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Mansfield Mine, Crystal Falls, Menominee iron range, Iron Co., Michigan, USA

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Latitude & Longitude (WGS84): 46° 6' 59'' North , 88° 13' 12'' West
Latitude & Longitude (decimal): 46.11639,-88.22000


Commodities (Major) - Iron
Deposit Type: Secondary Enrichment
Development Status: Past Producer
Deposit Model: 241: Superior Fe (BC name is Lake Superior & Rapitan types iron-formation)
Host Rock: Iron Formation

An iron mine worked from 1890 to 1913. This mine worked the Proterozoic Hemlock Volcanics Iron-formation of the Marquette Range supergroup. The roof of one part of this mine passed very close to the bed of the Michigamme River, close enough that miners could hear logs grinding against the river bottom as the logs floated down the river to sawmills. On September 28, 1893, the roof gave way under the river, flooding the mine and taking 27 lives.

Mineral List


7 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 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

Paleoproterozoic
1600 - 2500 Ma
Menominee Group; Hemlock Formation

Age: Proterozoic (1600 - 2500 Ma)

Stratigraphic Name: Hemlock Formation

Description: Predominantly mafic to intermediate volcanic flows and pyroclastic rocks with interlayered slate and tuff beds

Comments: Continental margin assemblage (north of Niagara Fault)

Lithology: Major:{mafic volcanic}, Incidental:{slate}

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]

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

Bernhardt M. (2001) (editor) "Men, Mines, and Memories", Iron County Museum, Caspian, Michigan.

Cannon, W. F. (1999) "Digital Geologic Map of the Penokean Continental Margin, Northern Michigan and Wisconsin", U.S. Geological Survey Open-File Report 99-547, U. S. G. S., Reston, VA.

BAYLEY, R. W., 1959, GEOLOGY OF THE LAKE MARY QUADRANGLE,IRON COUNTY, MICHIGAN. WASHINGTON, U.S. GOVT. PRINTING OFFICE, 1959 PP. 40-44.

LAKE SUPERIOR IRON ORE ASSOCIATION, 1938, LAKE SUPERIOR IRON ORES (1ST ED.): CLEVELAND, OHIO.

LAKE SUPERIOR IRON ORES, MINING DIRECTORY AND STATISTICAL REPORT, PUBLISHED BY THE LAKE SUPERIOR IRON ORE ASSOCIATION, 1952.

 
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