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American travel diary of an unknown Englishman, 1864
096_Journal Page 96
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is a machine shaking up & down till it shakes the copper to the bottom, In another the water is introduced at the bottom of a kind of box with a rush that floats the rock over the top leaving the copper at the bottom. There a several other methods all depending on the specific gravity of copper being greater than that of the rock. One of the most curious things in the mines are what they call walls which divide the loads of copper they are stone strata. the ones I saw at an L of about 60[degrees] & perfectly smooth, also between these layers a layer of about 1 or 2 inches of clay is often found which they use for fixing the
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is a machine shaking up & down till it shakes the copper to the bottom, In another the water is introduced at the bottom of a kind of box with a rush that floats the rock over the top leaving the copper at the bottom. There a several other methods all depending on the specific gravity of copper being greater than that of the rock. One of the most curious things in the mines are what they call walls which divide the loads of copper they are stone strata. the ones I saw at an L of about 60[degrees] & perfectly smooth, also between these layers a layer of about 1 or 2 inches of clay is often found which they use for fixing the
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