Centennial #6 was started in the 1870's in hopes of reaching the Calumet Conglomerate lode, which it did. #6 also mined the Osceola Amygdaloid and the Kearsarge Lode through a crosscut. In 1923 it was bought by Calumet & Hecla. In the 1970's Homestake Mining dewatered the mine to the 32nd level in hopes of finding another profitable orebody; it did not, and the project was abandoned in the early 1990's. Nice specimens of copper, especially copper "skulls" can be found here, as well as gemmy epidote crystals in the conglomerate. The mine is still privately owned, and permission must be granted before visiting.
References
Minerals Today, Jan, 1990:34.
The Copper Country Rock & Mineral Club, 2001, Red Gold and Tarnished Silver, 2nd Ed.
Mineral List
10 entries listed. 9 valid minerals.
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