Historic Mine in the Eagle Mountains

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In the assaying process, after the ore sample and fluxes are heated in the crucible, the resulting precious metals and lead sink through the slag to the bottom of the crucible.  This would then be poured in a mold to cool.  After cooling, the assayer would use a hammer to break off the glassy looking slag.

In the assaying process, after the ore sample and fluxes are heated in the crucible, the resulting precious metals and lead sink through the slag to the bottom of the crucible. This would then be poured in a mold to cool. After cooling, the assayer would use a hammer to break off the glassy looking slag.

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