. Transactions. rea. The mining of asbestos is carried on by quarrying. As the fissuresor seams are small it naturally follows that a great deal of dead matterhas to be moved. The serpentine carries on the average from threeto four per cent of asbestos, and rarely does it reach as high as six percent. Dynamite is used as the explosive, and is put into 10 to 12 feetdeep drill holes. In out-of-the way places the hand drill is still used,otherwise steam or compressed air is utilized. The broken rock isreduced to smaller pieces by means of heavy sledges and steel wedges,»and then smaller hammers a
. Transactions. rea. The mining of asbestos is carried on by quarrying. As the fissuresor seams are small it naturally follows that a great deal of dead matterhas to be moved. The serpentine carries on the average from threeto four per cent of asbestos, and rarely does it reach as high as six percent. Dynamite is used as the explosive, and is put into 10 to 12 feetdeep drill holes. In out-of-the way places the hand drill is still used,otherwise steam or compressed air is utilized. The broken rock isreduced to smaller pieces by means of heavy sledges and steel wedges,»and then smaller hammers are used for separating the asl)estos fromthe ganguo. The latter work is done either in the quarry, or undercover when a purer asbestos is desired. For this work boys from 14 to16 years of age are employed. As magnetic iron ore is sometimesfound in the asbestos, particular attention must be paid that the fibresare not unnecessarily damaged in separating the mineral. This treat- 352 The Canadian Mining Asbestos and its Production in Canada. 353
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