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Sublevel

Any level of an underground mine beneath its main workings

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Subduction

When a plate of the earth crust is pushed back into the Earth’s mantle by the force of the descending plate

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Stromatolite

A mineral formed by the compaction of sediment whose constituent is cyanophytes, also known as blue-green algae

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Stringer

A small discontinuous vein or shoot of mineralization

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Syncline

A downward arching fold in rock strata bedded rocks

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Survey

A formal study pertaining to the specific characteristics of the geophysical or geochemical properties of the Earth’s surface