A circular depression created by a sunken volcanic vent in the ground, or meteoric impact
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Category: <span>C</span>
The mass of rock adjacent to, or hosting an orebody
A chemical used to dissolve gold and silver
An ore of copper, CuS
Extracting gold or silver by dissolving it in cyanide solution
A trigonal metallic mineral, Al2O3
The lowest grade of mineralized material deemed economic
Reactions such as oxidation, hydrolysis, hydration, and carbonation
Separating precious metals with a cupel or small clay cup
Cylindrical cross section of rock obtained by drilling