Silver and Gold: an Account of the Mining and Metallurgical Industry of the United States: With Reference Chiefly to the Precious MetalsJ.B. Ford, 1873 - 566 halaman |
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Halaman 9
... estimated bullion product will be found in the appendix . The nature of the increase it exhibits is still more gratifying than its amount , since it shows clearly that the decline of production from superficial mining INTRODUCTION . 9.
... estimated bullion product will be found in the appendix . The nature of the increase it exhibits is still more gratifying than its amount , since it shows clearly that the decline of production from superficial mining INTRODUCTION . 9.
Halaman 13
... estimated at 154,000 square miles . The State is divided into forty - nine counties , and in twenty - four of these counties mining is carried on to a greater or less extent . The principal mining region lies on the western slope of the ...
... estimated at 154,000 square miles . The State is divided into forty - nine counties , and in twenty - four of these counties mining is carried on to a greater or less extent . The principal mining region lies on the western slope of the ...
Halaman 14
... estimated area of ground ( in acres ) now being worked , and the extent of the aurif- erous deposits ; an estimate of the yield of hydraulic ground , per cubic yard ; and a statement of the yield and expense of milling per cubic yard ...
... estimated area of ground ( in acres ) now being worked , and the extent of the aurif- erous deposits ; an estimate of the yield of hydraulic ground , per cubic yard ; and a statement of the yield and expense of milling per cubic yard ...
Halaman 17
... estimated that 576,000 gallons of this " muddy water " flowed by every 24 hours , which , according to these tests , contain $ 339.84 . Let us carry this calculation a little further . The average amount of ore worked in 24 hours was ...
... estimated that 576,000 gallons of this " muddy water " flowed by every 24 hours , which , according to these tests , contain $ 339.84 . Let us carry this calculation a little further . The average amount of ore worked in 24 hours was ...
Halaman 21
... estimated as ranging between fifteen and twenty millions of dol- lars . Many of these investments have been made with care , and are likely to prove both safe and profitable . In purchasing properties of this kind much circumspection ...
... estimated as ranging between fifteen and twenty millions of dol- lars . Many of these investments have been made with care , and are likely to prove both safe and profitable . In purchasing properties of this kind much circumspection ...
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50 feet amalgam amount antimony arrastra assay average Bannack base bullion bed-rock bullion Calaveras County California CaƱon carbonate cent chemical claim coal commenced company's contains copper cost County course Creek Cupellation December deposits depth developed district ditch drift drill east El Dorado County engine erected Eureka expense extracted feet deep feet in length feet long feet wide furnace galena gangue gold Gold Hill gravel ground Gulch Hill hundred hydraulic inches incline iron labor lead ledge limestone located lode metal metallurgy miles mill miners Mining Company months nearly Nevada opened operations ounces owners placer mines pounds present Professor prospecting quantity quartz quartzite rich River rock San Francisco silver slag slate smelting smelting-works stamps stopes sulphurets sunk supply surface Table Mountain tailings thick tion tons Total tunnel Tuolumne County tuyeres Valley vein width yield