, and we learned that there are urban legends that this particular shaft leads down to a larger room in which Robin Hood himself was once held… But we had only enough time to shine our flashlights down and wonder.

[Images: Ellis Smout looks for Robin Hood below; photos by BLDGBLOG].

From here, we headed over to our final tourist-y site of the day, which is the awesomely surreal City of Caves exhibition, located in Nottingham’s Broad Marsh shopping mall.

You literally take an escalator down into an indoor mall, where, amidst clothing outlets and food courts, there is an otherwise totally mundane sign pointing simply to “Caves.”

If you didn’t know about Nottingham’s extensive sub-city, this would surely be one of the most inexplicable way-finding messages in mall history.

[Image: Caves; photo by Nicola Twilley].

Here, where we picked our copy of Tony Waltham’s Sandstone Caves of Nottingham pamphlet, from which I’ve been quoting, we learned quite a bit more about how the city has grown, how the caves themselves have often been uncovered (for example, during building expansions and renovations), and what role Nottingham’s underground spaces served during the Nazi bombings of WWII.

[Image: Beneath Broad Marsh shopping mall; photo by BLDGBLOG].

The specific underground complex beneath the shopping mall offers an interesting mix of old tanning operations and other semi-industrial, pre-modern work rooms, now overlapping with 20th-century living and basement spaces that were sliced open during the construction of the Broad Marsh mall.

[Images: Cave spaces beneath the Superstudio-like concrete grid of Nottingham’s Broad Marsh shopping Mall].

That these caves were preserved at all is testament to the power of local conservationists, as the historically rich and spatially intricate rooms and corridors would have been gutted and erased entirely during post-War reconstruction without their intervention.

As it now stands, the mall is perched above the caves on concrete pillars, with the effect that curious shoppers can wander down into the caves through an entrance that could just as easily lead to a local branch of Accessorize.

[Image: A well bucket in the caves beneath Broad Marsh; photo by BLDGBLOG].

Again, we were fortunate to be taken down into some off-limits areas, stepping over lights and electric wires and peering ahead into larger rooms not on the tourist route.

[Images: Lines of lights we switched on in one of the off-limits rooms below Broad Marsh; photo by BLDGBLOG].

This included stepping outside at one point to wander through an overgrown alleyway behind the mall. Small openings even back here stretched beneath and seemingly into the backs of shops; one doorway, a short scramble up a hill of weed-covered rubble, appeared to contain a half-collapsed spiral staircase installed inside a brick-lined sandstone opening.

[Image: A doorway to voids behind Broad Marsh Centre; photo by BLDGBLOG].

At this point, we began to joke about the ease with which it seemed you could plan a sort of speleological super-heist, breaking into shops from below, as an entire dimension of the city seemed to lie unwatched and unprotected.

Nottingham, it appeared, is a city of nothing but doors and openings, holes, pores, and connections, complexly layered knots of space coiling beneath one building after another, sometimes cutting all the way down to the water table.

Incredibly, the day only continued to build in interest, reaching near-impossible urban sights, from catacombs in the local graveyard to a mind-bending sand mine that whirled and looped around like smoke rings beneath an otherwise quiet residential neighborhood.

Leaving the mall behind, and maintaining a brisk pace, David took us further into the city, where our next stop was the Old Angel Inn, another pub with an extensive cellar of caves, in this case accessed through a deceptively workaday door next to an arcade game.

[Images: The Old Angel Inn (top), including the door inside the pub that leads down to the caves below; photos by Nicola Twilley].

Once again, it can hardly be exaggerated how easy it would be to visit or even live in Nottingham and have absolutely no idea that underground spaces such as this can be found almost anywhere. As Tony Waltham points out, “It would be a fair assumption that every building or site within the old city limits either has or had some form of cave beneath it. About 500 caves are now known, and this may be only half the total number that have been excavated under Nottingham.”

[Images: The caves of the Old Angel Inn, courtesy of the Nottingham Caves Survey].

In any case, “Although the Old Angel is a ‘modern’ brick building,” as the Nottingham Caves Survey describes the pub on its website, “an investigation of the caves below reveals stone walls belonging to an earlier incarnation. It is likely that there were buildings on this site as far back as the Anglo-Saxon period. Whether the caves beneath are also this old cannot be demonstrated definitively.”

Typical, as well, for these types of pub caves, we found ventilation and delivery tunnels leading back up to the surface, and the walls themselves are lined with long benches, perfect for sitting below ground and, provided you have candles or a flashlight along with you, enjoying a smoke and a pint of beer. As Tony Waltham explains, pub cellars often include “perimeter thralls,” or “low ledges cut in the rock,” normally used for storing kegs and barrels of beer but quite easily repurposed for a quick sit-down.

