Mine detail: Northwestern Mine

Previously called ''

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Location

Lat / long:

42.49862, -90.39678

Resource(M)

Primary:	Zinc
Secondary:	Lead
Ore:	Galena, Sphalerite
Gangue:	Calcite, Dolomite, Pyrite, Quartz
Orebody form:	ARCUATE
Discovery year:	1903

Production

Operation type:	Unknown
Production size:	Yes
Development status:	Unknown
Production years:	FROM 1904 TO AFTER 1913 WITH SOME INTERRUPTIONS.
First production started:	1904
Last production ended:	1913

Geology

Host rock:	Ion Member;Guttenberg Member
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	W800126
DEP	10086254
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:: COX, G.H., 1914, LEAD AND ZINC DEPOSITS OF NORTHWESTERN ILLINOIS: ILLINOIS GEOLOGICAL SURVEY BULLETIN 21, 120 P.}{Deposit:: BAIN, H.F., 1905, ZINC AND LEAD DEPOSITS OF NORTHWESTERN ILLINOIS: U.S. GEOLOGICAL SURVEY BULLETIN 246, 56 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. 184.}
Reporter	Hedgman, Cheryl (Cannon, W.F.), Sutphin, David M., Mason Jr., G.T.