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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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All repairs to equipment were done in the mine's repair shop. In this photo there is milling machinery to work steel. A rack of steel bars is at far right.
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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...
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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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7) Lathes
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A closer look at the lathes.
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O.A. McClain and Jesse Belt shearing bar steel for timber truck reinforcement. The shearing machine saved many tedious hours of sawing and cutting bar steel.
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O.A. McClain, left, watches as Jessie Belt shears bar steel for timber truck reinforcements. The extra stock of bar steel is in the backgound.
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Emmet Flaherty preparing to pre-heat two blank pieces of hollow drill steel. In the background is an automatic oil-fired forge which will bring these blanks to an exact temperature for forging. From the hollow drill blanks, finished pieces of lugged steel are formed for use in rock drills.
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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.