Humboldt Mine, Copper Falls, Keweenaw Co., Michigan, USAi
|Regional Level Types|
|Copper Falls||- not defined -|
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Latitude & Longitude (WGS84):
47° 24' 56'' North , 88° 14' 51'' West
Latitude & Longitude (decimal):
Köppen climate type:
Commodities (Major) - Copper
Deposit Type: Fissure Copper Veins
Development Status: Past Producer
Deposit Model: 96: Native Cu
Host Rock Unit: Portage Lake Volcanics
Host Rock: Basalt
The Humboldt Mining Company was first organized in 1853 and worked the Ashbed Lode. The company sunk three shafts including one over 300 feet deep; however, no production was recorded as work only lasted one year before it was abandoned. The mine was reorganized in 1863 as the Humboldt Copper Company and worked the Arnold Ashbed until the mine closed in 1900. No copper production was recorded from this mine. Specimens of copper, prehnite, and pumpellyite can be found on the poor rock piles.
Regions containing this locality
|North America Plate||Tectonic Plate|
|Keweenaw Peninsula, Michigan, USA||Peninsula|
Select Mineral List TypeStandard Detailed Strunz Dana Chemical Elements
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
3 valid minerals.
Rock Types Recorded
Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List TypeAlphabetical List Tree Diagram
Detailed Mineral List:
| ⓘ Copper|
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
| ⓘ Pumpellyite-(Mg)|
Formula: Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Reference: www.sauktown sales.com
Reference: Yalmer Primeau collection
List of minerals arranged by Strunz 10th Edition classification
|Group 1 - Elements|
|Group 9 - Silicates|
|ⓘ||Pumpellyite-(Mg)||9.BG.20||Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O|
List of minerals arranged by Dana 8th Edition classification
|Group 1 - NATIVE ELEMENTS AND ALLOYS|
|Metals, other than the Platinum Group|
|Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups|
|Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in  and higher coordination; single and double groups (n = 1, 2)|
|ⓘ||Pumpellyite-(Mg)||188.8.131.52||Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O|
List of minerals for each chemical element
|H||ⓘ Pumpellyite-(Mg)||Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O|
|O||ⓘ Pumpellyite-(Mg)||Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O|
|Mg||ⓘ Pumpellyite-(Mg)||Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O|
|Al||ⓘ Pumpellyite-(Mg)||Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O|
|Si||ⓘ Pumpellyite-(Mg)||Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O|
|Ca||ⓘ Pumpellyite-(Mg)||Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O|
Sort byYear (asc) Year (desc) Author (A-Z) Author (Z-A)
JOHNSON, A.M. AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, KEWEENAW COUNTY, P. 141-143, SITE ID # 420042, MICHIGAN DEPARTMENT OF NATURAL RESOURCES
DeGood, L., 2011, Michigan Copper Mining Stocks and Bonds. 401 pp.
Kaminski-Hamka, T., 2011, The Copper Mines of Keweenaw County, Michigan. Copperlady Press, 150 pp.
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