. Mining and Scientific Press . JM ID-FRAME SHOWING Tilt. IBBANGEMENT OK DUMPING VICES \M> CHI Tl - livan DP-33 air-tube rotator drill were used during the course of the month; an average of five machines was inoperation each day. Eollow hexagonal drill steel. , with a double-taper bit, was used The fact that we were able to perform a complete cycle,ling shoveling, hoisting, and timbering eachslljit instead of every 24 hours, as is the usual custom,added appreciably to the daily footage. We have foundthr> rounds each day to be more efficient than one or two longer ones. The
. Mining and Scientific Press . JM ID-FRAME SHOWING Tilt. IBBANGEMENT OK DUMPING VICES \M> CHI Tl - livan DP-33 air-tube rotator drill were used during the course of the month; an average of five machines was inoperation each day. Eollow hexagonal drill steel. , with a double-taper bit, was used The fact that we were able to perform a complete cycle,ling shoveling, hoisting, and timbering eachslljit instead of every 24 hours, as is the usual custom,added appreciably to the daily footage. We have foundthr> rounds each day to be more efficient than one or two longer ones. The accomplishment of the 750 MINING AND SCIENTIFIC PRESS Nov. mber 2ti 1021 Iped materially by the co-operation and en-couragement given by the officials of the Chief Con-solidated Mining Co. J. D. Matheson, general foreman,ami Benry Jarvis, shaft-foreman, deserve greal credit;. DETAIL OF DEVICE FOR DUMPING BUCKETS it was through their efforts and skilful supervision thatthe results were made possible. The following table summarizes the details of therecord-breaking operations: Distance sunk, feet 427 % Period, days 31 Size of buckets, cubic feet 17 Powder used per foot, pounds iKe advance per day. feet Buckets hoisted per shift Sets of timber per day Timbermen per day Shaftmen per shift Holes drilled per round Hounds per day Delay In 3 1-day period on account of repairs and power failures, hours <;U lit-fining produced from mines in general is associated with of which are present in the ore. dut ing the process* s of extraction and ? is include copper, lead, bismuth, impurities include • platin ; other members of the platinum is objecl the removal A Mining and EngineeringJournal. Of these, for they often have an injurious effee! on thephysical properties of the gold, rendering it unsuitableIm- coinage
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