Uranium-Mining Practices and Costs at Ten Salt Wash Lease Operations of Union Carbide Nuclear Co. Page: 21
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FIGURE 6. - Tramming Ore From Sphinx Incline to Ore Bin.
other miners on the plateau, Neilson and Klingingsmith use airleg-mounted
drills and 7/8-inch hexagonal drill steel. They buy drill steel in 5-foot
lengths and use a 1-5/8-inch, four-wing, one-use-type bit, which Klingingsmith
hard-surfaces with oxyacetylene tube-borium welding rod.
Hard surfacing increases the drilling life of the one-use-type bit from
about 15 to 120 feet in the ground at the Sphinx and St. Patrick mines. The
tube-borium rod contains 30-down-mesh tungsten carbide particles. Using a No.
7 tip and a feathered flame, Klingingsmith first lays a bead across the crest
of one of the wings (fig. 9). Fanning the wing with a minimum of heat causes
the mass to flow down, plating and fusing it onto the wing and gage faces.
Tube borium produces a serrated cutting edge on the wings, making them about
1/16 inch higher. No grinding is needed. A bit can be hard-surfaced in 3 to
The ground is similar to that at the Club mines and is easy to drill and
break. An average of 16 holes, loaded with 30-percent semigelatin dynamite
breaks 5 feet of ground in a 5- by 7-foot heading. The drill round is pat-
terned about a five-hole burn cut, the center hole of which is not loaded.
Where the ground is fractured, the drillers can break to fractures with as
few as 12 holes. When searching for new ore, Neilson uses sectional steel to
drill 18-foot holes with the leg-mounted machines.
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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/m1/27/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.