Mine Index 10106422 Crystal Fluorspar Company/Minerva Oil Company, Jefferson Mine

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	S-T-R	23(N2SW)-12S-7E
	County:	Hardin
	Quadrangle:	Shetlerville
	District:	Fluorspar District
	Subdistrict:	Stewart Subdistrict

Mine Index Number: 10106422

ISGS ID:		MSHA ID:
MAS ID:	170690034	MRDS ID:	W062484
Company Name:	Minerva Oil Company, Crystal Fluorspar Company
Mine/Site Name:	Jefferson Mine
Active/Abandoned:	Abandoned
Start Date:	circa 1972	End Date:	Unknown
Commodity Type:	Non-Metallic
Commodity:	Fluorspar
Minerals Present:	Galena, Fluorite, Sphalerite
Type of Mine:	Underground
District:	Fluorspar District	Subdistrict:	Stewart Subdistrict
County:	Hardin
Section/Township/Range:	23(N2SW)-12S-7E
Latitude,Longitude:	37.4625699999999,-88.41115
Unit(s) Mined:	Lower Chesterian Series, Glen Dean Limestone, Renault Limestone
Feature(s) Mined:
MRDS Link:	https://mrdata.usgs.gov/mrds/show-mrds.php?dep id=10106422
Mindat link:

Discussion

Year Discovered: 1917 Year of First Production: 1926 Second Discovery Year: 1944

Mining District: Kentucky-Illinois

GALENA AND SPHALERITE WERE MODERATELY ABUNDANT

Mineral occurrence model information
Model code	174
USGS model code	26b
Deposit model name	Fluorspar deposits (fluorite veins)

Probably A Branch Of The Stewart Vein.

Faulting present

THE VEIN TRENDS N 30 E AND DIPS 80 SE. IT AVERAGES 4 FT WIDE.

COMMERCIAL PRODUCTION CAME FROM THE JEFFERSON MINE.

Workings at the site
Type of workings	Underground
Name of workings	SHAFT
Overall depth	79.25M

Ore body information
Width	0M
Length	0M
Area	4HA
Field	Value
Type of Orebody #1	FISSURE VEIN
Shape of Orebody #1	TABULAR
Type of Orebody #2	SHEAR ZONE
Type of Orebody #3	BRECCIA FILL
Primary mode of Origin	HYDROTHERMAL
Secondary mode of Origin	CONT METASOMATIC
Primary Ore Control	FAULTING
Secondary Ore Control	IGNEOUS
Degree of Wallrock Alter.	UNKNOWN
Type of Wallrock Alter. #1	UNKNOWN
Strike And Dip	N25E
Total Surface Area (HA)	4
Date of Last Modification	820224

Workings at the site
Type of workings	Underground
Field	Value
MAS Development Schedule #	1
Mining Record #	1
Status of Mining Method	ACTUAL
Mining Method	OVERHAND 10-38
Swell Factor	.6
Percent Waste Rock	20
Hardness of Rock	HARDROCK FISSURED WITH MODERATE WATER
Rock Characteristics	MULTIPLE SYSTEMS OF WEAKNESS PLANES
Rock Support Chars.	SUPPORTING
Mine Support Chars.	TIMBER
Capacity Units	MT ORE/DAY
Units of Production	$/MT ORE
Operating Shifts per Day	1
Year of Information	1972

References

U.S. BUREAU OF MINES, 1995, SPATIAL DATA EXTRACTED FROM THE MINERALS AVAILABILITY SYSTEM/MINERAL INDUSTRY LOCATION SYSTEM (MAS/MILS): U.S. BUREAU OF MINES SPECIAL PUBLICATION 12-95.

WELLER AND OTHERS, 1952, P. 143.

WELLER, J.M., GROGAN, R.M., AND TIPPIE, F.E., 1952, GEOLOGY OF THE FLUORSPAR DEPOSITS OF ILLINOIS: ILLINOIS STATE GEOLOGICAL SURVEY BULLETIN 76, 147 P.

JOHNSON, D. U. U. S. BUMINES, HEALTH AND SAFETY REPORT,

JEFFERSON MINE, APRIL 28, 1971.

WOOD, H. B. FLOURSPAR AND CRYOLITE. CHAPTER IN U.S.

BUMINES MINERALS YEARBOOK, 1971, P. 518.

JOHNSON DONALD U US BU MINES HEALTH AND SAFETY REPT JEFFERSON MINE APRIL 28 1971

External Links

Mineral Resources Data System (MRDS) USGS Link
https://mrdata.usgs.gov/mrds/show-mrds.php?dep id=10106422 Also referenced as 10169308