Mine detail: Berkshire Mine

Previously called 'Pioneer Mine'

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Location

Lat / long:

46.30111, -90.62402

Resource(M)

Primary:	Iron
Ore:	Goethite, Hematite, Magnetite
Orebody form:	STRATABOUND
Discovery year:	1848

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer
Production years:	1922-1924
First production started:	1922
Last production ended:	1924

Geology

Host rock:	Ironwood Formation
Host type:	Iron Formation
Structure:	N-Dipping Sediments; Regional Trends Are East To West., An E-W Linear Iron Formation Going From Gogebic, Mi, To Ironwood, Mi, And To Mellen, Wi, And A Bit Farther W.
Tectonic:	Canadian Shield
Alteration processes:	Gogebic Iron Range Is In The Chlorite Metamorphic Zone In The Least Metamorphosed Area Of The Upper Peninsula.

References

MRDS	W062003
DEP	10082655
Reference	{Deposit:: EMATI}{Deposit:: SCHMIDT, 1980: USGS BULLETIN 1460}{Production:: LAKE SUPERIOR IRON ORE ASSOCIATION, 1952, P. 53.}
Reporter	Sutphin, David M. (Cannon, W. F.), Mason Jr., G.T.