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. 58-59.-58, 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 



