Mine detail: North Unity Mine

Previously called ''

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Location

Lat / long:

42.50279, -90.40567

Resource(M)

Primary:	Zinc
Tertiary:	Lead
Ore:	Sphalerite
Gangue:	Calcite, Dolomite, Pyrite, Quartz
Orebody form:	ARCUATE
Discovery year:	1913

Production

Operation type:	Unknown
Production size:	Yes
Development status:	Past Producer
Production years:	OPEND IN 1914 AND MINED AT INTERVALS TO 1948. THE MINE WAS OPENED FROM MAY 1942 TO MAY 1943 FOR ROBBING BY GILL BROTHERS. REOPENED FOR ROBBING AND STOPING APR 1945 TO SEP 1947.
First production started:	1914
Last production ended:	1948

Geology

Host rock:	Decorah Formation;Galena Dolomite
Host type:	Limestone,Dolomite
Structure:	Southeast Of Wisconsin Dome And On The Gentle West Limb Of Wisconsin Arch. To The South Is Illinois Basin And To The West And Southwest Is Forest City Basin. A Few Minles South O Fthe Zinc-Lead District Is Westward-Trending Savanna-Sabula Anticline. Regional Strike Is N 85 W And The Dip Is South., On The Same Syncline That Contains The Northwestern, Vinegar Hill, South Unity, Hughlett And Gray, And North Unity Mines.
Tectonic:	Stable Sedimentary Platform Having Later Mild Regional Deformation Sufficient To Produce Major And Minor Folds, Faults, Fracture Zones, And Joints.
Alteration processes:	Leaching, Silicification, Dolomitization

References

MRDS	W800092
DEP	10106499
Reference	{Deposit:: HEYL, A.V., AGNEW, A.F., LYONS, E.J., AND BEHRE, C.H., JR., 1959, THE GEOLOGY OF THE UPPER MISSISSIPPI VALLEY ZINC-LEAD DISTRICT: U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 309, 310 P.}{Deposit:: WILLMAN, H.B., REYNOLDS, R.R., AND HERBERT, PAUL, JR., 1946, GEOLOGICAL ASPECTS OF PROSPECTING AND AREAS FOR PROSPECTING IN THE ZINC-LEAD DISTRICT OF NORTHWESTERN ILLINOIS: ILLINOIS GEOLOGICAL SURVEY REPORT OF INVESTIGATIONS, NO. 116, 48 P.}{Production:: HEYL AND OTHERS, 1959, P. 183.}
Reporter	Hedgman, Cheryl (Cannon, W.), Sutphin, David M., Mason Jr., G.T.