The enlargement of an adit, mine opening or trench by excavating layers of side from its sidewalls
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Tag: <span>S</span>
The fused or partially fused concentrate of byproducts leftover from the smelting of metal
A metamorphic rock mass formed at the intersection of two large igneous masses
A white precious metal Symbol, Ag.
A period within the Paleozoic era, 440 to 400 million years ago
Settled concentrations of sediment usually under an aqueous body
An orthorhombic, trimorphous mineral, Al2SiO5
A mass of igneous rock intruding between older rock strata
A chemical agent used to liquefy gold and silver for the purpose of refinement or possible transportation
A mass of igneous rock intruding between older rock strata