|Location is approximate, estimate based on other nearby localities.|
|Latitude & Longitude (WGS84):||47° North , 88° West (est.)|
|Margin of Error:||~2km|
|Other regions containing this locality:||Keweenaw Peninsula, Michigan, USA|
|Locality type:||Group of Shafts|
|Köppen climate type:||Dfb : Warm-summer humid continental climate|
A shaft belonging to the Isle Royale Mine in Houghton, Michigan. Located very near to the Portage Mine, but interestingly lacks datolite. Some good copper crystals can be found at this locality. Also one of the better locations for silver in the Keweenaw Peninsula.
8 valid minerals.
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Heinrich & Robinson (2004), Mineralogy of Michigan.