Daily Arizona silver belt., 1910-02-06
Seven Hundred Feet Under ground Work Being Done
 . Every Month
TUNNEL DRIVEN TO
 EXTRACT THE ORES
Will Be Mined by the Popu- lar "Glory Hole"
 Method

The development work at the Inspi. ration Copper company $ property, is be- ing carried on in the usual energetic manner anr the preparations for the pro duction of ore are much in evidence at various points. Over seven hundred feet of underground work is being done each month in drifts, raises and tunnels and large part of this is blocking out the ore body already developed
 A tunnel from Keystone Guleh, nearly 1000 feet southwest of the main ore body, is being driven, however, to fur msh a cheap means of extracting the ore. The extraction tunnel will be con tinued from it's present length to the ore body extending few hundred feet southwest of the Joe Bush shaft. and from this point the ore win be mined northward and westward to the Scor. pion shaft and southward to the western limit of the ore body which is over 1000 feet southeast of the latter shaft. The drills are still at work in the block of ground south of this and ewest of the Joe Bush shaft, and as the ore de. vcloped by the drills and underground workings appears to form a huge block it is likely that the entire body will be mined by the "glory hole" method similar to that employed at the Nam. moth copper mine in norther Calofornia and that other mines having similar de- pOsts to this one. As the overburden is too great to be stoped from the ore. the ore can be more cheaply mined by stOping and carrying from the upper portion of the deposit to the level of the extraction tunnel, the overburden be. ing supported by timbering, while the ore lying immediately underneath is be. ing extracted and lowered through winzes tO the tunnel where the ore ears are loaded from ehutes. While this system requires many timbers, the great saving in labor makes the cost of production low and the rate of extrae- .tion rapid. The hard granite.porphyry in which the tunnel work is being done makes the advance slow, but as good headway is being made as can be ex. pected by means of hand drilling and in short time the large compressor will be in use at this tunnel and the work will be thus greatly facilitated. The concrete foundation for this compress sor is already set and the 100-horsepow- CT boilers, two in number, will also be installed within the next week or so, as the building and foundations for these have been practically finished. With force of 160 men employed, the work of installing the machinery and advancing the underground develop men work is being rushed. A new 60- horsepower hoist is being installed at the Joe Bush shaft, and with this in commission, sinking may be resumed to greater depth. Living accommodations at the Inspiration camp are being ex- banded to afford shelter and board for the increased working force and this work will be continued until the diff cutly in finding suitable accommoda- tions for employees is wholly eliminated. The camp has already assumed an ap- pearance similar to that of the other foremost mines of Globe district, and should eventually compare favorably in this respect with any of these.