Mineral Resources of the States and Territories West of the Rocky Mountains ..., Том 6U.S. Government Printing Office, 1874 |
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Страница 421
... cupellation - furnace , supplied with blast by a No. 3 Sturtevant blower , which is run by a small steam - en- gine having a vertical tubular boiler , and an assay - office , in which there are two wind- furnaces , of the ordinary ...
... cupellation - furnace , supplied with blast by a No. 3 Sturtevant blower , which is run by a small steam - en- gine having a vertical tubular boiler , and an assay - office , in which there are two wind- furnaces , of the ordinary ...
Страница 427
... cupellation - furnace without injuring it . This retort - bullion assays between 2,000 and 3,000 ounces in silver per ton of 2,000 pounds , depending , of course , on the richness of the ore worked . After the retort has been emptied of ...
... cupellation - furnace without injuring it . This retort - bullion assays between 2,000 and 3,000 ounces in silver per ton of 2,000 pounds , depending , of course , on the richness of the ore worked . After the retort has been emptied of ...
Страница 428
... CUPELLATION . The cupellation furnace at the works at South Lynne is a small one , of the English pattern , having one tuyere , supplied with blast by a No. 3 Sturtevant blower . The blower is run by a small steam - engine that has a ...
... CUPELLATION . The cupellation furnace at the works at South Lynne is a small one , of the English pattern , having one tuyere , supplied with blast by a No. 3 Sturtevant blower . The blower is run by a small steam - engine that has a ...
Страница 429
... cupellation - furnace are melted over again in graphite crucibles in the wind - furnaces of the laboratory , with addition of a little quartz - sand and borax , which gives the silver a brighter appearance and also frees it from any ...
... cupellation - furnace are melted over again in graphite crucibles in the wind - furnaces of the laboratory , with addition of a little quartz - sand and borax , which gives the silver a brighter appearance and also frees it from any ...
Страница 433
... CUPELLATION OF SILVER - LEAD . The furnaces are English , with blast below the fire - grate , and on lead bath ; the fuel used is Briar Hill soft coal . The tests are made of ground limestone aud fire - clay , in the proportion of 3 to ...
... CUPELLATION OF SILVER - LEAD . The furnaces are English , with blast below the fire - grate , and on lead bath ; the fuel used is Briar Hill soft coal . The tests are made of ground limestone aud fire - clay , in the proportion of 3 to ...
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30 feet Amador County amount antimony assay average base bullion bed-rock bottom California Cañon carried cent centner charge chloride cinnabar claim Clear Creek County coal company's containing copper cost County Creek cross-cut crushed cupellation Deer Lodge deposits depth developed district ditch drift east estimated Eureka expenses extracted feet deep feet long feet wide flasks flume furnace galena gold gravel ground Gulch Hill hydraulic Idria inches iron labor Lautenthal lead-matte ledge limestone litharge located lode matte metal miles mill miners Mining Company Mountain Nevada Nevada County obtained opened operations ore-body ounces oxides porphyry pounds profit prospecting quantity quartz quicksilver refining reverberatory reverberatory furnace rich River roasting rock San Francisco shaft shipped silver slag slate smelting smelting-works stamps steam sulphurets sunk supply surface tailings thick tons Total tunnel tuyeres Valley vein washing width yield zinc