Mining Engineers' Handbook, Volume 2Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 21-26
... Example 11. Copper Mining Costs Table 39. Miscellaneous Group ; Production and Costs , 1912 Mine Tons of ore milled Yield per ton lb Cu Total pounds of Cents per lb of copper Oper- Gold , copper produced ating silver Sundry credit Net ...
... Example 11. Copper Mining Costs Table 39. Miscellaneous Group ; Production and Costs , 1912 Mine Tons of ore milled Yield per ton lb Cu Total pounds of Cents per lb of copper Oper- Gold , copper produced ating silver Sundry credit Net ...
Halaman 21-32
... Example 20 ) . " Indicated cost of copper " . 12. 135 per lb of copper 12.400 ¢ 0.265 ¢ 40 46 " 14 Note : These figures show the great advantage Canadian copper producers have over competitors , because of the by - product metals ...
... Example 20 ) . " Indicated cost of copper " . 12. 135 per lb of copper 12.400 ¢ 0.265 ¢ 40 46 " 14 Note : These figures show the great advantage Canadian copper producers have over competitors , because of the by - product metals ...
Halaman 21-33
... Example 21. Iron Mining in Michigan Table 55. A Five - year Summary from Records of All Iron Mines Operating in ... Examples of these costs are EXAMPLES OF COSTS 21-33.
... Example 21. Iron Mining in Michigan Table 55. A Five - year Summary from Records of All Iron Mines Operating in ... Examples of these costs are EXAMPLES OF COSTS 21-33.
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COMPRESSED | 15 |
Applications Definitions Data | 15-44 |
Accident Compensation Pensions | 16-1 |
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adjustment Aerial Tramway anthracite approx assay aver borax buckets Bur Mines capac carriers cars charge chute claim coal mines compressor concentrate conveyer copper cost crusher crushing cu ft cupel cyanide deflection diam discharge distance drill dust elev engineer explosions feed filter fire firedamp gold hoisting horiz intercooler labor lamp less litharge loaders loading lode long ton machine material mechanical metal method mill mineral motor operation pipe plant plate plumb-bob pump pyrite rock safety lamps sample screen shaft sheave short ton side silver sizes Sodium carbonate solution speed station steel stopes surface survey Table tape telescope temp tension tests timber tion tons Total towers track cable traction rope tramway Trans transit traverse underground usually vein vertical wire zinc