Grass Mountain Nightrider Snowmobile Club
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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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The lathes were for working steel. They could straighten bent drill steel, put new ends on the rods and send them back for reuse. The Gilman shop reused as much equipment and supplies as was possible.
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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...
4) Repair shop
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More steel milling machiner in the repair shop. The lathe at center is approximately 20 feet long.
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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.
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Drills and lathes in the repair area. Welders and machinists were employed by New Jersey Zinc to maintain and recycle equipment. During the 1950s, there were three shifts working each day to maintain production levels.
