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| Ore charges being fired at 2000 degrees fahrenheit |
Charge after cooling in cupel mold. Note division of slag and lead |
After slag is broken from button, the lead cone is shaped into a cube. |
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| Lead cube contains any precious values and is ready for cupelling. |
Cupelling at 1750 degrees removes the lead, leaving any values behind. |
The assay bead remaining is usually gold combined with silver. |
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| Assay Beads, .1mg to 65mg. Each mg.= 1 troy oz value per ton of ore. |
Assay slags. Colors reflect the various minerals in the ore. |
Assay balance showing readout of 8 ten-thousands of 1 gram |
