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Adventure mine, Greenland, Greenland Township, Ontonagon Co., Michigan, USA
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An underground copper mine consisting of three shafts and at least one adit. It is located just south of the town of Greenland, about 15 miles SE of Ontonagon. The Adventure Mining Co. organized in 1850. In 1858 it purchased the Merchants Co. property. In 1870 the company was sold and reorganized under the same name. In 1898, the company was sold again and reorganized under the Adventure Consolidated Copper Co. This consolidation included the Adventure, Hilton, and Knowlton mines. The company suspended all operation in October of 1917. The mine produced approx. 11 million lbs. of refined copper. The mine is currently open as a tourist attraction, and tours are given underground during the summer months. Minerals that can be found here include copper, silver, and quartz.

Mineral List

Calcite
'Chlorite Group'
Copper
Cuprite
Datolite
Epidote
'K Feldspar
var: Adularia'

Laumontite
Microcline
Prehnite
Pumpellyite-(Mg)
Quartz
Saponite
Silver
Tenorite


15 entries listed. 13 valid minerals.

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References

Henwood, W.J. (1871): Observations on Metalliferous Deposits: On the Native Copper of Lake Superior. Transactions of the Royal Geological Society of Cornwall 8(1), 385-489.

Rocks & Min. 58: 112

Rocks & Min. 65: 240

U.S.G.S. Prof. Paper 144.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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