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Show Location of Ores Revealed by Smoke Over the entrance to the principal mine of a lead company In Arizona hangs a portrait of "Antonio, the Cave Finder," an employee who roams about the underground passage puffing puff-ing cigarettes, says Popular Mechanics Mechan-ics Magazine. Ho keeps close watch of the smol-e as it drifts away, and If he sees it disappearing through tiny breaks In the rock formation, the" workings are extended In that direction, which often leads to Inner caves, rich in ore. Minerals in this region seem to have been deposited In cavities which lie in an approximately approxi-mately horizontal plane. The mine Is said to have been enlarged by more than half a mile in this manner. Tunnels are driven under the caves and the ore Isjlropped directly into the cars that carry it out of the mine. |