Ten years ago, this would have been a speculative design project by Sascha Pohflepp: “hyper-accumulating” plants are being used to concentrate, and thus “mine,” valuable metals from soil.
[Image: Nickel-rich sap; photo by Antony van der Ent, courtesy New York Times.]
“With roots that act practically like magnets, these organisms—about 700 are known—flourish in metal-rich soils that make hundreds of thousands of other plant species flee or die,” the New York Times reported last week. “Slicing open one of these trees or running the leaves of its bush cousin through a peanut press produces a sap that oozes a neon blue-green. This ‘juice’ is actually one-quarter nickel, far more concentrated than the ore feeding the world’s nickel smelters.”
A while back, I went on a road-trip with Edible Geography to visit some maple syrup farms north of where we lived at the time, in New York City. The woods all around us were tubed together in a huge, tree-spanning network—“forest hydraulics,” as Edible Geography phrased it at the time—as the trees’ valuable liquid slowly flowed toward a pumping station in the center of the forest.
It was part labyrinth, part spiderweb, a kind of semi-automated tree-machine at odds with the image of nature with which most maple syrup is sold.


[Images: Photos by BLDGBLOG.]
Imagining a similar landscape, but one designed as a kind of botanical mine—a forest accumulator, metallurgical druidry—is incredible.
And it’s not even a modern idea, as the New York Times points out. For all its apparent, 21st-century sci-fi, the idea of harvesting metal from plants is at least half a millennium old: “The father of modern mineral smelting, Georgius Agricola, saw this potential 500 years ago. He smelted plants in his free time. If you knew what to look for in a leaf, he wrote in the 16th century, you could deduce which metals lay in the ground below.”
This brings to mind an older post here about detection landscapes, or landscapes—yards, meadows, gardens, forests—deliberately planted with species that can indicate what is in the soil beneath them.
In the specific case of that post, this had archaeological value, allowing researchers to find abandoned Viking settlements in Greenland based on slight chemical changes that have affected which plants are able to thrive. Certain patches of flower, for example, act as archaeological indicator species, marking the locations of lost settlements.
In any case, my point is simply that vegetation can be read, or treated as a sign to be interpreted, whether by indicating the presence of archaeological ruins or by revealing the potential market-value of a site’s subterranean metal content.
Indeed, we read, “This vegetation could be the world’s most efficient, solar-powered mineral smelters,” with “the additional value of enabling areas with toxic soils to be made productive. Smallholding farmers could grow on metal-rich soils, and mining companies might use these plants to clean up their former mines and waste and even collect some revenue.” That is, you could filter and clean contaminated soils by drawing heavy-metal pollutants out of the ground, producing saps that are later harvested.
Fast-forward ten years: it’s 2030 and landscape architecture studios around the world are filled with speculative metal-harvesting plant designs—contaminated landscapes laced with gardens of hardy, sap-producing trees—even as industrial behemoths, like Rio Tinto and Barrick Gold, are breeding proprietary tree species in top-secret labs, genetically modifying them to maximize metal uptake.
Weird saps accumulate in iridescent lagoons. Autumn leaves glint, literally metallic, in the sun. Tiny metal capillaries weave up the trunks of black-wooded trees, in filigrees of gold and silver. The occasional forest fire smells not of smoke, but of copper and tin. Reclaimed timber, with knots and veins partially metallized, is used as luxury flooring in suburban homes.
Read more at the New York Times.
(Thanks to Wayne Chambliss for the tip!)
[Image: From “
[Image: Betelgeuse, before dimming; photo by ESO, M. Montargès et al, via
[Image: Betelgeuse, during dimming; photo by ESO, M. Montargès et al, via 
[Image: Binnewater Kilns, photo by BLDGBLOG.]
[Image: The Rosendale Trestle, photo by BLDGBLOG.]

[Image: Caves everywhere! Photos by BLDGBLOG.]
[Image: An entrance to the Widow Jane Mine; photo by BLDGBLOG.]


[Image: Inside the Widow Jane Mine; photos by BLDGBLOG.]
[Image: Flooding inside the Widow Jane Mine; photo by BLDGBLOG.]
[Image: Lawn chairs facing the black waters of a flooded mine; photo by BLDGBLOG.]
[Image: A creepy, ruined house in the woods, photo by BLDGBLOG.]
[Image: Cement world; photos by BLDGBLOG.]
[Image: “Born to Die”—it’s hard to argue with that, although when I texted this photo to a friend he thought it said “Born to Pie,” which I suppose is even better. Photo by BLDGBLOG.]
[Image: Photos by BLDGBLOG.]
[Image: “Minimal Republic nº3, Area: 100 m², Border: square, 10m side, defined with rope tied to pickaxes around a square of crushed rye, Population: 1 inhabitant, Location: 41.298691º, -3.400101º, Start: July 30, 2015, 19:15, End: July 31, 2015, 11:38,” from Minimal Republics by
[Image: “Minimal Republic nº2, Area: 100 m², Population: 1 inhabitant, Border: equilateral triangle, side 15.19 m made of wooden slats assembled, Location: 40.039637º, -5.1146942º, Start: July 23, 2015, 12:21, End: July 23, 2015, 21:48,” from Minimal Republics by
[Image: “Minimal Republic nº8, Area: 100 m2, Border: circle of 5.64 m radius of stacked stubble, Population: 1 inhabitant, Location: 41.4152292, -3.3632866, Start: September 8, 2017, 18:41, End: September 9, 2017, 18:40,” from Minimal Republics by
[Image: An engraving of mining, from Diderot’s
[Image: From the
[Image: From
[Image: A map of the
[Image: A map of the
[Image:
[Image: Still from the end of
[Image: “
[Image: “
[Image: “