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
... continued to act as my deputy , and whose thorough scientific training and wide experience of American as well as European mining and metallurgy have been of the greatest assistance in my work . We were both in the field during a part ...
... continued to act as my deputy , and whose thorough scientific training and wide experience of American as well as European mining and metallurgy have been of the greatest assistance in my work . We were both in the field during a part ...
Halaman 21
... continued and even largely in- creased in the future . Our mines have also of late grown much in favor with home investors , it having become evident to all that we cannot longer neglect their de- velopment if we expect to enjoy a rapid ...
... continued and even largely in- creased in the future . Our mines have also of late grown much in favor with home investors , it having become evident to all that we cannot longer neglect their de- velopment if we expect to enjoy a rapid ...
Halaman 28
... continued in the field until driven out by the inclemency of the season , having reached a point as far south as Sutter Creek , Amador County . In the prosecution of this work a large amount of valuable information has already been ...
... continued in the field until driven out by the inclemency of the season , having reached a point as far south as Sutter Creek , Amador County . In the prosecution of this work a large amount of valuable information has already been ...
Halaman 48
... continued diminution . On the other hand , the demand for this metal is increasing . Should the Stockton and Copperopolis Railroad be completed to Cop- peropolis , it is believed that with present prices of labor ( $ 2 to $ 3 per day ) ...
... continued diminution . On the other hand , the demand for this metal is increasing . Should the Stockton and Copperopolis Railroad be completed to Cop- peropolis , it is believed that with present prices of labor ( $ 2 to $ 3 per day ) ...
Halaman 53
... continued up to the top of the ditch and is made four or five feet in thickness , then an inner wall two feet wide and two feet distant from the outer one is built four feet high from the bottom of the ditch ; clay is then tamped ...
... continued up to the top of the ditch and is made four or five feet in thickness , then an inner wall two feet wide and two feet distant from the outer one is built four feet high from the bottom of the ditch ; clay is then tamped ...
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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