Page 808 - calmining1890

754 REPORT OF THE STATE MINERALOGIST.
top aprons are four feet in width by six feet in length, and the pulp i
dropped two inches on aprons three feet eight inches in width by si:
feet in length. From this are sluices, eighteen inches wide by sixtee
and a half feet in length. The aprons have an inclination of one and a ha
inches to the foot, and the aprons and sluices are covered with silve
plated copper plate. Challenge feeders are in use in the mill. Plate
are also used inside the batteries, being six inches in width by forty-fou
inches in length. About 75 per cent of the gold recovered is saved ir
the battery, the product of the outside plates being 25 per cent. Eigtr
Frue concentrators are in use in the mill, serving to concentrate 1 pel
cent of sulphurets contained in the ore, whose average value is $66 pe]
ton. The plant has a three-ton revefberatory furnace and chlorinatior
works for the reduction of sulphurets. A contract for the working of tht
sulphurets has been given at $14 per ton and the use of the works. Th(
sulphurets are allowed to accumulate until a sufficient quantity is or
hand to make a run.
There are thirty men employed in the mine, receiving wages averaging
$2 50 per day. In the mill are five men whose wages average $3 pei
day; and outside labor, which includes blacksmiths, teamsters, etc
averages also $3 per day, there being ten men employed outside, making
the total number of employes forty-five men. The power for hoisting
is a ten by eighteen-inch cylinder, horizontal engine, there being twc
boilers fifty-four inches in diameter by sixteen feet in length, which
supply steam for the air compressor and pumps as well as for the hoist
A short distance above the fifth level, where the level encounters the
lower incline shaft, a chamber has been excavated and a six by ten-inch
double cylinder engine is placed there, and used for hoisting a self-
dumping skip from the workings below. The mill is supplied with power
by a twelve by twenty-inch cylinder engine, which is supplied with
steam by a boiler of the same dimensions as those in use at the hoisting
works. Three cords of wood are used in the hoisting works per day anc
four cords are used in the mill. It is pine wood and costs $3 per cord
delivered at the works. During the year the principal work done in the
mine was the retimbering of the main shaft and other portions of the
mine. The work on the flume by which power is to be created at the
river and transmitted by compressed air to the works, one and one hall
miles distant, has been vigorously pushed, and will be continued tc^
completion.
Altitude 3,300 feet.i
Length of ore shoot 300 feet.-
Length of upper incline 480 feet.
Length of lower incline 250 feet.
Vertical depth reached About 600 feet.
Maximum quantity of water raised 50,000 gallons in twenty-four hours.
Character of walls Slate.
Kind of powder used Hercules No. 2.
Cost of mining per ton . _ $2.
Kind of timber used Round and sawed pine.
Cost of round timber 4 cents per foot.
Cost of sawed timber $7 50 per thousand.
Length of road built . 25 miles.
Cost of road $20,000.
Length of ditch built (flume) 5 miles.
Cost of flume $5,000.
Character of ore Ribbon quartz, with sulphurets.
Number of stamps 20.
Weight of stamp 850 pounds.
Drop of stamps, 7 inches.
Drops per minute .90.