The quartz was then crushed into a fine dust by stamping batteries in a stamping mill.
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The characteristic indicator of a former stamping mill is the mortarstone.
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In 1794, he built the first stamping mill in America.
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This involved vertical hammers powered by a waterwheel in a stamping mill, of which at least 60 are known to have existed on Dartmoor.
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As it became necessary to regularly process pieces of ore-bearing rock that were too large to be directly ground in a crazing mill, stamping was introduced.