Silver and Gold: An Account of the Mining and Metallurgical Industries of the United States |
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النتائج 11-15 من 93
الصفحة 76
... mill has been increased six tons a day by the use of this contrivance , besides saving much expense for labor . The mill now runs about fifty - five tons per day , and the yield of the quartz is from $ 6 to $ 20 per ton , with a ...
... mill has been increased six tons a day by the use of this contrivance , besides saving much expense for labor . The mill now runs about fifty - five tons per day , and the yield of the quartz is from $ 6 to $ 20 per ton , with a ...
الصفحة 79
... mill at Rich Gulch Flat , which they intend removing to their mine as soon as practicable . The battery consists of 15 stamps , a 35 horse - power engine furnishing the motive power . A crushing in their mill has yielded $ 2,263 for 60 ...
... mill at Rich Gulch Flat , which they intend removing to their mine as soon as practicable . The battery consists of 15 stamps , a 35 horse - power engine furnishing the motive power . A crushing in their mill has yielded $ 2,263 for 60 ...
الصفحة 86
... mills to remain idle for several months , have been the main hinderances of a satisfactory return to all parties directly interested . I would recommend the erection of a first - class 60 - stamp mill at an early day , in order that we ...
... mills to remain idle for several months , have been the main hinderances of a satisfactory return to all parties directly interested . I would recommend the erection of a first - class 60 - stamp mill at an early day , in order that we ...
الصفحة 87
... mill is in good running condition . The water - wheel , which is old , has been repaired , and will , with occasional slight repairs , run this winter . The Rose mill has been repaired , and is running well . The Badger has also been ...
... mill is in good running condition . The water - wheel , which is old , has been repaired , and will , with occasional slight repairs , run this winter . The Rose mill has been repaired , and is running well . The Badger has also been ...
الصفحة 88
... mill of its caliber . Drifting was commenced on the 800 feet level in the latter part of 1871. On the 700 feet level the drifts have been run 400 feet on either side of the shaft . Two pay chutes or chimneys run through this location ...
... mill of its caliber . Drifting was commenced on the 800 feet level in the latter part of 1871. On the 700 feet level the drifts have been run 400 feet on either side of the shaft . Two pay chutes or chimneys run through this location ...
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50 feet amalgam amount antimony arrastra assay average Bannack base bullion bed-rock bullion Calaveras County California Cañon 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 metallurgy metals 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