MINEBK00428

• County: TOC
• Document: TOC
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Mine Inspector`s Report on The Emma Gold Mining Company Group
September 8, 1913
SURFACE PLANT
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The surface plant consists of 2 boilers, 1-25 H.P., 1-150 H.P. One steam
hoisting engine 75 H.P. This is stationed about 100 feet from entrance of
tunnel in a frame building 30 x 60 x 40 with iron roof. One 16 drill air com-
pressor. All the above not in use just at present.
There is a blacksmith shop and office about 400 feet from lower or main tunnel.
EXPLOSIVES
40% giant powder, imported in solid Z.L. fuse and 5-x caps, wooden tamping bars
are used. Explosives in excess of one day's supply are not stored underground.
The average amount of explosives kept in storage is 1000 pounds. This is kept in
a log house with a dirt roof 300 feet from any buildings or tunnel and used for
this purpose only. Oils, candles and other combustibles are stored in the mill
store room. This mine is very warm; do not need any artificial powder thawer.
MINING AND MINE METHODS
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The main opening is a tunnel on the vein 3300 feet long, this is the lower
tunnel. There are three more tunnels above this, 100 feet apart. They are all
connected by raises and atopes. Number 4 level is 2800 feet long. Number 3
level is 2500 feet long and Number 2 level is 2800 feet Long. Number 3 level is
where work is carried on at present. Eoth drifting and stoping. All the ore is
dumped down to Number 5 level and then trammed to mill. The method of ore
extraction is overhand stoping and drifting by hand drills, some double and some
single hand.
The method of timbering le stulls and square seta covered with lagging. The
timbers are pine prepared by hand and are sufficient to secure safety. Under-
ground tramming is done by hand and mules. Steel care are used for tramming.
Chutes are loaded by hand and gravity. Tho system of ventilation iacondltlone
All old timbers have been removed from underground and the sanitary
are good. Candles are used for lighting underground. All levels are connected
by manways with four exits. The ladders in manways are in good shape and ready
at all times for employees.
STATISTICS
Avesage tonnage per month: 150
Total number of feet 1n shafts: 165
Total number of feet in upraises: 43
Total number of feet in drifts and levels:
Total number of feet in crosscuts: 404
Cost of powder per pound: $20.00
Cost of fuel per ton: $5.00
Cast: $25.00 per foot
Cost: $15.00 per foot
10,400 Coat: $9.00 per foot
Cost: $10.00 per foot
Cost of transporting ors to railroad: $5.50 per ton
Cost of milling: $1.50 per ton
Cost of mining: $3.00 per ton
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