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MINING AND MINE METHODS.
<br />The main opening, is the O'Neil shaft, 4 x 8 in the
<br />clear, 2 compartments, bucket and ladder vray, 878 ft, deep,
<br />The shaft dips to the S, E, ~2 ft, in the first 3O0 ft „ belovr
<br />which, it straightens up to the bottom, The shaft is timbered
<br />with atolls, and square sets; provided with a good bucket
<br />road, skids being 4 x 4's, lagged, and ladder road, with
<br />occasional landings,
<br />The collar of the shaft is located 250 ft, S, i:r, of the
<br />N.E. end line of the O'Neil lade, and. is provided vrith gates
<br />on two sides, the third side being closed by automatic door,
<br />vrhile the 4th side is left open. The shaft has the following
<br />levels running from it:-
<br />200 ft, level, Ext,N,E. S,!+r,
<br />269 „ „ „
<br />'u58 „ „ S,1^I, 582 ft. connecting with tun,
<br />464 „
<br />566
<br />666 „
<br />766 „
<br />866 „ .,
<br />Hoisting is done by bucket, attached to a 7~8 in,.
<br />Roebling steel cable, attached to socket and safety chain, same
<br />being changed last September, !7eig~ht of load hoisted, 2500 lbs„
<br />distance hoisted, 86G ft, NOT];. The bucket, an reaching the
<br />surface, engages an arm, which controls an automatic mrrangement
<br />1'or olasing• the door of the shaft, thereby malring it impossible
<br />for anything to fall dovrn the shaft, a:Pter bucket has reached
<br />surface, The shaft is in eharg~e oi' a trammer, vrho employe
<br />the Colorado signal codo, the signals being given either by a
<br />bell rope, attached to 8 in. gong, or. by an electric bell line
<br />attached to g'ong's, and employing i;he Perine circuit breakers.
<br />All signals, ors given both to engineer and top man, there being
<br />gangs at collar of shaft and in engine room. A7.1 the level
<br />stations are provided with passage-ways around shaft.
<br />The method of ore extraction, is that of overhand stoping,
<br />using 3, Z 1n., and 2, 2-1~4 in, Sullivan Air llr.ills, 100i~
<br />uir pressure, 3 in. air line in shaft, 1-1~21n. and 2 1n. air
<br />lino in levels, and single and double hand drilling.
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