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<br />MINING qND MINE METHODS. ~'
<br /> The main opening ie an ad it, or tunnel, the mouth
<br /> of whioh is located on Sur.No,8580, Ango Millsite, in
<br /> the easterly end of the City of Idaho Springs, having a
<br /> course of N, 14 degrees and 44 minutes M., extending into
<br /> Seaton and Pewabic mountaina,a distance of .13400 ft. to
<br /> breast, which at the present time is being driven, to con-
<br /> nect with, or cut the Saratoga are bodies.
<br /> Size of tunnel 9 x 10 ft, in clear, far the first
<br /> 13150 ft „ thence 6 x 9 ft, to breast.
<br /> The tunnel is being driven for drainage and
<br /> transporation purposes, cutting• numerous veins, among
<br /> which may be mentioned the Gem, at a distance of 7750 ft,
<br /> the Sun & Pdoon, at a distance of ft. from the mouth of
<br /> the tunnel,
<br /> The tunnel is being driven by two, 3 in, water T~eynert~
<br /> on oolumna, which consume one shift oi' 8 hours, to put
<br /> in a round of 19 holes, the other two shifts being talcen
<br /> up by powder,and mucking gangs, an average progress of 8 ft,
<br />1-1~8 in. per day being made in the tunnel.
<br />se, name The method of timbering omployed is the atull and
<br /> tunnel set, the mouth of the tunnel being• timbered with
<br />covered sawed pine, while the other portions are timbered with the
<br />~ ft. S. ~, oft ordinary pine timber, prepared by hand.
<br />'der kept in The underground tramming is effected by electrio
<br /> haulage, employing a 6,000~~ (2) 8 N. P, I4otora, eleotric
<br />wing drvioe, looomotive; 3b cubic ft. steel oars, 35~ rail, 18 in, gauge.
<br />at water The care ors dumped automatioally, by a Knawlea rotary
<br />powder is dumper, located on dump at ore bins, same having a capacity
<br /> of 5 oars,
<br /> The tunnel is double traoked, for the first 13,400 ft,
<br /> NOTE,
<br /> A ourrent of 460 volts is used by a looomotive.
<br />c
<br />A natural system of drainage 1a employed, using a
<br />water box, 1 x 2 ft, rnnning between the traoka.
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