Uranium-Mining Practices and Costs at Ten Salt Wash Lease Operations of Union Carbide Nuclear Co. Page: 15
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The old development entries were adits or inclines. The old-time miners
drove the Rambler adit beneath the ore and dropped the ore to the adit level
through chutes. Wheelbarrows generally were used in the stopes.
Before May 1, 1957, Washburn operated the Club mines under a conventional
lease contract, concentrating his efforts principally on developing and mining
new ore bodies or extensions of previously mined ore bodies found by explora-
tory drilling. As the number of uninvestigated ore holes decreased, he de-
voted more time to cleaning up ore remaining in the old stopes and drifting on
any promising ore leads. On May 15, 1957, his lease was modified to match the
changing conditions at the mine, and he began operating under a "55-45-type"
contract, whereby he received 55 percent of the gross value of the ore and all
allowances except the initial production bonus.
Cleaning up an old mine presents a somewhat different problem in under-
ground haulage, especially when the mine workings are as extensive and irregu-
lar as those of the Club mines. Mining is not confined to any one stope for
long periods. The working crews move frequently from one place in the mine to
another and need small haulage units capable of being operated on adverse
grades and not restricted to rails. Washburn uses both diesel-powered Shuttle
Buggies and horse-drawn, 16-cubic-foot-capacity, end-dump carts with rubber-tired
wheels. (See figs. 4 and 5.) Therefore, the necessity of laying new track
and relocating old track is eliminated, also of keeping bottoms on track
grade. Instead of using the old development entries, Washburn has found it
advantageous to sink short slope-type entries to intersect the old workings
near promising stoping areas. These slopes were driven on grades (near 15
percent) that could be pulled by ore buggies and horses. The maximum grade up
which Washburn will allow a horse to pull a load is 25 percent, then only for
a distance of about 30 feet. Washburn estimated that his average haulage dis-
tance is about 600 feet.
The buggies and carts are loaded by hand shoveling from muck sheets.
Washburn believes that this is the cheapest and most efficient method of load-
ing where production comes from scattered headings. At the surface the ore is
trammed to timber trestles and dumped directly into trucks; ore bins are not
needed. Ore taken from slopes without dumping facilities is hauled on the
surface to a slope that has them.
The Shuttle Buggies were built by Young's Machine Co., Monticello, Utah.
They have a struck capacity of 32 cubic feet and hold approximately 2 tons
when the ore is heaped. The buggies are powered by 10-horsepower, one-cylin-
der, four-cycle, Deutz FIL 612 diesel engines manufactured in Germany, which
drive a single set of wheels that are mounted under the dump box and have 32-
by 8.8-inch, 12-ply tires. The buggies are steered by a set of smaller dual
wheels mounted centrally under the driver and are 10 feet 6 inches long, 4 feet
4 inches wide, and 4 feet 4 inches high. The loading height of the box is 3
feet 6 inches.
The ore sandstone at the Club mines appears more friable than that in
many Salt Wash deposits, and 13 to 17 holes are needed to break 5-1/2 feet of
ground in a 6- by 7-foot drift. The four-hole burn cut is spotted beneath
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Dare, W. L. Uranium-Mining Practices and Costs at Ten Salt Wash Lease Operations of Union Carbide Nuclear Co., report, 1959; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc170712/m1/21/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.