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Zortman Mine

Past Producer in Phillips county in Montana, United States with commodities Gold, Silver
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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. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Controls for ore emplacement
  12. Economic information about the deposit and operations
  13. Mineral rights holdings
  14. Land status
  15. Ownership information
  16. Production statistics
  17. Reserves and resources
  18. Workings at the site
  19. Links to other databases
  20. Bibliographic references
  21. General comments
  22. Reporter information

Geologic information

Identification information

Deposit ID 10124596
MRDS ID W015572
MAS/MILS ID 0300710080
Record type Site
Current site name Zortman Mine
Alternate or previous names Zortman-Landusky Mine and Plants, August Mine, Little Ben, Rudy Gulch Mine, Zortman, Zortman Extension, Landusky, Independent, Alabama, Gold Bug
Related records 10071877

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -108.61998, 47.90993 (WGS84)
Elevation 1402
Location accuracy 10(meters)

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)

Federal lands

Bureau of Land Management(Bureau of Land Management MT)

Bureau of Land Management MT BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States Montana Phillips

Public Land Survey System information

Meridian Township Range Section Fraction State
Montana Principal 025 N 024 E 22 SWNWNE Montana

Commodities

Commodity Importance
Gold Primary
Silver Tertiary

Materials information

Materials Type of material
Gold Ore
Silver Ore
Sylvanite Ore
Calaverite Ore
Hessite Ore
Pyrite Ore
Sphalerite Ore
Fluorite Gangue
Calcite Gangue

Mineral occurrence model information

Model code 84
USGS model code 22b
Deposit model name Alkaline Au-Te (Au-Ag-Te veins)
Mark3 model number 80

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Quartz Monzonite
    Rock unit name QUARTZ MONZONITE
    Stratigraphic age (youngest) Tertiary
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Syenite
    Rock unit name SYENITE
    Stratigraphic age (youngest) Tertiary
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Rock unit name RHYOLITE
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Quartz Latite
    Rock unit name QUARTZ LATITE
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyodacite
    Rock unit name RHYODACITE
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Trachyte
    Rock unit name TRACHYTE PORPHYRY
  • Host or associated Associated
    Rock type Sedimentary Rock
    Rock unit name SEDIMENTS
  • Host or associated Associated
    Rock type Metamorphic Rock > Metasedimentary Rock
    Rock unit name METASEDIMENTS

Nearby scientific data

Main Entrance (1) -108.61998, 47.90993
ListMap

Economic information

Controls for ore emplacement

  • Shearing

Comments on the geologic information

  • MINERALIZATION WAS ORIGINALLY SULFIDES, WITH PYRITE DOMINANT AND WITH MINOR ARSENOPYRITE, MARCASITE AND COVELLITE. THE GOLD OCCURRED WITH THE PYRITE. OXIDATION EXTENDS TO 200 MTRS OR MORE IN DEPTH, WITH SULFIDES OCCURRING BELOW THIS. THE GRADE OF THE OXIDE ZONE AVERAGES 0.65 GM/MT AU. THE SULFIDES AVERAGE 2.80 GM/MT AU. SILVER IS ASSOCIATED WITH THE GOLD AND OCCURS AT A RATIO 2:1 SILVER TO GOLD.

Economic information about the deposit and operations

Operation type Surface
Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant Yes
Discovery year 1975
Mining method Open Pit
Year of first production 1979
Plant type Leach
Plant subcategory Hydromet
Milling method Heap Leach-Carbon Column-Merrill-Crowe

Mineral rights holdings

Type of mineral rights Located Claim
Type of mineral rights Patented

Land status

Ownership category Unknown

Ownership information

  • Type Owner-Operator
    Owner Pegasus Gold Inc.
    ID 2400539
    Interest 100
    Home office Washington
    Year 1995

Comments on the ownership information

  • THE RUBY GULCH MINE IS OPERATED BY THE ZORTMAN MINING CO. THE AUGUST, AND LITTLE BEN MINES ARE OPERATED BY THE LANDUSKY MINING CO. BOTH ZORTMAN AND LANDUSKY MINING COMPANIES ARE OWNED BY PEGASUS GOLD CORP. OF VANCOUVOR, B.C. CANADA. THE ZORTMAN MINING COMPANY AND THE LANDUSKY MINING COMPANY ACT AS ONE MINING COMPANY WITH OFFICES AND FIRE REFINERY IN ZORTMAN, MT.

