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The San Martin mine is producing gold from a hot spring-style, epithermal, low-sulfidation, gold deposit. On a regional scale, the project is on the northeastern side of a 20-kilometer-long, northwest trending, fault controlled basin called the Syria Graben. This graben is bounded by Paleozioc quartz muscovite schist and is filled with Tertiary air-fall tuff and lacustrine sediments. Gold was deposited in weak quartz vein stockwork and irregular quartz veins near the paleosurface associated with two centers of hot spring alteration. Silicification occurs in the overlying Tertiary and Quaternary sediments and forms a cap and in some places silica reached the surface forming hot spring sinter. The gold deposits trend east-west and are on the northern edge of the graben.
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