. Bulletin - United States National Museum. Science. 250 BULLETIN 131, UNITED STATES NATIONAL MUSEUM ten years after the other big mines—the Standard-Mammoth, Morn- ing (including You Like), Last Chance, and the several mines of the Bunker Hill group—had begun deep workings in sulphide ores. Although the chief operations by the big mining companies were deep developments, leases granted in the old surface tunnels and stopes continued to produce carbonate ore and to furnish some good ceru- site crystals intermittently down to the close of the war in 1918. Fine cerusite was produced by the McBri
. Bulletin - United States National Museum. Science. 250 BULLETIN 131, UNITED STATES NATIONAL MUSEUM ten years after the other big mines—the Standard-Mammoth, Morn- ing (including You Like), Last Chance, and the several mines of the Bunker Hill group—had begun deep workings in sulphide ores. Although the chief operations by the big mining companies were deep developments, leases granted in the old surface tunnels and stopes continued to produce carbonate ore and to furnish some good ceru- site crystals intermittently down to the close of the war in 1918. Fine cerusite was produced by the McBride lease on the Tyler mine. 58 59 Figs. , Cerusite; butterfly twin. Sierra Nevada mine, Shoshone County. 59, Ceru- site. Twinned on m(llO). Caledonia mine, Wardner, Shoshone County in 1912-1914 and during this period the Last Chance was mining above the No. 1 level and encountered some well crystallized mate- rial. The Sierra Nevada, on Deadwood Gulch, an dd flat vein in which the ore, mined out in the early days of the district, was all oxidized, was reopened about this time by Drew Peeples, who re- worked some of the old rejected material in the stopes and mined out some pillars of rich ore. Some exceedingly fine crystallized cerusite was found during these operations. In what was called the "square. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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