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Gold/Mining/Energy : Gold and Silver Juniors, Mid-tiers and Producers
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From: loantech9/17/2007 11:37:45 PM
   of 78418
 
Eight veins have been found on the property. The main Benton vein
has been explored and mined through the Kansas adit for an over-all strike
length of 2,000 feet trending N. 20° to 40° E., and for 600 feet in depth.
The main ore shoots were formed within a network of intersecting veins related
to premineral faulting, and their emplacement was governed by structural control.
The ore bodies have a pronounced rake (inclination in the plane of the
vein) to the south. Minor postmineral faulting has been encountered but nothing
that presented a serious problem.
On the bottom level (1,020) development revealed ore of better grade than
the average value of ore mined in upper levels. A drift on the Louisiana No.
1 vein, 200 feet long, with a strike N. 80° E. and dip of 55° N.W., to its
junction with the Benton Vein showed ore which averaged $25 a ton for widths
of from 22 to 3 feet, with the face still in ore when work stopped. A winze
on the 1,020 level sunk on the Benton vein from a point 50 feet south of the
Kansas crosscut to a depth of 64 feet was channel sampled at about 5-foot intervals
in both compartments of the winze. The north compartment samples
averaged about $40 a ton for 4-1 feet average; the samples from the north compartment
averaged about $18 a ton for approximately 5 feet average width*.
The cyanide plant of 40 tons capacity was completed in 1937 and enlarged
to 60 tons capacity in 1940. It incorporated a counter-current system using
Dorr thickeners, Dorr agitators, an Oliver continuous filter, together with
Merrill-Crowe precipitation equipment. Reportedly mill recovery was about
85 percent, which could be increased to 90 percent if changes indicated by
the operating experience were made. An adequate water supply was obtained
from Drain Creek. Diesel power was used.*
It may be noted that in 1941 the Benton Mine had the largest individual
payroll in the county.

ir.library.oregonstate.edu
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