. Steam shovel mining, including a consideration of electric shovels and other power excavators in open-pit mining . 4 in. X 3M in.—40 per cent 30 3 Hercules IH in. X IH in. Red H — 7 Hercules 40 per cent (l^i in. X 4 in., mostly) — 4 Gelatin and semi-gelatin 60 per cent 2 — Red Cross 40 per cent 2 —. Fig. .32.—Drill-hole being sprung. It will be noted that the black powder has been displacedby the more efficient Trojan powder. Experiments carried 10 146 STEAM SHOVEL MINING out using Trojan 40 per cent. vs. Hercules 40 per cent, indicatedthat the breakage per pound of Hercules was higher than
. Steam shovel mining, including a consideration of electric shovels and other power excavators in open-pit mining . 4 in. X 3M in.—40 per cent 30 3 Hercules IH in. X IH in. Red H — 7 Hercules 40 per cent (l^i in. X 4 in., mostly) — 4 Gelatin and semi-gelatin 60 per cent 2 — Red Cross 40 per cent 2 —. Fig. .32.—Drill-hole being sprung. It will be noted that the black powder has been displacedby the more efficient Trojan powder. Experiments carried 10 146 STEAM SHOVEL MINING out using Trojan 40 per cent. vs. Hercules 40 per cent, indicatedthat the breakage per pound of Hercules was higher than theTrojan; that the cost per pound of the Trojan was less; that thecost per yard of material broken was about the same in bothcases; that the Trojan worked well in cold weather, requiring nothawing, and was held in consequence to be more convenientand safer to handle. About lb. of powder were required per cu. yd. of materialbroken, including explosives used in dobying boulders. Varied and interesting experience in the loading and shootingof well-drill holes has been given by S. R. Russell C. E.^ Some of the following brief records of blasts in different sec-tions of the country are quoted from him. An average of 4 to 6tons of stone per pound of explosive is about what should beexpected i
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