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Zortman - Landusky

Producer in Phillips county in Montana, United States with commodity Gold
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Controls for ore emplacement
  12. Economic information about the deposit and operations
  13. Links to other databases
  14. Bibliographic references
  15. Reporter information

Geologic information

Identification information

Deposit ID 10008952
MRDS ID D001506
Record type Site
Current site name Zortman - Landusky
Alternate or previous names Little Rockies, Zortman Mine, Landusky Mine

Geographic coordinates

Geographic coordinates: -108.56328, 47.93743 (WGS84)
Location accuracy 1000(meters)
Relative position Lat. And Long. Are General For Area

Site location context

Political divisions (FIPS codes)

Phillips(county)

Montana(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Zortman(quadrangle 1:24,000 scale)

Zortman(quadrangle 1:100,000 scale)

Lewistown(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Fort Peck Reservoir(hydrologic unit)

Fort Peck Lake(hydrologic accounting unit)

Missouri-Musselshell(hydrologic subregion)

Missouri(hydrologic region)

Geographic areas

Country State County
United States Montana Phillips

Public Land Survey System information

Meridian Township Range Section Fraction State
025N 025E 7 Montana

Comments on the location information

  • 120 MILES NORTHEAST OF BILLINGS, 50 MILES SOUTHEAST OF MALTA

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Fluorite Ore
Sylvanite Ore

Alteration

  • (Local) The Upper Portions Of Deposits Have Oxidized To Depths Of Up To 250 Meters, And The Ores Exploited To Date Have Come From These Zones.

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Syenite
    Stratigraphic age (youngest) Pliocene

Nearby scientific data

(1) -108.56328, 47.93743
ListMap

Economic information

Controls for ore emplacement

  • See Comments

Comments on the geologic information

  • THE HOST ROCKS ARE TERTIARY HYPABYSSAL INTRUSIONS OF MARGINALLY-ALKALINE SYENITE AND QUARTZ MONZONITE, INTO WHICH PHREATIC BRECCIA VEINS AND DIKES HAVE BEEN EMPLACED.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Significant No

Comments on the reserve resource information

  • YEAR END 1991: 110 MILLION TONS AT A GRADE OF .018 OZ GOLD PER TON. METAL RESERVES:2,005,752 OZ GOLD.

Comments on the workings information

  • HISTORICALLY THE ZORTMAN AND LANDUSKY DEPOSITS HAVE BEEN TREATED AS A SINGLE OPERATION. IN THE PAST MINING HAS NORMALLY BEEN CARRIED OUT AT ONE DEPOSIT WHILE EXPLORATION AND SUBSEQUENT DEVELOPMENT WAS CARRIED OUT AT THE OTHER. AT PRESENT (1993) MINING IS TAKING PLACE ON THE LANDUSKY SIDE WHILE THE ZORTMAN EXPANSION PROJECT IS BEING COMPLETED. ORE MINED FROM THE OPEN PITS AT THE ZORTMAN/LANDUSKY MINE IS HAULED TO NEARBY LEACH PADS. THE ORE REQUIRES NO CRUSHING AND/OR AGGLOMERATING AFTER BLASTING AND CAN BE PROCESSES AS RUN-OF-MINE MATERIAL. AFTER THE ORE HAS BEEN PLACED ON THE PAD, A SPRINKLER AND DRIP SYSTEM APPLIES AN ALKALINE CYANIDE SOLUTION TO DISSOLVE GOLD AND SILVER. THE GOLD AND SILVER SOLUTION IS GRAVITY-FED OR PUMPED TO A PREGNANT POND OR DIRECTLY TO A CARBON RECOVERY PLANT.

Reference information

Bibliographic references

  • Deposit

    CORRY, A.V., 1933, SOME GOLD DEPOSITS OF BROADWATER, BEAVERHEAD, PHILLIPS, AND FERGUS COUNTIES, MONTANA: MONT. BUREAU OF MINES AND GEOL. MEM. 10, P. 30-36

  • Deposit

    1992-93 RANDOL MINING DIRECTORY, P. 242

  • Production

    1992-92 RANDOL MINING DIRECTORY

  • Reserve-Resource

    1992-93 RANDOL MINING DIRECTORY

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-74 Fisher, Fred S. U.S. Geological Survey
Updater 01-JUL-93 Frank, Dave U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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