MINEBK00054

• County: San Miguel
• Volume: 13
• Document: Inspectr
• Suffix: A

-3-
silver, lead and pink, all the vein fi_liinp; ~s conoen+.,ration
ores, with gn avaraCe of 6,72 per ton. The production is
~s t61t per month.
S~`RFAfJF PLANT.
The surface plant consists o!` 5 air compressors one Hand
14 x 22 x 22, one Ingersoll Sar{~Rnt 244 x 134 x 18, one Inger-
soll sarp;en't 2.54 x 144' x 14. Ons hotsting PnQine 12 x 15:
48 x 48, All the above machinPxy runs by eleetrieity, The
other tnzildinps are large bo~rdinp house, store house, stable.
All the above are close to entrance of tu~vzP.l, Th~» are 28
tenement houses around the works .from ±wo to fine hundred feet
around the tunnel.
F R P L' ©. S I~ F S,
ihz Pont 40~a powder, imported Insoioid 2 L flzse; 5-x cape
and wodan tamping bars are used. Explosives in exoess of one
days sup»ly are not stored underground. The average aMrn~nt of
explosives kart in storage is 6,n00 Ibs, this is kept in a
stone building with a dirt roof, situat,pd about 550 feet frnm
shaft house, and usedf_or this pur*ror~?~ only, 012 s, candies and
other combustabl?s era stored in a store mom. The device
for thawing powder is a steam heated house, Powder monkey
employed to loakafter powder.
M I N I N 6' A N I? M I 2d E N E T H 0 D S.
The main opening is a tunnei'on the Argentine vein 1650 Peet
in length, host of the vein matter is talon out above said
tunnel for a distanne of 450 feet high, there is a~shaft sunk
on the vein at the entrance b4 tunnel about 450 feet deAp.
This ie where work is Carried on at Present on three level8,
both ~riftinp, and stoninLzr on both sides of shaft, The method
of ore extraction 'is overhand stoning and drift3.ng wi+.h air drills
Ingersoll Ham*nPr'a.nd Piston drills Are used. The method of
timbering is stuns and square sets cover?d with lagging,
the tirzbprs are pine and spruce, prepared by hand and are auf-
ficient to secure safety, t7nderpround tr.aminp; is done by hand,
mules and eieo'trie motors. steel cars are used. for trtumning.
mutes are loaded by hand and gravity, The system of ventilation
is natural, there are several winses and raises fnr e~nnAni.-
ing the different levels asot~ manways and air.