Mine detail: Hughlett and Gray Mine

Previously called ''

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Location

Lat / long:

42.49751, -90.40428

Resource(M)

Primary:	Zinc
Secondary:	Lead
Ore:	Chalcopyrite, Galena, Sphalerite
Gangue:	Calcite, Dolomite, Pyrite, Quartz
Discovery year:	1919

Production

Operation type:	Unknown
Production size:	Yes
Development status:	Past Producer
Production years:	1919-21; 1941-43
First production started:	1919
Last production ended:	1943

Geology

Host rock:	Guttenberg Member, Decorah Formation;Prosser Cherty Member, Galena Dolomite
Host type:	Limestone
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	W800005
DEP	10086155
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. 184.}
Reporter	Mason Jr., G.T., Hedgman, Cheryl (Cannon, W.F.), Sutphin, David M.