But I sense I’m going on way too long about all this, especially because the two most memorable details of the entire day were yet to come.

Jumping forward a bit, we left the Old Angel and followed some twists and turns in the street to find ourselves standing outside a nightclub called Propaganda.

Here, David revealed that he has been working on what, in my opinion, will easily be one of the must-have apps of the year. In a nutshell, David has managed to make the subterranean 3D laser-scans of the Nottingham Caves Survey accessible by location, such that, holding up his iPod Touch, he demonstrated that you could, in effect, scan the courtyard we were standing in to see the caves, tunnels, stairways, cellars, vents, storage rooms, and more that lay hidden in the ground around us.

[Images: We test-drive the cave-spotting app; bottom photo by Nicola Twilley].

Ideally, once the Survey’s extensive catalog of 3D visualizations and laser point-clouds has been made available and the app is ready for public download, you will be able to walk through the city of Nottingham, smartphone in hand, revealing in all of their serpentine complexity the underground spaces of the city core.

For anyone who has ever dreamt of putting on x-ray glasses and using them to explore architectural space, this app promises to be a thrilling and vertiginous way to experience exactly that—peering right through the city to see its most ancient foundations.


[Video: A fly-through of the Propaganda Nightclub malting caves].

I, for one, can’t wait to see what David and the Nottingham Caves Survey do with the finished application and I eagerly await its public availability.

[Image: Mark Smout looks for caves in the sky; photo by Nicola Twilley].

I’ll wind up this already quite long post with just a few more highlights.

Nottingham’s Rock Cemetery, north from the center of town along the Mansfield Road, contains, among other things, the collapsed remains of a sand mine. Three of the mine’s old entrances are now gated alcoves surrounded by graves, like something out of Dante. They “are the only surviving remnants of the mine,” Waltham writes in his pamphlet.

[Images: Nottingham’s Rock Cemetery, where archaeologist David Strange-Walker explained the history of the local landscape].

However, an ambitious plan to carve sizable catacombs, inspired by Paris and Rome, through the sandstone beds of the ancient desert here resulted in the never-completed Catacomb Caves, “probably done in 1859-63,” Waltham suggests. These long arched tunnels, accessible through one of the gates described above, eventually lead to a radial terminus from which branch the unused proto-catacombs.

The air there is cloudy with sand—leading me, several days later, to experience a brief attack of hypochondria, worried about developing silicosis—the walls are graffiti’d, and years of trash are piled on the sides of the sandy floor (which has since taken on the characteristics of a dune sea in places, as 150 years of footfall and a collapsing ceiling have led to the appearance of drifts).

[Images: The Rock Cemetery catacomb gates].

What was so extraordinary here, among many other things, was that, for most of this walk through the catacombs, we were actually walking below the graves, meaning that people were buried above us in the earth. At the risk of overdoing it, this felt not unlike becoming aware of an altogether different type of constellation, with bodies and all the stories their lives could tell held above us in a terrestrial sky like legends and heroes, like Orion and Cassiopeia, as we looked up at the vaulted ceiling, flashlights in hand.

[Image: Inside the catacombs; photo by Nicola Twilley].

But the best site of all was next.

[Image: A door on the street—the black door with bars—leading down into a sand mine; photo by BLDGBLOG].

Serving as something of the ultimate proof that Nottingham is a city of overlooked doors that lead into the underworld, there were two locked doors—one of which (the black door, near the sidewalk) appears in the photo, above, another of which, on a street nearby, leads down into the Peel Street Caves—simply sitting there on the sidewalk that, if opened, will take you down into extensive and now defunct sand mines. David’s laser-scans of these for the Nottingham Caves Survey are absolutely gorgeous, as you can see, below.

[Image: The Peel Street Caves sand mine, courtesy of the Nottingham Caves Survey].

For a variety of reasons, I am going to avoid being too specific about some of the details here, but, aside from that, I can only enthuse about the experience of donning our hard hats and heading down several flights of comparatively new concrete steps into a coiling and vast artificial cavern from the 19th century, one we spent nearly an hour exploring.

[Image: Nicola Twilley and Mark Smout head down into the sand mine; photo by BLDGBLOG].

Getting lost down there would be so absurdly easy that it is frightening even to contemplate, and, in case the group of us somehow got split up or our batteries ran out of juice, we joked about—if only we could remember them—the easy techniques for navigating a labyrinth offered in Umberto Eco’s novel The Name of the Rose.

