Pratt Mine

The Pratt Mine is a manganese mine located in Juab county, Utah at an elevation of 6,001 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

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Pratt Mine
Secondary: Black Boy #5

Commodity

Primary: Manganese
Tertiary: Arsenic
Tertiary: Gold
Tertiary: Silver
Tertiary: Sulfur
Tertiary: Zinc

Location

State: Utah
County: Juab
District: Detroit

Land Status

Land ownership: Private
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

Owner Name: Pratt (Estate)

Owner Name: Ward Leasing Co.
Home Office: Salt Lake City, Ut.
Years: 1941 - 1945

Production

Year: 1944
Description: Ap_Grade: ^Ave. 20.38% Mn, High 28.8, Low 13.60
Year: 1936
Description: Ap_Grade: ^1,312 T 10-35%, 1,635 T Greater Than 35% Mn
Year: 1929
Description: Ap_Grade: ^4.124 Tons 10-35%, 47 T Greater Than 35% Mn
Year: 1937
Description: Ap_Grade: ^1,375 T 10-35%, 30t Greater Than 35% Mn
Year: 1930
Description: Ap_Grade: ^10-35% Mn
Year: 1928
Description: Ap_Grade: ^10-35% Mn
Year: 1945
Time Period: 1942-1945
Description: Cp_Grade: ^36.6% Mn
Year: 1937
Time Period: 1924-1937
Description: Cp_Grade: ^10-35% Mn
Year: 1925
Time Period: 1924-1925
Description: Cp_Grade: ^10-35% Mn

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1924
Discovery Year: 1924
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: M

Physiography

General Physiographic Area: Intermontane Plateaus
Physiographic Province: Basin And Range Province
Physiographic Section: Great Basin
Physiographic Detail: Drum Mountains

Mineral Deposit Model

Not available

Orebody

Form: LENTICULAR

Structure

Type: R
Description: The Drum Mtns Form A Homocline That Dips Sw Under A Cover Of Volcanic Rocks. Regional Strike N 35 W At 25 Sw

Type: L
Description: A N 75 Deg E Trending Fault Which Displaces Quartzite-Dolomite Contact About 1500 Feet

Alterations

Alteration Type: L
Alteration Text: Oxidation To Depths Of 300 Ft.

Rocks

Name: Latite
Role: Associated
Age Type: Host Rock
Age Young: Late Cambrian

Name: Latite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Pliocene

Name: Latite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Analytical Data

Analytical Data: 1933 ANALYSIS OF RHODOCRHOSITES: MNO 40.53-47.90%, MNCO3 65.65-77.65%

Materials

Ore: Pyrolusite
Gangue: Sphalerite
Gangue: Barite
Gangue: Muscovite
Gangue: Pyrite
Gangue: Sericite

Comments

Comment (Development): THE BLACK BOY CLAIMS CONSIST OF WORKINGS IN 2 AREAS ABOUT 1/4 MILE APART, THE NORTHERN MOST AREA IS CALLED THE PRATT MINE AND INCLUDES WORKINGS IN THE AREA OF THE PRATT FAULT. 14 DIAMOND DRILL HOLES TOTALING 3,195 FT WERE DRILLED BY USBM IN 1940, AND 6 MORE HOLES (1926 FEET) IN 1945

Comment (Workings): SHAFT (#6 INCLINE) 165 FEET AT 45 DEG.

Comment (Commodity): THIS DEPOSIT SHARES WITH THOSE AT PHILIPSBURG, MONT. AND BATESVILLE, ARK., THE DISTINCTION OF BEING ONE OF THE FEW EXAMPLES OF REPLACEMENT OF CARBONATE ROCKS BY RHODOCHROSITE.

Comment (Reserve-Resource): USBM HOLE #101 (1945) PENETRATED 8 FT OF ORE AVE .25% MN, IN ADDITION THERE IS INFERRED TO BE A FEW THOUSAND TONS OF ORE (15-20% MN) IS THE LOWER EDGE OF THE #6 ORE BODY

Comment (Production): FROM A BATCH OF 505 LONG TONS OF ORE (1944) AVE. 36.60% MN, HIGH 42.01, LOW 35.855, FE 5.40%, SIO2 17.33%, AL2O3 4.93%, H2O 5.96%, INSOL. 0.002%

Comment (Deposit): IN THE HANGING WALL OF THE FAULT ZONE THERE ARE 3 LENTICULAR ORE BODIES WHICH PARALLEL THE BEDDING. THE DIMENSIONS ON THE LARGEST BODY ARE DESCRIBED ABOVE.

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

Comment (Reserve-Resource): THE OUTLOOK FOR FUTURE DISCOVERIES (LARGE) IS NOT BRIGHT. DRILLING IN 1941 EXPLORED THE LARGER FAULTED SEGMENTS FROM THE STAATZ FAULT-TO THE PRINCE SHAFT (PRATT MINE) WITH MOST HOLES CUTTING NO ORE

References

Reference (Analytical Data): SRC.REF: SEE GENERAL REF. #1

Reference (Deposit): CALLAGHAN, EUGENE, 1938, MANGANESE DEPOSITS OF THE DRUM MOUNTAINS, UTAH: ECON. GEOL. V. 33, NO. 5, P-508-521.

Reference (Deposit): CRITTENDEN, M.D., 1961, MANGANESE DEPOSITS IN THE DRUM MOUNTAINS JUAB AND MILLARD COUNTIES, UTAH: USGS BULL. 1082-H.

Reference (Deposit): KING, W.H., 1947, DRUM MTN MANGANESE PROJECT: USBM RI 3993

Reference (Deposit): CRITTENDEN, M.D., MANGANESE DEPOSITS OF UTAH: USGS BULL. 979-A, P. 28-30.

Reference (Deposit): 1938 RECON CALLAGHAN, EUGENE: ECON. GEOL. V. 33

Reference (Deposit): 1940 DIREXPL USBM - DIAMOND DRILLING

Reference (Deposit): 1945 DIREXPL USBM - DIAMOND DRILLING

Reference (Deposit): 1961 RECON CRITTENDEN, M.D: USGS BULL. 1082-H

Reference (Production): CRITTENDEN, M. D., 1961, MANGANESE DEPOSIT IN THE DRUM MTN: USGS BULL 1082-H

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