MINEBK01011

• County: San Miguel
• Volume: 7
• Document: Inspectr
• Suffix: A

MINING AND MINE METHODS.
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The property of the Keystone rydraulic ,rifting Company is
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situated on the north fork of the San T~Eiguel River, in San Miguel
bil~u( sl;;~~ta bass ,1..~hrb eta el:~u•~rusr.i ru;ritt n:i •~nt~,ls ~~r>;i'i'
County, and is operated by hydraulic washing. The water for this
puritose la taken Prom the San Miguel River, at a distance of half '
a mile above the present workings oP the mine, through a flume about
3,000,feat long; thence through a pipe line with a head of about
b00 feet to the pit or main workings. This water ie conveyed through
the giants at a pressure of about 140 lbs. The gravel when washed
Prom the, bank is convoyed through a sluice box, one half mile long,
Which is lined with 56 pound steel nails, its entire length, with
the exoeptdon of 200 feet, at the head of which is lined with steel
angle iron riffles. During high water the operations are carried on
in three shifts oP eight hours each, commencing at 7 o`clock,
3 o'clock and 11 o'clock, respectively.
The machinery consists of three hydraulic gianter two in the
pit and one at the dump. Also one water wheel, of 40 h/P/capacity;
and one Leyner oompresuor, Prom which they operate three pneumatic
air flrills, Por drilling boulders. At present they drill Prom 200
to 250 boulders per day. The loading ie,dona by ono man, and the
PSring takes plane at noon. The Gravel deposit is located in the
canon oP the north Pork oP the San Miguel River, and at present,
they are malting a cut through a 300 ft. bank of slide or gravel.
The waste water from the River is carried by the,pit by means
of a flume, 800 Pt. long, 12 ft. wide, and 4 Pt. deep,, and, by the
sluiae box, below the pit, through a flume oP the same dimenslona..,
At the present time they are working; about 36 men, four on tho'
night shift, ten on the afternoon shift, and the balance on the
day shift.
Tha boarding house is eituateAon the southeast of the
present workings, on a ridge between the old channel and the
present channel oP the river.
All of the men working at the mina board there. At this
time they are workln6 one blaakemith and helper, two carpenters,
eight pipe men, and the balartoe are oommon planer mina laborers.
Their average alsatt up per month is about Seven Thousand
pol'lare.