Mine detail: Gray Mine

Previously called ''

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Location

Lat / long:

42.35168, -90.39594

Resource(M)

Primary:	Zinc
Tertiary:	Cadmium
Ore:	Sphalerite
Gangue:	Calcite, Dolomite, Pyrite, Quartz
Discovery year:	1926

Production

Operation type:	Unknown
Production size:	Yes
Development status:	Unknown
First production started:	1944
Last production ended:	1949

Geology

Host rock:	Mcgregor;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., Bautsch-Black Jack Trough
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	W800228
DEP	10086334
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:: ZINNER AND LINCOLN, 1946.}{Deposit:: LYONS, HEYL, AND AGNEW, 1949.}{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.}{Reserve-Resource:: HEYL AND OTHERS, 1959, P. 180.}
Reporter	Hedgman, Cheryl (Cannon, W.), Sutohin, D.M., Mason Jr., G.T.