. The sampling and estimation of ore in a mine . ved and lay with their longer axis parallelto the cleavage of the slate; the body at D E only lastedas far as two sets of timber; that of F G died out at 60ft., and that at B C petered out at 40 ft. above thelevel, while the last one, H K, went up as a narrow bodyfor a distance of 160 ft. Compare Fig. 11 with Fig. 12 —69— SAMPLING AND ESTIMATION OF ORK IN A MINE and quote Hamlets comment on his own portrayal ofhis mothers successive husbands. This incident did notbefall a tyro, but an old campaigner who was caughtby his own carelessness under ci
. The sampling and estimation of ore in a mine . ved and lay with their longer axis parallelto the cleavage of the slate; the body at D E only lastedas far as two sets of timber; that of F G died out at 60ft., and that at B C petered out at 40 ft. above thelevel, while the last one, H K, went up as a narrow bodyfor a distance of 160 ft. Compare Fig. 11 with Fig. 12 —69— SAMPLING AND ESTIMATION OF ORK IN A MINE and quote Hamlets comment on his own portrayal ofhis mothers successive husbands. This incident did notbefall a tyro, but an old campaigner who was caughtby his own carelessness under circumstances from whichonly the greatest wariness could have saved him. Misconceptions concerning the conditions contribu-tory to the localization of ore-shoots and the conse-quent mistaken ideas as to the future possibilities of amine have often arisen from a misunderstanding of veinintersections. In the case of a well-known mine in south-western Colorado a length of 2,700 ft. of ore had beenopened up by an upper level and stopes, which had. Jwinze58Ft. Deqp J Winze H3 Ft. Deep mstoped , ^^ LoNCilTUDIXAL SECTION FiG. 13 0 lUO 200 worked out most of the ore except at one end, and hadproved that it persisted to the surface, an average dis-tance of 150 ft. above this upper level. In the mean-time two winzes had demonstrated the apparent down-ward continuance of the ore-body. A longitudinal sec-tion of these workings is shown in Fig. 13. In the ex-amination of the mine by several distinguished miningengineers, it was assumed that the winzes, one of whichwas 58 ft. and the other 143 ft. deep, proved the con-tinuity of the ore-body to an extent sufficient to warranta price for the property which was a good deal in ex-cess of the net profits to be won from the ground asmeasured to the bottom of the winzes. In the sequelit was found, after the mine had been purchased, andwhen deeper workings had explored the lower horizon,that the ore-body owed its existence, and certainly itsshape
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Keywords: ., bo, bookcentury1900, bookdecade1900, booksubjectores, bookyear1907
