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 15
... profit- able but a safer field for investment than any other of our leading industries . In no other department of ... profits in the future . Many of the mineral developments made of late have been enormous , and successful Never has ...
... profit- able but a safer field for investment than any other of our leading industries . In no other department of ... profits in the future . Many of the mineral developments made of late have been enormous , and successful Never has ...
Halaman 18
... profit in all is considered . One step in advance would be , taking more care . There is too much slashing about in our gold mining . There is enough in silver , but no comparison between the work- ing of the two metals . This plan of ...
... profit in all is considered . One step in advance would be , taking more care . There is too much slashing about in our gold mining . There is enough in silver , but no comparison between the work- ing of the two metals . This plan of ...
Halaman 20
... profit margin is being steadily enlarged in mining operations even while working a lower grade of material ; much auriferous gravel being now washed and ore milled with satisfactory gains that would not a few years ago have paid ...
... profit margin is being steadily enlarged in mining operations even while working a lower grade of material ; much auriferous gravel being now washed and ore milled with satisfactory gains that would not a few years ago have paid ...
Halaman 22
... profit , with- out a large expenditure first incurred in fitting them up with the requi- site apparatus and supplying them with water . With these furnished , they can still be worked with remunerative results , and very often with ...
... profit , with- out a large expenditure first incurred in fitting them up with the requi- site apparatus and supplying them with water . With these furnished , they can still be worked with remunerative results , and very often with ...
Halaman 25
... profit . Among what may justly be ranked as new discoveries is a description of gold - bearing deposits denominated " Seam Diggings , " and which , ac- cording to a statement recently published in the Commercial Herald , have been ...
... profit . Among what may justly be ranked as new discoveries is a description of gold - bearing deposits denominated " Seam Diggings , " and which , ac- cording to a statement recently published in the Commercial Herald , have been ...
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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