Production statistics

  • Year 1979
    Ore mined 651000mt
    Description Mill Feed @ 1.03 Gm Au, 2.06 Gm Ag 651000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 2g/mt
    Major Gold Gold 1g/mt
  • Year 1980
    Ore mined 1170000mt
    Description Same As Above 1170000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 2
    Major Gold Gold 1g/mt
  • Year 1981
    Ore mined 1857000mt
    Description Same As Above 1857000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 2g/mt
    Major Gold Gold 1g/mt
  • Year 1982
    Ore mined 3116000mt
    Description Same As Above 3116000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 2g/mt
    Major Gold Gold 1g/mt
  • Year 1983
    Ore mined 3654000mt
    Description Mill Feed @ 1.13 Gm Au, 6.86 Gm Ag 3654000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 7g/mt
    Major Gold Gold 1g/mt
  • Year 1984
    Ore mined 5171000mt
    Description Mill Feed @ 0.79 Gm Au, 6.86 Gm Ag 5171000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 4727729.87g 7g/mt
    Major Gold Gold 2550485.85g 1g/mt
  • Year 1985
    Ore mined 4808000mt
    Description Mill Feed @ 0.72 Gm, Au 6.86 Gm Ag 4808000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 7g/mt
    Major Gold Gold 1g/mt
  • Year 1986
    Ore mined 5914000mt
    Description Mill Feed @ 0.651 G Au 5914000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 1g/mt
  • Year 1987
    Ore mined 8766000mt
    Description Mill Feed @ Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 6314007.66g 2g/mt
    Major Gold Gold 3324962.65g 1g/mt
  • Year 1988
    Ore mined 10410000mt
    Accuracy Accurate
    Description Mill Feed @ Mt Ore
  • Year 1989
    Ore mined 9119000mt
    Description Mill Feed @ 9119000 Mt Ore
  • Year 1990
    Ore mined 11812000mt
    Description Mill Feed @ .55 Gm Au, 6.9 Gm Ag 11812000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 20285693.57g 7g/mt
    Major Gold Gold 3412052.41g 1g/mt
  • Year 1991
    Ore mined 12916000mt
    Description Mill Feed @ .62 Gm Au, 9.2 Gm Ag 12916000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 29685167.04g 9g/mt
    Major Gold Gold 3617335.42g 1g/mt
  • Year 1992
    Ore mined 11770000mt
    Description Mill Feed @ .51 Gm Au, 8.2 Gm Ag 11770000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 8g/mt
    Major Gold Gold 3190555g 1g/mt
  • Year 1993
    Ore mined 11340000mt
    Description Mill Feed @ .58 Gm Au, 5.9 Gm Ag 11340000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 16662137.45g 6g/mt
    Major Gold Gold 3374728.23g 1g/mt
  • Year 1994
    Ore mined 13430000mt
    Accuracy Accurate
    Description Mill Feed @ .58 Gm Au, 4.3 Gm Ag 13430000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 13218981.55g 4g/mt
    Major Gold Gold 3404991.92g 1g/mt
  • Year 1995
    Ore mined 9090000mt
    Accuracy Accurate
    Description Gold Production 110900 T Oz/Yr Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 15567294.74g
    Major Gold Gold 3449376.6g 0g/mt

Comments on the production information

  • HEAP LEACHING OPERATION. 1988 AU PROD.= 90,000 OZ., 1989 AU PROD.= 106,400 OZ. AU FROM 9,161,000 MT ORE LEACHED. 1989 RESERVE = 765,000 OZ. CONT. AU. THREE-FOUR WINTER MONTHS LOST TO PRODUCTION DUE TO INCLEMENT WEATHER.
  • PRODUCTION FROM 1884 TO 1985 ESTIMATED AT: 727,414 OZ AU 789,000 OZ AG;

    PRODUCTION FROM 1903 TO 1950 FROM THE RUBY GULCH PROPERTY (ZORTMAN SIDE) EST. AT:
    270,OOO OZ AU, 3,000,000 OZ AG (FROM THE MINING RECORD, MAY 6, 1992);

    FROM THE LANDUSKY SIDE FROM 1907 TO 1942:
    120,150 OZ AU, 3,782,500 OZ AG
    BULK-MINEABLE; HEAP-LEACH.

