Statistics of Mines and Mining in the States and Territories West of the Rocky Mountains: Being the ... Annual Report, 1. izdajaU.S. Government Printing Office, 1870 |
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Stran 32
... tion as one of the most successful quartz mining counties . Not alone have the mines , already well known by their almost unexampled yield of gold during the past , maintained their production , but also com- paratively new , or at ...
... tion as one of the most successful quartz mining counties . Not alone have the mines , already well known by their almost unexampled yield of gold during the past , maintained their production , but also com- paratively new , or at ...
Stran 44
... tion is not practiced in battery , but the quartz is crushed to such a fineness as to per- mit of its passage through the finest screens , and thence over blankets , which are washed out every fifteen minutes . The results of the ...
... tion is not practiced in battery , but the quartz is crushed to such a fineness as to per- mit of its passage through the finest screens , and thence over blankets , which are washed out every fifteen minutes . The results of the ...
Stran 50
... It is these fine particles that he saves . In their rich rock , their gold being coarser , they save a greater propor- tion of it . Return of the production of gold in the Grass Valley 50 MINES AND MINING WEST OF THE ROCKY MOUNTAINS .
... It is these fine particles that he saves . In their rich rock , their gold being coarser , they save a greater propor- tion of it . Return of the production of gold in the Grass Valley 50 MINES AND MINING WEST OF THE ROCKY MOUNTAINS .
Stran 60
... tion vary from eight to twenty feet . The pay - ore or productive zone of the ledges varies also from two and a half to fifteen feet , and is found sometimes on the foot - wall , sometimes on the hanging - wall , and often , where the ...
... tion vary from eight to twenty feet . The pay - ore or productive zone of the ledges varies also from two and a half to fifteen feet , and is found sometimes on the foot - wall , sometimes on the hanging - wall , and often , where the ...
Stran 69
... tion desired in the shape of the following general remarks . The work now being prosecuted is merely washing off the upper or top strata to a depth , in many places , of one hundred and forty feet . This brings the miners down to the ...
... tion desired in the shape of the following general remarks . The work now being prosecuted is merely washing off the upper or top strata to a depth , in many places , of one hundred and forty feet . This brings the miners down to the ...
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Alpine County amalgamation amount apparatus arrastras assay average Bannack battery bottom bullion California Cañon Cañon City cents chloride claims coal Comstock lode contains copper cost country rock County Creek crushing cylinder deposits depth diameter ditch dollars drift drill east engine explosion extension feet deep feet wide fissure five furnace galena giant powder gold granite Grass Valley gravel Gulch hoisting hole horse-power hundred feet inches iron iron pyrites July labor ledge length lode machine metal metres miles mill miners Mining Company mining district Mountains Nevada opened operations owners patent Pinos Altos piston placer mining pounds pump pyrites quantity quartz quicksilver railroad Reese River reported rich roasting rock running shaft side silver slate smelting stamps steam sulphurets surface Territory tion tons Treasure Hill trepan tunnel Valley valve vein vertical weight White Pine width yield
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Stran 426 - That as a further condition of sale, in the absence of necessary legislation by Congress, the local Legislature of any State or Territory may provide rules for working mines involving easements, drainage, and other necessary means to their complete development ; and those conditions shall be fully expressed in the patent.
Stran 327 - Gold in the Sweetwater district was first discovered in 1842 by a Georgian, who came here with the American Fur Company for the recovery of his health. After remaining a year he started for home, intending to organize a company and bring them to work the mines.
Stran 675 - The quantity of water used per stamphead in crushing varies from 720 gallons to 11,520 gallons per diem of 24 hours. The quantity of mercury used in the ripples per stamper is from 5 to 70 pounds.
Stran 328 - ... some time. When winter approached they abandoned their enterprise to winter at Fort Laramie, where they intended to provision themselves for a year and get a supply of necessary tools in the spring. This done they started, but when on their way two days they were overtaken by United States dragoons and brought back to the fort. The leader was sent to prison for some imaginary offense and the property of the entire company confiscated.
Stran 662 - The proper form of the curvature of the cam is a modified involute of a circle, the radius of which is equal to the horizontal distance between the axis of the cam-shaft and the centre of the stamp-stem. The curvature should be increased or made greater than the regular involute, at each end of the cam.
Stran 259 - ... are excluded from the preemption act of 1841, and which under past legislation are not liable to ordinary private entry, it shall and may be lawful for the President to cause such tracts, in suitable legal subdivisions, to be offered at public sale to the highest bidder, after public notice of not less than three months, at a minimum price of twenty dollars per acre ; and any lands not thus disposed of shall thereafter be liable to private entry at said minimum.
Stran 150 - ... from minute inquiries made of several individuals who were concerned in letting off the water, and of several gentlemen who were present at the legal investigation which it occasioned, I possessed myself of the following facts. Long Lake, before it...
Stran 513 - Om.20 ; and it gives 200 blows per minute. This machine is single-acting. The compressed air enters by the opening in constant communication by the conduit with the front part of the cylinder ; when the piston is at the end of the stroke...
Stran 649 - ... jaws at the bottom limits the size of the fragments. This distance, and consequently the size of the fragments, may be regulated at pleasure. A variation to the extent of five-eighths of an inch may be made by turning the screw-nut P, which raises or lowers the wedge Q, and moves the toggle-block R forward or back.
Stran 409 - Spaniards in the mean time not having turned their attention to mining pursuits for a series of years), succeeding generations were never able to discover them again. Indeed it is now generally credited by the Spanish population. that the Pueblo Indians, up to the present day, are acquainted with the locales of a great number of these wonderful mines, of which they most sedulously preserve the secret.