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Boston & North American Silver prospect, Silver City, Ontonagon Co., Michigan, USA

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Latitude & Longitude (WGS84): 46° 47' 3'' North , 89° 35' 10'' West
Latitude & Longitude (decimal): 46.78417,-89.58611
GeoHash:G#: f0261kv3s
Other regions containing this locality:Keweenaw Peninsula, Michigan, USA
Locality type:Prospect
Köppen climate type:Dfb : Warm-summer humid continental climate


Commodities (Major) - Silver
Development Status: Prospect
Host Rock Unit: Portage Lake Volcanics
Host Rock: Basalt

The Boston and North American Mining Company sank one shaft on this site in 1845 in hopes of finding copper. What was found was very little copper and some silver in the shaft, but not enough to continue exploration and the site was abandoned in 1846.



Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List

 No mineral species recorded.

Rock Types Recorded

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Select Rock List Type

Alphabetical List Tree Diagram

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Mesoproterozoic
1000 - 1600 Ma



ID: 2871549
Copper Harbor Conglomerate

Age: Mesoproterozoic (1000 - 1600 Ma)

Stratigraphic Name: Copper Harbor Conglomerate

Description: Red lithic conglomerate and sandstone; mafic to felsic volcanic flows similar to those of the unnamed formation (unit Yu) are interlayered with the sedimentary rocks.

Comments: Note: The unnamed formation has since been named the Porcupine Volcanics (Ypv).

Lithology: Major:{conglomerate,sandstone}, Minor:{mafic volcanic}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Stenian
1000 - 1200 Ma



ID: 3184900
Mesoproterozoic sedimentary rocks

Age: Stenian (1000 - 1200 Ma)

Comments: Mid-Continent Rift

Lithology: Sandstone-conglomerate

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
JOHNSON, A.M. AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, ONTONAGON COUNTY, P. 24-25, SITE ID # 660013, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.
Hamka, T., 2011, The Copper Mines of Ontonagon County, Michigan. Copperlady Press. 154 pp.

 
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