MINEBK00884

• County: San Miguel
• Volume: 14
• Document: Inspectr
• Suffix: C

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<r rock quarts and iron sulphides: The metals are gold
,

, silver,' lead and zinc. All of the rein filling is conoen-
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• tration ores with an average of 6,75 per ton. The pro-
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, dnctiba is about 9500 tons per month.
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~;~( BIIRFA CE PLANT.
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ThE surfece plant consists of three air coa{pressbra.

-:` ~ One Rand 14 x 22 x 22, one Ingersoll Sargent ?,4~ x 13}x18
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, one Ingersoll Sargent 25} x 141 x 14.
a Operated by eleotrieitq.
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~'. ` The other buildings are one large boarding house
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i~ house, stable, all the above are near. entrance of tunnel.
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u'i;s~.; There are several tenement houses near and stood the
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# workings all about two to fi••e' hundPed feet Prom mouth
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~, of tunnel.
!t '! I E x P L 0 SINE S.
;;~. ~ Ihi Pont 40p ponder, imported Insoloid Z. L. fuse; 5-x caps
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: and mccden tamping bars are used. Explosives Sn excess
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cf one d2-•s sug*+ly are not stored underground. The a~er-
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~' ~'~ age amount of explosives kept in storage is about 500^
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pounds. This is kept in a stone building vrith a dirt roof
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n ~~ situated about 500 feet Prom entrance of ~tinnel and used
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~~,.~~ ' for this purpose only. Oils candles and other combustibles
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lii~~a~ . ~~; are stored in the store room. The device for thawing
powder is a steam heated house.
~ Mining and Mine Methods.
The main opening 8s a tunnel on the Ophir vein, where
work is carded on at the present time. The method of
ore extraction is overhand etoping and flrifting. with
air Q~ili8, Ingersoll hammer and piston drills are used.
.~ The method of timbering le stalls and square seta covered
with lagging, The timers are pine and epYucse, Prepared
,~ bq hand and s.., sufficient to secure safety. Underground
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{ tramming is done by hand, mules anfl electric motors.
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' Steel CRTR er
a usec~.fo- tramming. Chutes are loaded nq '
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•i hard and ~ra~+it~•. •The s•ratem of ventilation is natural.
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~~ All old ti~:bera have been removedfro:~linderground and
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G i'•!' the sanitary conditions are good Eiectriot
q grid Candles
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; are used for lighting underground. _
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