Mine detail: Portland Mine

Previously called ''

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Location

Lat / long: 46.53472, -88.15226

Resource(M)

Primary: Iron
Ore: Hematite, Grunerite, Limonite
Gangue: Chert, Magnetite, Hornblende, Actinolite, Garnet, Mica

Production

Operation type: Surface
Deposit type: Secondary Enrichment
Production size: Small
Development status: Past Producer
First production started: 1909
Last production ended: 1915

Geology

Host rock:Bijiki Iron-Formation
Host type:Iron Formation
Alteration processes:Replacement of cherty beds by iron oxide and alteration of fe-silicates and carbonates to iron oxides

References

MRDSW028537
DEP10079316
Reference{Deposit:: KLASNER, J. S., AND CANNON, W. F., 1978 , BEDROCK GEOLOGY MAP OF THE SOUTHERN PART OF THE MICHIGAMME AND THREE LAKES QUADRANGLES, MARQUETTE AND BARAGA COUNTIES, MICHIGAN, USGS MAP 1 - 1078 .}{Deposit:: LAKE SUPERIOR IRON ORE ASSOCIATION, 1938 , LAKE SUPERIOR IRON ORES ( 1ST ED. ): CLEVELAND, OHIO, P. 116 .}{Deposit:: SECTION FILES, MICHIGAN GEOLOGICAL SURVEY, THE CLEVELAND-CLIFFS IRON CO., 1949 - 1950 , RECORD OF EXPLORATION, SECTION FILES OF THE GEOLOGICAL SURVEY DIVISION OF MICHIGAN DEPT. OF NATURAL RESOURCES.}{Deposit:: JOHNSON, A, 1998, INVENTORY OF UNDERGROUND MINES, BARAGA COUNTY, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.}
ReporterYeager, Keith (Cannon, W.), Sutphin, D.M., Mason Jr., G.T., Anderson, Arlene (M. Gere)