The Pittsburgh and Isle Royale Mining Company incorporated in 1846 opened the Haytown Mine, the second mine to begin work on Isle Royale, in 1847. The mine site was chosen because of a fifteen foot wide amygdaloidal vein that crossed the property and showed early promise. By 1849, additional exploration of the property discovered more veins about a mile from the shoreline. In 1850, the company had driven two shafts and an adit at their Todd Harbor location. The copper at this location was found as sheets and stamp ore. In 1850, the mine shipped around 4,500 pounds of copper that yielded 75 percent pure copper. Several mass pieces of copper were recovered, included one that weighed 700 pounds. The mine began losing money and shut down in 1853 due to its remote location.

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Standard Detailed Gallery Strunz Chemical Elements

Commodity List

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

ⓘ Copper

Mineral List

ⓘ Native Copper

1 valid mineral.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

ⓘ Basalt

Detailed Mineral List:

ⓘ Native Copper

Formula: Cu

References:

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘ	Native Copper	1.AA.05	Cu

List of minerals for each chemical element

Cu	Copper
Cu	ⓘ Native Copper	Cu

Other Databases

Link to USGS MRDS:	10082649

Other Regions, Features and Areas containing this locality

North AmericaContinent

Lake SuperiorLake

North America PlateTectonic Plate

Mid-continent DomainDomain
Mid-continent RiftNarrow Rift

USA

Midcontinent RiftGeologic Province

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References

Lane, A.C. (1898) Upper Peninsula 1893-1897, Geologic Report on Isle Royale, Michigan. Geological Survey of Michigan: 6(1), 281 pages.

Huber, N.K. (1973) Geologic Map of Isle Royale National Park, Keweenaw County, Michigan: United States Geological Survey, Miscellaneous Geologic Investigations Map I-796, scale 1:62,500.

Kaminski-Hamka, T. (2011) The Copper Mines of Keweenaw County, Michigan. Copperlady Press. 150 pages.

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