California mines and minerals . mpo Seco Mine was discovered in1860, and an immense body of ore developed, the ledge showingtwenty-eight feet in width at the 200-foot level. The Satellite, another of the same group, was even richer thanthe Campo Seco, the gold and silver in the ore paying all the expensesof mining and treatment. A furnace and chemical plant were erectedat a large expense, and for a time the proceeds were most satisfac- 332 CALIFORNIA MINES AND MINERALS tory. The ores are sulphides and carbonates, and possess peculiarlycorrosive properties. In 1892, operations were suspended an
California mines and minerals . mpo Seco Mine was discovered in1860, and an immense body of ore developed, the ledge showingtwenty-eight feet in width at the 200-foot level. The Satellite, another of the same group, was even richer thanthe Campo Seco, the gold and silver in the ore paying all the expensesof mining and treatment. A furnace and chemical plant were erectedat a large expense, and for a time the proceeds were most satisfac- 332 CALIFORNIA MINES AND MINERALS tory. The ores are sulphides and carbonates, and possess peculiarlycorrosive properties. In 1892, operations were suspended and haveonly just been resumed this year (1899). A new and improved forty-ton water-jacket furnace has been erected, and the properties areagain in full blast. At Copperopolis, near the southern boundary of the county, is theUnion-Keystone Copper Mine, at one time the largest copper producerin the State. It was closed down a number of years ago when the priceof copper declined, and, aside from a leaching of the old ore piles, has.
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