Moffet Johnson

Site Name

Primary: Moffet Johnson
Secondary: Moffat Mine

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Commodity

Primary: Copper
Secondary: Gold
Secondary: Silver

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Location

State: Montana
County: Madison
District: Tidal Wave

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Land Status

Land ownership: National Forest
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.

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Holdings

Type: Patented

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Workings

Not available

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Ownership

Owner Name: H. R. Hakes And Associates, Sheridan Mont.
Percent: 100.0
Home Office: Montana

Owner Name: H. C. Hopkins, Butte Mont., Johnston Estate Administrator
Home Office: Montana

Owner Name: Francis Bradley, San Bernardino Ca.
Home Office: California

Owner Name: John Fox, Missoula Mont.
Home Office: Montana

Owner Name: Pollinger, E. M.
Home Office: Twin Bridges, Mt
Info Year: 1978

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Production

Year: 1944
Description: 2.84% Cu, 23.31 G/Wt Ag, .823 G/Mt Au 369 Mt Ore Per Year
Year: 1916
Description: 2.32% Cu, 13.37 G/Mt Ag, .617 G/Mt Au 579 Mt Ore Per Year

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Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Surface-Underground
Mining Method: Unknown
Year First Production: 1916
Discovery Year: 1900
Years of Production:
Organization:
Significant: N

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Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains

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Mineral Deposit Model

Not available

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Orebody

Not available

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Structure

Not available

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Alterations

Not available

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Rocks

Not available

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Analytical Data

Not available

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Materials

Not available

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Comments

Comment (Location): DEPOSIT ALSO IN SECTION 3

Comment (Reserve-Resource): THIS MATRIX IS FOR THE SULFIDE ORE OF THE PROSPECT. THIS TONNAGE IS LOCATED IN 2 TACTITE ORE SHOOTS. ORE SHOOT 1 HAS 5443 TONS INDICATED AND 10886 TONS INFERRED. ORE SHOOT 2 HAS 22679 TONS INDICATED AND 45359 TONS INFERRED. THIS MATRIX IS FOR} THE OXIDIZED SURFACE ORE BODY OF THE PROSPECT. THIS MATRIX IS FOR THE COMBINED OXIDE AND SULFIDE ORE OF THE PROSPECT. M3CI=MICI+M2CI MATRIX 3 COLUMN 1 EQUALS MATRIX 1 COLUMN 1(SULFIDE) PLUS MAT IX 2 COLUMN 1 (OXIDE).

Comment (Reserve-Resource): MATRIX 1 IS FOR THE SULFIDE ORE. THIS IS COMPOSED OF 2 ORE SHOOTS. #1 SHOOT:AREA OF ORE BODY IN PLAN 181M2, 31M DEEP. #2 SHOOT: AREA OF ORE BODY IN PLAN 467M2, 45M DEEP. THE 2 SHOOTS ARE SEPARATED BY 75M OF WEAKLY MINERALIZED GROUND. MATRIX 2 IS FOR THE OXIDIZED ORE. THIS ZONE IS ON THE SURFA CE AND IS 2623M2 IN PLAN AND 20 M DEEP. IT IS 40 M EAST OF S ULFIDE ORE. MATRIX 3 IS FOR THE COMBINATION OF THE SULFIDE AND OXIDE ORE ZONES. THE MINERALIZATION IS ONE OF IRREGULAR TACTITE ZONE S RINGING IRREGULAR ISLANDS OF LIMESTONE SURROUNDED BY QUART Z MONZONITE. NO STRIKE AND DIP OF ORE ZONES, THEY ARE IRREGU LAR IN THEIR LOCATION.

Comment (Production): PROPERTY CONSISTS OF 15 PATENTED CLAIMS COVERING 58 HECTARE

Comment (Geology): MADISON FORMATION IS MASSIVE, MINOR FOLDING, BEDS STRIKE NOR TH, DIP 45 TO 80 DEG WEST. WHITE COARSELY CRYSTALLINE MARBLE HAS FORMED ALONG MANY QUARTZ AND MONZONITE-LIMESTONE CONTACTS TACTITE IS IRREGULAR IN SHAPE, COMPOSED MAINLY OF MASSIVE GR ANULAR BROWN GARNET, WITH FINE GRAINED LIGHT GREEN DIOPSIDE IN SOME PLACES. EPIDOTE, WOLLASTONITE ARE FOUND IN SMALLER AMOUNTS. TWO TYPES OF HORNFELS HAVE RESULTED FROM CONTACT ACTION BETWEEN THE QUARTZ MONZONITE AND THE LIMESTONE. A MASSIVE, LIGHT GREEN DIOPSIDE HORNFELS AND A SILICEOUS HORNFELS.

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References

Reference (Deposit): PROPERTY, MADISON COUNTY, MONTANA, USBM REPT. OF INVESTIGATI

Reference (Deposit): UR. MINES AND GEOL., BULL. 24, 53 P.

Reference (Deposit): TIDAL WAVE MINING DISTRICT, MADISON COUNTY, MONTANA, MONT. B

Reference (Deposit): JOHNS, W. M., 1961, GELOLGY AND ORE DEPOSITS OF THE SOUTHERN

Reference (Deposit): ONTANA AND ADJACENT DISTRICTS: USGS BULL. 574, P. 147-158.

Reference (Deposit): WINCHELL, A.N., 1914, MINING DISTRICTS OF THE DILLON QUAD, M

Reference (Deposit): OF THE MOFFET-JOHNSTON PROPERTY, MONTANA, USGS REPORT, 7 P.

Reference (Deposit): USBM MINERAL PROPERTY FILE 21.138, WESTERN FIELD OPERATION

Reference (Deposit): ON 3939, 12 P.

Reference (Deposit): MONTANA BUREAU OF MINES AND GEOLOGY BULL 100, 1976, 15P.

Reference (Deposit): MINES AND GEOL., MEMOIR 9.

Reference (Deposit): AL RECONNAISSANCE OF THE TOBACCO ROOT MOUNTAINS: MONT. BUR.

Reference (Deposit): TANSLEY, W., SCHAFER, P.A., AND HART, L.H., 1933, A GEOLOGIC

Reference (Deposit): L OF MINES.

Reference (Deposit): SON COUNTY, MONTANA: UNPUBLISHED MASTERS THESIS, MONT. SCHOO

Reference (Deposit): NES AND GEOL., MEMOIR 36.

Reference (Deposit): REYNER, M.L., 1947, GEOLOGY OF THE TIDAL WAVE DISTRICT, MADI

Reference (Deposit): BACCO ROOT MOUNTAINS, MADISON COUNTY, MONTANA: MONT. BUR. MI

Reference (Deposit): REID, R.R., 1957, BEDROCK GEOLOGY OF THE NORTH END OF THE TO

Reference (Deposit): FULL, R.P., ARMSTRONG, F.C., 1945, GEOLOGY AND ORE DEPOSITS

Reference (Deposit): CENTER, SPOKANE WASH.

Reference (Deposit): ROBY, R.N., 1946, EXPLORATION OF THE MOFFET-JOHNSTON COPPER

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Principal Gold Districts of Montana

In Montana, 54 mining districts have each have produced more than 10,000 ounces of gold. The largest producers are Butte, Helena, Marysville, and Virginia City, each having produced more than one million ounces. Twenty seven other districts are each credited with between 100,000 and one million ounces of gold production. Read more: Principal Gold Districts of Montana.