Mine detail: Rockford Mining and Milling Co. Mine

Previously called ''

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Location

Lat / long:

42.44807, -90.239

Resource(M)

Primary:	Lead, Zinc
Ore:	Galena, Sphalerite
Gangue:	Calcite, Dolomite, Pyrite, Quartz

Production

Operation type:	Unknown
Production size:	Yes
Development status:	Unknown
First production started:	1905
Last production ended:	1915

Geology

Host rock:	Stewartville Massive Member
Host type:	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.
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	W800307
DEP	10086387
Reference	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
Reporter	Mason Jr., G.T., Hedgman, Cheryl (Cannon, W.F.), Sutphin, David M.