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Walls of silver galena
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Between 1549 and the 20th century, the ore extracted at the Tellure Park mine consisted of silver galena, a lead sulfide (PbS) that contained 2-3% silver. The gneiss walls of the galleries were also made of blende and secondary metalliferous minerals, such as "gray copper" (tetrahedrite, tennantite), pyrite, and chalcopyrite. The galena that impregnated the rock was sometimes mixed with a matrix of quartz and barite. The mass' thickness often varied between 8 to 11 inches (20 to 30 cm), but it could reach up to 5 ft (1.50m).
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