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Cummingtonite & Sideroplesite Schist Ore Specimen, Homestake Mine [199449]

Currency:USD Category:Collectibles / Rocks, Fossils & Minerals Start Price:150.00 USD Estimated At:300.00 - 400.00 USD
Cummingtonite & Sideroplesite Schist Ore Specimen, Homestake Mine [199449]
SOLD
150.00USDto f*****E+ applicable fees & taxes.
This item SOLD at 2025 Aug 09 @ 11:26UTC-07:00 : PDT/MST
FINAL AUCTION RECORD The Auctioneer’s podium notes serve as the final, legally binding record of the auction results, superseding any electronic bidding records. See Terms and Conditions
Two very important and massive specimens. Both are about 12 x 6 x 3" Cummingtonite schist develops in the sideroplesite. They are critical indicator minerals for the Homestake Formation, which was responsible for more than 50 million ounces of gold. The Homestake Formation is composed of 2 Ga metamorphosed sedimentary rocks. Highly controlled internally by the structure and mineralogy.
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Date:
Country (if not USA):
State: South Dakota
City: Lead
Provenance: Homestake Mine Geologist Dave Shaddrick Collection