Book Description

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1872 edition. Excerpt: ... Indirect cost of pumping at the 16 mines now being worked, including wear of machinery and additions, $3,000 per month '--$456,000. "Wages of 3,000 miners, at $4 per day, $12,000 (a) 4,380,000 Consumption of timber, 16,000,000 feet per annum, $25 (6). 400,000 Cost of milling 365,000 tons of ore, $10.50 (c)-3,838,800 Loss by present method of reduction, 35 per cent. on $23,000,000, assay value (d)-8,050,000 Total $18,891,151 Cost of working by the Sutro tunnel. Taking the commissioners' figures, (e) and adding what they left out. Lowering 365,600 tons pay ore, at 10 cents---$36560 Transportation of same, average of 5 miles, ' 50 cents--182,800 Transportation of 3,000 miners, at 20 cents, $600 per day 210,000 Eoyalty on 365,000 tons, at $2 731,000 To this should be added: Lowering 365,600 tons waste, at 10 cents (/)--36,560 Transportation of the same, 5 miles, 50 cents (g) -..., .. 182,800 Wages 2,250 miners, at $4=$9,000 per day-. 3,285,000 (it. B. 2,250 miners, with the thermometer at 70, will do as much work as 3,000 at 90. Capacity increased 25 per cent.) (h) Consumption of timber per annum, 8,000,000 (a) See Test., pp. 72,74, 172, 173, 392, 393, 394, 395,627,699, 700, 703, 704. (6) See Test., pp. 37, 38, 70, 71, 369. (c) See Test., pp. 58,157,158. (d) See Test., pp. 159,160, 256, '311, 354, 630, 631, 632, 706, 707, 708, 754. (e) See Commissioners' Report, p. 10. (/) See Test., pp. 20, 24, 25, 202, 620, 621, 622. See Test., pp. 20, 21,22, 24, 26, 202, 457, 458, 663, 704, 705. See Test., pp. 72, 74,172,173,392, 393, 394, 395, 627,699,700, 703, 704. feet, $25, (8,000,000 saved by good ventilation (a)---$200,000 Cost of milling at mouth of tunnel 365,600 tons, at $5 (b)..+. 1,828,000 Loss at mouth of tunnel in reducing and...