    PRODUCTION REPORTED BY VARIOUS SOURCES:
    1980-34,000 OZ AU, 52,000 OZ AG, AVE. 0.31 OPT AU FROM 1,411,000 SHORT TONS MINED.
    1981-38,000 OZ AU, 104,000 OZ AG, AVE. 0.26 OPT AU FROM 2,163,000 SHORT TONS MINED.
    1982-67,000 OZ AU, 145,000 OZ AG, AVE. 0.037 OPT AU FROM 3,873,000 SHORT TONS MINED.
    1983-77,000 OZ AU, 175,000 OZ AG
    1984-70,000 OZ AU, 152,000 OZ AG.
    1986-92,000 OZ AU, 218,000 OZ AG
    1988-106,000 OZ AU, 218,000 OZ AG

Reserves and resources

  • Type In-situ
    Estimate year 1986
    Inferred 36288000mt ore
    Commodity Subtype Grade units Group Importance Year
    Silver Ag 6.857 g/mt Silver Trace 1986
    Gold Au 0.72 g/mt Gold Major 1986
  • Type In-situ
    Estimate year 1995
    Demonstrated 55600000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 0.71 g/mt Gold Major 1995
  • Type In-situ
    Estimate year 1995
    Demonstrated 70238000mt ore
    Commodity Subtype Grade units Group Importance Year
    Silver Ag 5.49 g/mt Silver Trace 1995
    Gold Au 0.69 g/mt Gold Major 1995
  • Type In-situ
    Estimate year 1996
    Demonstrated 64748000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 0.71 g/mt Gold Major 1996
  • Type In-situ
    Estimate year 1996
    Demonstrated 53269000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 0.71 g/mt Gold Major 1996
  • Type In-situ
    Estimate year 1997
    Demonstrated 62317000mt ore

Comments on the reserve resource information

  • RESERVES, PROVEN + PROBABLE 12/31/96, TOTAL ZORTMAN INCLS EXT. MINE CEASED OPERATION IN JAN 96 UNTIL DECISION OF ZORTMAN EXT CAN BE MADE. THE ZORTMAN SHOULD START UP IN 1998:
  • THE OXIDE ORE RESERVES GIVE THE OPERATION AN ADDITIONAL FOUR YEARS OF MINE LIFE. BECAUSE OF TOPOGRAPHIC RESTRAINTS, AND BECAUSE THE OXIDE ORE IS DIRECLTY UNDERLAIN BY THE SULFIDE ORE, NO INFERRED ORE RESOURCES HAVE BEEN ESTIMATED. PEGASUS DID NOT MAKE DRILL DATA AVAILABLE TO THE AUTHOR. IT WAS THEREFORE IMPOSSIBLE TO DETERMINE INFERRED RESOURCES FOR THE POTENTIALLY AVAILABLE NONOXIDE RESERVES. PUBLISHED RESERVES: OXIDE - 45,600,000 ST @ 0.015 OZ/ST AU SULFIDE - 56,800,000 ST @ 0.019 OZ/ST AU 1992 RESERVES FROM RANDOL 1993/94. 1995 RESERVES FROM PEGASUS 10-K REPORT, 12-94.

