MINEBK00494

• County: San Juan
• Volume: 14
• Document: Inspectr
• Suffix: A

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Ilie s;~ Engineer. Surface transportation is done by Pack train.
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-°! ~ E%PLOSI VES.
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!JL 40° Dupont, German fuse and wooden tamping bars are used. +
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'~-• All excess powder is stored in a Magazine several hundred
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feet from other buildings. About one ton Ss stored there-
in. Device for• thawing powder is a double hot water boiler.
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'' l1L I N I& G A P D Z: I N E M E T H O D S.
The r.,ain opening is a Tunnel. ":ork is carried ..n at the
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present time 300 feet from surface. yfen are not raised
~ or lowered r•ith hoi:,tir_
g machinery. Averahe weight
heieted 60G lbs. P.iatance hoisted 700 foot. Tho cable is
ir. mood c-,ndit.ion being replaced about two .months ago,
A bucket hook is used on end of cable. This is about
two months old, Gtate code is used in sigr:aling. Theae
are posted near collar of shaft. All persons are pruhibited
from riding on loaded cage. All level stations are provic:-
ed v:ith passage nay around shaft. The shaft is provided with
Guard rails. A door is placed a sufficior_t distance in Prom
entrance of tunnel to prevent admission of gases or fumes,
The method of ore extraction is slopes and piston machines.
The method of timtering is stalls and aquaee sets.
Timbfrs are pine and spruce prepared by hand. Underground
tramming is done by mules.
The system of ventilation is natural. The shaft is divided
into two compartments, ono •for ladder other for bucket.
Lardi.r~s in ladderway are 16 feet a part. All levels are
connected. Tho 2iine has three exile by means of Tunnels
runnir~ to surface. Electricity Ss used for lighting under-
ground.
TAT 1 _ T I C S.
Average tonna$e par month 200. Cost of timber .10~ per foot.
''~, Cost of
powder ,16~ par lb,
'~'•' Oost transporting su lie~•
;~ pp ~ to Line X2.50 per ton.
f~~ Cost of Mining ore
',~-~ ~1C.oc per ton.
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