A company called Mountain Copper established a 4,400-acre mine in the 1890s and began to supply sulfuric acid to refineries in the Bay Area. It became the largest copper mine in California by the turn of the century, and a small city of laborers lived on the mountain. Twenty cavities the size of office buildings were drilled into the rock.
The mining operation turned to rubble what was originally a 200-foot-thick by 3,000-foot-long underground deposit of pyrite, the metallic mineral known as fool's gold. The destruction of the mountain exposed the pyrite to oxygen, water and bacteria that combined to create poisonous runoff.
The result was the worst concentration of acid in the world, about 500 times more toxic than any other mine.
Let Prohm's Posse Ride: Hallice, Brady, Stu, Lard, Naz, Deonte, Monte, Matt, Simeon, Jordan, and Babb.
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