[Image: Many of these way-finding signs are actually incorrect, David explained, and seem to have been painted as a kind of sick joke by someone several years ago; photos by BLDGBLOG].

Avoiding such a fate, however, we found graffiti and men’s and women’s latrines; we popped our heads through holes allowing glimpse of other levels; and we cracked our helmets loudly against the low and rough roof more times than I could count.

[Images: Inside the sand mine; all photos by Nicola Twilley].

And even that doesn’t complete the day. From here, heading back out onto the street through a nondescript steel door, as if we had been doing nothing more than watching football in someone’s basement, we went on to eat pie and chips in a restaurant built partially into a cave; we walked back across town, returning to where we started, talking about the future and seemingly obvious possibility of Nottingham’s caves being declared a UNESCO World Heritage Site and thus saved from their all but inevitable destruction (it’s easy to imagine a future in which a tour like the one David gave us will be impossible for lack of caves to see); and we all said goodbye beneath an evening sky cleared of clouds as a late-day breeze began to cut through town.

[Image: Mark & Ellis Smout explore our final “underground” space of the day, the magnificent Park Tunnel; the banded strata clearly visible in the walls show how the tunnel was carved through the dunes of an ancient desert. Photo by BLDGBLOG].

David proved to be a heroic guide that day. His energy never flagged throughout the tour, and he never once appeared impatient with or exhausted by any of our often ridiculous questions—not to mention our tourists’ insistence on pausing every three or four steps to take photographs—and he remained always willing to stay underground far longer than he had originally planned, all this despite having never met any of us before in person and only communicating with me briefly via a flurry of emails the week before.

Meeting David left me far more convinced than I already was that the Nottingham Caves Survey fully deserves the financial support of individuals and institutions, so that it can complete its ambitious and historically valuable work of cataloging Nottingham’s underground spaces and making that knowledge freely accessible to the general public.

Weirdly, England has within its very heart a region deserving comparison to Turkish Cappadocia—yet very few people even seem to know that this subterranean world exists. There very well could be more than 1,000 artificial caves beneath the city, many of them fantastically elaborate, complete with fine carvings of lions and ornate stairwells, and it is actually somewhat disconcerting to think that people remain so globally unaware of Nottingham’s underground heritage.

With any luck, the work of David Strange-Walker, Trent & Peak Archaeology, and the Nottingham Caves Survey will help bring this extraordinary region of the earth the attention—and, importantly, the focused conservation—it is due.

(For further reading, don’t miss Nicola Twilley’s write-up of the tour on her own blog, Edible Geography; and Tony Waltham’s Sandstone Caves of Nottingham, cited extensively in this post, is worth a read if you can find a copy).

The town at risk from cave-ins

In what sounds like the plot of a bad horror film, we read that “kids in Picher, Okla., are exposed to lead, and the ground is at risk of cave-ins” due to the “abandoned mines beneath the city.”

Turns out the whole town is now under “voluntary buyout” by the US government because the place is so polluted that no one should be living there. Tailings from abandoned lead and zinc mines are to blame; indeed, there are “giant gray piles of mining waste, known locally as ‘chat,’ some hundreds of feet tall and acres wide, that loom over abandoned storefronts and empty lots.”

[Image: “Chat piles” looming round the “abandoned storefronts and empty lots” of Picher, OK; photo by Matt Wright, author of the article I’ve been quoting. See also this photo gallery from the US Geological Survey’s own tour of Picher, or this series of images from 1919].

From the Washington Post:

Signs of Picher’s impending death are everywhere. Many stores along Highway 69, the town’s main street, are empty, their windows coated with a layer of grime, virtually concealing the abandoned merchandise still on display. Trucks traveling along the highway are diverted around Picher for fear that the hollowed-out mines under the town would cause the streets to collapse under the weight of big rigs. (!) In some neighborhoods, empty mobile homes sit rusting in the sun, their windows broken, their doors yawning open, the detritus of life—car parts, broken toys, pieces of carpet, rotting sofas—strewn across their front yards.

But what happens in twenty years’ time, when a group of joy-riding teenagers from across state lines find themselves driving through Picher in the late afternoon…? They park their car, laughing, and throw rocks through some windows; one of them sneaks behind the old neighborhood Piggly Wiggly and opens up the door of a small shed only to find the entrance to a mine—when, suddenly, the ground opens up on the main street and swallows all three of his friends.

He hears screaming—as well as what sound like whispering voices coming from beneath the ground. The sun setting, our naive hero of the high school football squad descends into the lead mines to find them…

Or has that film already been made?

(Thanks, Javier! See also Helltown USA and Cancer Villages).