Mine Index 10290702 Devry, Royal Princess Mine,California Diggings

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	S-T-R	28(NWSENE)-27N-5E
	County:	Jo Daviess
	Quadrangle:	Bellevue
	District:	Upper Mississippi Valley
	Subdistrict:

Mine Index Number: 10290702

ISGS ID:	9158	MSHA ID:
MAS ID:	170850047	MRDS ID:
Company Name:	Devry
Mine/Site Name:	Royal Princess Mine, California Diggings
Active/Abandoned:	Abandoned
Start Date:	1903	End Date:	1910
Commodity Type:	Metallic
Commodity:	Lead, Zinc
Minerals Present:	Galena, Dolomite, Calcite, Quartz, Marcasite, Pyrite
Type of Mine:	Underground
District:	Upper Mississippi Valley	Subdistrict:
County:	Jo Daviess
Section/Township/Range:	28(NWSENE)-27N-5E
Latitude,Longitude:	42.3083099999998,-90.3954099999998
Unit(s) Mined:	Maquoketa Shale Group
Feature(s) Mined:
MRDS Link:	https://mrdata.usgs.gov/mrds/show-mrds.php?dep id=10290702
Mindat link:

Discussion

ROYAL PRINCESS IS THE ONLY ZINC DEPOSIT IN A LARGE AREA OF LEAD DIGGINS KNOWN AS THE CALIFORNIA DIGGINGS.

THIS IS A GASH-VEIN DEPOSIT ALONG A MINERALIZED JOINT IN THE GALENA DOLOMITE ABOVE THE TOP OF THE PROSSER CHERTY MEMBER. THE STRIKE OF THE CONTROLLING VERTICAL JOINT WAS ABOUT N 70 W AT THE WEST END OF THE MINE.

ECON.COM: FIVE INCLINED HOLES WERE DRILLED IN 1946-47 SEEKING ZN ORE IN THE LOWER PART OF THE PROSSER CHERTY MEMBER OF THE GALENA DOLOMITE AND IN THE GUTTENBERG AND ION MEMBERS OF DECORAH FM.

Mine Data

Controls for ore emplacement

Vertical jointing

Workings at the site

Type of workings	Underground
Name of workings	STOPE
Length	182.88M
Width	15.24M
Width	6.1M
Overall length	685.8M

THREE SHAFTS WERE SUNK THE DEEPEST IS 265 FT.

References

Bibliography
BRADBURY,J.C., 1959, ILL.ST.GEOL. SURV. R.I. 210, P37

Bibliography
HOLT, STEPHEN P., DEC, 1948, BUMINES R.I. 4386.

Bibliography
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.

Bibliography
BAIN, H.F., 1905, ZINC AND LEAD DEPOSITS OF NORTHWESTERN ILLINOIS: U.S. GEOLOGICAL SURVEY BULLETIN 246, 56 P.

Bibliography
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.

External Links

Mineral Resources Data System (MRDS) USGS Link
https://mrdata.usgs.gov/mrds/show-mrds.php?dep_id=10290702
Also referenced as 10086402