Page 209 - calmining1890

FRESNO COUNTY. 203
foot wall. The mine has been opened by an incline shaft sunk in the
foot wall and vein to a depth of five hundred and fifty feet. Its dimen-
sions are five by eight feet in the clear,
timbered with sawed yellow pine, six
by eight inches in size, costing $25 per
thousand feet. The cost of the incline
shaft has been $15 per foot. From
this incline have been run eight
levels, which are one hundred and
sixty, two hundred and twenty, three
hundred, five hundred and sixty, one
thousand two hundred and ten, one
thousand two hundred, three hundred
and twenty-five, and twenty feet in
length, respectively. The levels have
been connected by a series of upraises
for ventilation, and from the third
level to the surface of the west side
of the main shaft are three air shalts,
respectively two hundred and sixty,
two hundred and fifty, and two hun-
dred and forty feet in depth. The
ore shoots are two in number, pitch-
ing to the east, quite flat, and lying
parallel with each other, separated by
poor vein matter, about an average of
one hundred and thirty feet apart.
In No. 1, or the upper shoot, stoping
has been done to a great extent, and
stopes have been driven in one con-
tinuous line three hundred and
twenty feet in length. In the second,
or bottom shoot, on No. 6 level, stop-
ing has been driven in one continuous
line five hundred and ninety feet in
length. Seventy-two thousand gal-
lons of water are handled every
twenty-four hours by three pumps —
one six-inch Cornish plunger and
two jackhead pumps. The kind of
powder used is Giant, and about one
pound of it is used to the extraction of one ton of ore. The cost of
mining ore is $2 per ton. The character of ore is quartz, with pyrites
of iron, and has averaged about $10 per ton in free gold. There is a
twenty-stamp mill, of one thousand-pound stamps, on the mine, which,
under a six-inch drop, are dropped eighty times per minute. The dis-
charge is six inches high, and two tons of ore are crushed per stamp
every twenty-four hours. Chrome steel shoes and dies are used, and
cost 8^ cents per pound. No. 9 slot-punched screens are the kind
used, the screen frames being divided into three parts to each battery
of seven inches in width by seventeen inches in length. The aprons
are four feet in width by four feet in length, and there are fourteen
feet of sluice to each battery, fourteen inches wide, all covered with