Statistics of Mines and Mining in the States and Territories West of the Rocky Mountains: Being the [1st-8th] Annual Report of Rossiter W. Raymond, U.S. Commissioner of Mining StatisticsU.S. Government Printing Office, 1873 |
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Seite 18
... lead and slag basins out- side of the furnaces . The difficulty was overcome by inserting iron ket- tles into the excavation necessary for the metal - basin , and by using iron pots to remove the slag . The mines which have furnished ...
... lead and slag basins out- side of the furnaces . The difficulty was overcome by inserting iron ket- tles into the excavation necessary for the metal - basin , and by using iron pots to remove the slag . The mines which have furnished ...
Seite 19
... lead , when lying in a ferruginous gangue , it is not often seen on as large a scale as exposed in the Union . The carbonate - ores of the Union , on account of their friability termed " fuse - ores " by the miners , average , as ...
... lead , when lying in a ferruginous gangue , it is not often seen on as large a scale as exposed in the Union . The carbonate - ores of the Union , on account of their friability termed " fuse - ores " by the miners , average , as ...
Seite 20
... lead , apparently increasing in width toward the bottom . We have also drifted 180 feet on the level of the tunnel ... lead . Then I stopped that furnace and started the other , and have con- tinued to produce bullion at about the same ...
... lead , apparently increasing in width toward the bottom . We have also drifted 180 feet on the level of the tunnel ... lead . Then I stopped that furnace and started the other , and have con- tinued to produce bullion at about the same ...
Seite 21
... lead , the richness of which is not stated . From the works at Swansea there were removed 620 tons of lead , car- rying from $ 120 to $ 340 of silver per ton . A small part of the latter was even much richer . To judge from former ...
... lead , the richness of which is not stated . From the works at Swansea there were removed 620 tons of lead , car- rying from $ 120 to $ 340 of silver per ton . A small part of the latter was even much richer . To judge from former ...
Seite 32
... lead , with a small quantity of zinc - blende . Samples of this ore assay from $ 60 to $ 140 per ton in gold and silver . This discovery , made in December , 1872 , I believe , will probably lead to much prospect- ing in the spring of ...
... lead , with a small quantity of zinc - blende . Samples of this ore assay from $ 60 to $ 140 per ton in gold and silver . This discovery , made in December , 1872 , I believe , will probably lead to much prospect- ing in the spring of ...
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50 feet amalgam amount assay average base bullion bed-rock bottom buddle bullion California Cañon carbonate carried cent channel claim Clear Creek County coal company's contains copper cost County Creek crushing deposit depth developed diameter district ditch drift east Eureka expenses feet deep feet long feet wide flume furnace galena Gilpin County grade granite gravel ground Gulch Hill hoisting-works hydraulic hydraulic mining inches incline iron lead ledge length limestone located lode miles mill miners Mining Company Mount Gregory Mountain nearly Nevada opened operations ore-body ounces particles pipe Pliocene portion pounds present prospecting quantity quartz quicksilver railroad rich River rock San Francisco sand shaft Sierra Sierra County Sierra Nevada slag sluice-boxes sluices smelting smelting-works specific gravity square miles stamps stopes stream sulphurets sunk surface tailings tion tons Total tunnel tuyeres Valley vein washed width yield