Shaft Northwest of Twelvemile Knoll

The Shaft Northwest of Twelvemile Knoll is a lead and zinc mine located in Beaver county, Utah at an elevation of 5,620 feet.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Shaft Northwest of Twelvemile Knoll

Commodity

Primary: Lead
Primary: Zinc
Secondary: Silver

Location

State: Utah
County: Beaver
District: Star District

Land Status

Land ownership: BLM Administrative Area
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Type: Underground

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: Replacement
Operation Type: Unknown
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Form: IRREGULAR VEIN

Structure

Type: R
Description: Colorado Plateau/Basin & Range Transition Zone, Cordilleran Hingeline

Type: L
Description: Eastward Dipping Homocline (Star Range) Believed To Be Part Of An Eastward Moving Thrust Plate.

Alterations

Not available

Rocks

Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Pliocene

Analytical Data

Not available

Materials

Ore: Smithsonite
Ore: Jarosite
Ore: Plumbojarosite

Comments

Comment (Location): SECTION SUBDIVISIONS SE 1/4 SW 1/4 SW 1/4 SECTION 11

Comment (Deposit): SHAFT 100 FT

References

Reference (Deposit): PERRY, L, I, 1976, LEAD AND ZINC IN UTAH: UTAH GEOL & MIN SURVEY OPEN FILE REPORT #22.

Reference (Deposit): BAER, J L, 1962, GEOL OF THE STAR RANGE, BEAVER COUNTY, UTAH: B Y U STUDIES, V 9, PART 2, P 29-52.

Reference (Deposit): 1913 RECON BUTLER, B S, USGS PP #80

Reference (Deposit): 1920 RECON BUTLER, B S, USGS PP #111

Reference (Deposit): 1962 GEOLMAP BAER, J L, BYU STUDIES V 9

Reference (Deposit): BAETCKE, G B, 1969, STRATIGRAPHY OF THE STAR RANGE AND RECONNAISSANCE STUDY OF THREE SELECTED MINES: UNIV OF UTAH P HD THESIS.

Reference (Deposit): 1963 COMPILE HEYL, A V, USGS BULL 1135-B

Reference (Deposit): 1973 COMPILE UGA PUBL #3

Reference (Deposit): 1973 GEOLMAP UGMS SS #46

Reference (Production): EVERTS, M L, 1979, ON SITE INVESTIGATIONS: UT GEOL AND MIN SUR

Reference (Deposit): ABOU-ZIED, S, AND WHELAN, J, A, 1973, GEOLOGY AND MINERALOGY OF THE MILFORD FLAT QUADRANGLE, STAR DISTRICT, BEAVER CO, UT, UGMS SPEC S 46

Reference (Deposit): GEOLOGY OF THE MILFORD AREA, 1973, UTAH GEOL ASSOC PUBL 3.

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