Johnny Gulch Iron

The Johnny Gulch Iron is a iron mine located in Madison county, Montana at an elevation of 6,440 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: Johnny Gulch Iron
Secondary: Ruby Creek

Commodity

Primary: Iron
Secondary: Gold

Location

State: Montana
County: Madison
District: Unorganized

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: Isabella And Hazel Daems

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1934
Discovery Year: 1900
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: M

Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains
Physiographic Detail: Gravelly Range

Mineral Deposit Model

Not available

Orebody

Form: TABULAR

Structure

Type: R
Description: On East Limb Of Gravelly Range Syncline

Alterations

Alteration Type: L
Alteration Text: Muscovite - Chlorite & Biotite - Chlorite Phase Of Green Schist Facies

Rocks

Name: Quartzite
Role: Host
Age Type: Host Rock
Age Young: Neoproterozoic

Analytical Data

Analytical Data: GRADE RANGES FROM 23 TO 34 PERCENT FE GRADE OF GOLD ORE IN QTZ VEIN IN PREE IRON FM UNKNOWN

Materials

Ore: Magnetite
Ore: Hematite
Ore: Gold
Gangue: Dolomite
Gangue: Chert

Comments

Comment (Workings): 66 FT INCLINE SHAFT (DIP IS 32 DEGREES) IS CAVED AT PORTAL. DRIFTS ARE REPORTED ON 3 LEVELS

Comment (Production): GRADE AND TONNAGE OF GOLD ORE PRODUCED IN 1934 - 1936 IS NOT KNOWN. MILLING PROCESS OF AU ORE IN EFFICIET SINCE ONLY 44 % RECOVERY REPORTED.

Comment (Deposit): TWO ORE BEDS, AN FESILICATE - CHERT BED AND A MAGNETITE - CHERT BED TOTALLING 280 FT THICK

Comment (Location): 1 1/2 MILES SOUTH OF THE YELLOW STONE (CAMERON) TALC MINE

References

Reference (Deposit): HOGBERG, R. K., 1960 , GEOLOGY OF THE RUBY CREEK IRON DEPOSIT, MADISON CO. MT. 11TH ANN. FIELD CONF., 1960 BILLINGS GEOL. SOC.

Reference (Deposit): DEMUNK, V. C., 1956 , IRON DEPOSITS IN MONTANA: MONTANA BUREAU OF MINES AND GEOLOGY INFORMATION CIRCULAR 13 , P. 41.

Reference (Deposit): BAYLEY, R. W., AND JAMES, H. L., 1973 , PRECAMBRIAN IRON FORMATIONS OF THE U. S.: ECON GEOL. VOL. 68 , NO. 7

Reference (Deposit): HOGBERG, R.K., 1960, GEOLOGY OF THE RUBY CREEK IRON DEPOSIT, MADISON COUNTY, MONTANA, IN 11TH ANNUAL FIELD CONFERENCE, BILLINGS GEOLOGICAL SOCIETY.

Reference (Deposit): DEMUNK, V.C., 1956, IRON DEPOSITS IN MONTANA: MONTANA BUREAU OF MINES AND GEOLOGY INFORMATION CIRCULAR 13.

Reference (Deposit): 1956 COMPILE MBMG REPORT (INFORMATION CIRCULAR)

Reference (Deposit): 1960 GEOLMAP NORTHERN PAC. R. R. REPORT, 11TH ANN CONF. BGS

Reference (Deposit): 1969 COMPILE MBMG, SUMMARY REPORT (UNPUBLISHED)

Reference (Deposit): MONTANA BUREAU OF MINES AND GEOLOGY,(N.D.), UNPUBLISHED SUMMARY OF INFORMATION ON IRON ORE, BITUMINOUS COAL, FLUORITE, AND CHROMITE: MONTANA BUREAU OF MINES AND GEOLOGY.

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.