Workings at the site

  • Type of workings Surface
    Area 1290HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ESTIMATE
    Mining Method STRIP-HILLSIDE
    Percent Waste Rock 99.9
    Primary Material Cover M-HARD ROCKS
    Hardness of Ore M-HARD ROCKS
    Avg. Bench Height (meters) 6
    Capacity 53364
    Capacity Units MT ORE/DAY
    Unit Production Cost 2.05
    Units of Production $/MT ORE
    Operating Days per Year 195
    Operating Shifts per Day 2
    Year of Information 1990

Comments on other economic factors

  • DORE BULLION IS SHIPPED TO HANDY AND HARMAN IN ANAHEIM, CA., BY PLANE.
  • THERE ARE NO MINE EQUIPMENT OR EQUIPMENT CAPITAL COSTS BE- CAUSE ACTUAL MINING IS CONTRACTED OUT. INVESTMENT SHOWN DOES NOT INCLUDE PROPOSED SIX MILLION MINE CAPITAL THAT MAY BE SPENT ON UPGRADING MINING CAPABILITY TO EXPLOIT SULPHIDE ORE UNDERLYING OXIDES. WORK DUE 1993-1995. THERE ARE TWO SEPARATE OPEN PIT AND HEAP LEACH OPERATIONS;

Reference information

Bibliographic references

  • Reference

    ZORTMAN MINING CO. AND LANDUSKY MINING CO., PHILLIPS CO., MONTANA (UNDATED).

  • Reference

    CANADIAN MINES HANDBOOK 1981-82, P. 277.

  • Reference

    WORLD MINING, SEPT. 1982, P. 71.

  • Reference

    Wilson M R, Kyser T K 1988 - Geochemistry of porphyry-hosted Au-Ag deposits in the Little Rocky Mountains, Montana: in Econ. Geol. v83 pp 1329-1346

  • Reserve-Resource

    PLEXUS GOLD IN. 1985 ANNUAL REPORT.

  • Reserve-Resource

    PEGASUS GOLD INC., 1994 ANNUAL REPORT, P5 & 10-K, PP. 12-13.

  • Reserve-Resource

    MINING RECORD, PEGASUS INCREASES RESERVES 14 PERCENT IN THREE MONTHS, V 106/N 18, 3/29/95, PP. 1, 4.

  • Reserve-Resource

    PEGASUS GOLD INC., 1995 10-K REPORT, PP. 9, 13-14.

  • Reserve-Resource

    PEGASUS GOLD INC., 1995 ANNUAL REPORT, PP. 6-7, 11-13.

  • Deposit

    DAYTON, S.H., 1983, PEGASUS GOLD BUILDING A FUTURE FROM WHAT MAY BE THE WORLD?S LOWEST-GRADE BUT LARGEST HEAP LEACHING OPERATION: ENGINEERING AND MINING JOURNAL, DECEMBER, 1983, P. 24-28.

  • Reserve-Resource

    PEGASUS GOLD INC., 1996 ANNUAL REPORT, PP. 6-7, & FORM 10-K REPORT, PP. 8, 15-16.

  • 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

    MINE/DEPOSIT FILE REPORT: AUGUST, GOLD BUG, LITTLE BEN, RUBY GULCH MINES, ZORTMAN-LANDUSKY MINING COMPANIES, ZORTMAN, MT, USBM CONTRACT NO. SO221028, APRIL, 1983.

  • Deposit

    MONTANA DEPARTMENT OF STATE LANDS, DRAFT ENVIRONMENTAL IMPACT STATEMENT, PROPOSED PLAN OF MINING AND RECLAMATION, INTERNATIONAL MINING NEWS, VOL., 107, #47, 11/20/96, P1.

  • Deposit

    PEGASUS GOLD LTD. 1983 ANNUAL REPORT. 22 PP.

  • Deposit

    PEGASUS GOLD INC. 1984 ANNUAL REPORT. P. 12.

  • Deposit

    PEGASUS GOLD INC. FORM 10-K. DEC. 31, 1984, 18 PP.

  • Deposit

    PEGASUS GOLD INC. 1985 ANNUAL REPORT. 37 PP.

  • Deposit

    PEGASUS GOLD INC. FORM 10-K. DEC. 31, 1985, 65 PP.

  • Deposit

    PEGASUS GOLD INC. 1986 ANNUAL REPORT. 41 PP.

  • Deposit

    PEGASUS GOLD INC. PROSPECTUS (GOLDMAN, SACHS & CO., E.F. HUTTON AND COMPANY INC., PRUDENTIAL-BACHE CAPITAL FUNDING) JULY 20, 1987, 44 PP. PLUS F-53 P. FINANCIAL STATEMENT.

