Transactions . lue. A further reduction of afew costs is possible. After repeating calculations for the \ew , the writer intends to reconsider this level and will com-pare the cost per ton with SO feet .stalls, to the older .system ofdriving the gates, giving 40 feet stalls. District Dates of Survey Planimetersq. inches Total No. of tons DufTin Diat. 5% waste 1 TotiJOoalExtrmcted A 9/11/07 22/ 1/08 29/ 7/08 19/ 2 1/ 4/09 7/ 7/09 A-B B-C C-D D-E E-F 4 wj. in. . . sq. 8q. . sq. 8,666 8,000 12,800 3. (HIT 1,446
Transactions . lue. A further reduction of afew costs is possible. After repeating calculations for the \ew , the writer intends to reconsider this level and will com-pare the cost per ton with SO feet .stalls, to the older .system ofdriving the gates, giving 40 feet stalls. District Dates of Survey Planimetersq. inches Total No. of tons DufTin Diat. 5% waste 1 TotiJOoalExtrmcted A 9/11/07 22/ 1/08 29/ 7/08 19/ 2 1/ 4/09 7/ 7/09 A-B B-C C-D D-E E-F 4 wj. in. . . sq. 8q. . sq. 8,666 8,000 12,800 3. (HIT 1,446 7,09610,644 24,073 I^ength of Lenjftli Bniflhinfi; Lcn^h Length ! Rruj«hinK District GutewHvs [)or 100 |)cr ton of (iate- per 100 prr ton .\ ••A A wav•U j H A-B 675 0 31c. 470 1 0 29c. B-C 1,150 750 7 1 0 21c. C-D 2,000 1,625 6 9 0 32c. D-E 5(K) 3 5 0 33c. 475 3 5 0 31c. E-F 625 5 5 0 26c. 625 1 0 26c. 6oO LoNGWALL Mining and Emery Pit—Burland. Screens and Picking Tables, Dominion No. —Gates spaced for 40 ft. stalls on —Gates spaced for 80 ft. stalls on face. To derive an average standard for A, and B, the writer takestotal gateways in case A at 4,950 feet, abandoned gates 1,450 feet,or 3,500 feet of gateways requiring back ,500 feet at SO. 00 = $21 000. 001,450 feet at $ = $ 2, 4,950 feet = $23, 1ft. = 23,010 ^ 4950 = $ Thus 675 feet of gateways at average of $4. 80 = $ perton. An exception to the above rule is made in this case and thestandard lowered to $ owing to the greater percentage ofabandoned gaUiS. The standard used in Lower North is sub-stituted in this instance. i LoNGWALL Mining and Emery Pit—Blrland 651 The New Landing works were driven to the riije from the leveland so continued. The level was driven for 800 feet and a driftwas started away meeting the second left-hand cross-gate offNo. 5 Long North. There are four working gates relieving thenume
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Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1895
