36437, Sept 9, 1862). Although the "Keith Process" of ore crushing and smelting worked in the laboratory, he failed to perfect the system on an industrial scale. He was superintendent of several mining operations, including the well known Mammoth mine, which closed when the vein pinched out.
36437, September 9, 1862). Although the "Keith Process" of ore crushing and smelting functioned in laboratory conditions, he did not succeed in perfecting it on an industrial scale. He served as superintendent of various mining operations, including the well-known Mammoth mine, which closed when the vein tapered off.