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Standing above the cavern in the Gilman mine where the ball and rod mills are housed. The mills are on an incline for gravity feed down to the loading docks. At the center right of the photo, steel rods are stacked for use in the rod mill.
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At 16 level, the ore train would dump rock into the large pit (Grizzly) at the bottom of which was located a jaw crusher. The crusher would send the ore into the ball mill and rod mill where the ore was pulverized to a fine powder. Inside the ball mill, there would be ore and steel balls, approximately 10 in. in diameter. As the mill rotated, the ore was crushed by the balls. Eventually, the balls would wear down and Bob Riggle remembers his dad...
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The dryer building for zinc is at the far right. The zinc slurry would be heated and dried, leaving a very fine zinc powder. The powder was shipped in sealed box cars as it was so fine it would blow away in an open car. The rail line for shipping runs through the Eagle River Canyon (Belden area) so the final products for shipping were finished at this level.
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At right is the ball mill. At left is the rod mill. The mills are on an incline for gravity feed down to the loading docks. At the center right of the photo, steel rods are stacked for use in the rod mill.