This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 Excerpt: ...at a depth of 200 to 250 feet the richest bodies of chalcocite, partly oxidized to cuprite, are found (figs. 10 and 11). In the Arizona Central and Williams veins the croppings contained malachite and azurite, forming payable ore. Lower down chalcocitc appeared, but it is partly oxidized down to the greatest depth ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 Excerpt: ...at a depth of 200 to 250 feet the richest bodies of chalcocite, partly oxidized to cuprite, are found (figs. 10 and 11). In the Arizona Central and Williams veins the croppings contained malachite and azurite, forming payable ore. Lower down chalcocitc appeared, but it is partly oxidized down to the greatest depth attained, 300 feet, and there is no sharply defined line between the two zones (fig. 18). The Fairplay vein also contained some payable oxidized ore near the surface, but at a depth of 100 feet changed into chalcocite. Croppings of poor chrysocolla ore mark the north-south vein at the Liverpool tunnel on the north side of Copper Mountain, and these, ISO feet lower, are replaced by a vein of massive chalcocite 1 or '2 feet wide. The Copper Mountain system, consisting of the Wellington, Ryerson, Humboldt, and West Yankie veins, have barren and almost unrecognizable croppings in porphyry, but develop copper carbonate where cutting through limestone. The surface croppings show very small amounts of limonite and the pyrite is wholly oxidized. A short distance below the surface, however, pyrite appears, seamed and surrounded by rusty limonite and efflorescences. Veinlets of blue copper sulphate are very common. At a depth from the surface of 100 to 200 feet (the latter below the summit of Copper Mountain) chalcocite begins to appear and the limonite ceases altogether. The chalcocite seems to be almost wholly transformed to soluble sulphate, as does also the pyrite. There is practically no payable ore containing malachite, chrysocolla, brochantite, etc. From the preceding it seems clear that the surface zone is not due to direct oxidation of the primary vein, but rather entirely to the oxidation of the chalcocite zone. This confirms results reached elsew...
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