The gold mine was mined from about 1900 to 1991. The Sunnyside vein is associated with the Eureka graben. The vein not only contained gold and silver but lead, zinc, and copper and hosted large amounts of sphalertie along with some fluorite. Stop 3 of Yager et al.
References
Page 416 - Yager, D. B. et al., 2016, New perspectives on a 140-year legacy of mining and abandoned mine cleanup in the San Juan Mountains, Colorado: Geol. Soc. Am. Field Guide 44, p. 377-419
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