  • Deposit

    PEGASUS GOLD INC. 1987 ANNUAL REPORT. 37 PP.

  • Deposit

    PEGASUS GOLD INC. CORPORATE PROFILE. SPRING, 1987, 21 PP.

  • Deposit

    PEGASUS GOLD INC. 1988 CORPORATE PROFILE. 21 PP.

  • Deposit

    PEGASUS GOLD INC. 1988 ANNUAL REPORT. 36 PP.

  • Deposit

    ENDAR YEAR 1990, P. 27. ANNUAL REPORT. 49 PP.

  • Deposit

    LOEWEN, ONDAATJE, MCCUTCHEN & COMPANY LIMITED. MONITOR REPORT - PEGASUS GOLD INC. MAR. 20, 1990. 8 PP.

  • Deposit

    PEGASUS GOLD INC. PROXY STATEMENT. APRIL 27, 1990, 13 PP.

  • Deposit

    PEGASUS GOLD INC. PEGASUS GOLD REPORTS THIRD QUARTER RESULTS. OLT. 26, 1990, 2. PP.

  • Deposit

    E&MJ. THE NEW DRILLING AND BLASTING DIMENSION AT PEGASUS. GOLD. MAY, 1986, 5 PP. REPRINT.

  • Deposit

    GOLD. MAY, 1986, 5 PP. REPRINT.

  • Deposit

    PEGASUS GOLD INC. FORM 10-K. DEC. 31, 1989.

  • Deposit

    NORTHERN MINER PRESS. AMERICAN MINES HANDBOOK-1990. PP. 148-149.

  • Deposit

    BROOK HUNT & ASSOCIATES LTD. INDEPENDENT RESEARCH INTO METAL AND MINERAL RESOURCES AND THEIR MARKETS. 1986, PP. 350-353.

  • Deposit

    CROWHURST, J.J. DISCOVERY AND DEVELOPMENT OF THE PEGASUS OPERATION AT ZORTMAND AND LANDUSKY, PHILLIPS COUNTY, MONTANA IN: CASE HISTORIES OF MINERAL DISCOVERIES, V. 2, DISCOVERIES OF VALUABLE MINERALS AND PRECIOUS METALS DEPOSITS RELATED TO INTRUSIONS AND FAULTS. V.F. HOLLISTER, ED., SME-AIME, 1990, P. 117.

  • Deposit

    ROGERS, LESLIE M., AND M. STEPHEN ENDERS. SYENITE-HOSTED GOLD DEPOSITS OF THE LITTLE ROCKY MOUNTAINS, MONTANA. IN: CASE HISTORIES OF MINERAL DISCOVERIES, V. 2., DISCOVERIES OF VALUABLE MINERALS AND PRECIOUS METALS DEPOSITS RELATED TO INTRUSIONS AND FAULTS. V.E. HOLLISTER, ED., SME-AIME, 1990, PP. 117-130.

  • Deposit

    HASTINGS, J.S. GOLD DEPOSITS OF ZORTMAN-LANDUSKY, LITTLE ROCKY MOUNTAINS, MONTANA. IN: BULK MINEABLE PRECIOUS METAL DEPOSITS OF THE WESTERN UNITED STATES SYMPOSIUM PROCEEDINGS. GEOL. SOC. OF NEVADA, RENO, NV, 1988, PP 187-205.

  • Deposit

    ENDERS, M.S., AND L.M. ROGERS. DESIGN OF THE GEOLOGIC PROGRAM AT THE ZORTMAND AND LANDUSKY MINES, LITTLE ROCKY MOUNTAINS, MONTANA. SME-AIME PREPRINT NO. 83-373, 9 PP.

  • Deposit

    PROGRAM AT THE ZORTMAND AND LANDUSKY MINES, LITTLE ROCKY MOUNTAINS, MONTANA. SME-AIME PREPRINT NO. 83-373, 9 PP.

  • Deposit

    RIPLEY, RICHARD. PEGASUS MAY OPEN UNTAPPED GOLD DEPOSITS. SPOKANE JOURNAL OF BUSINESS, NOV. 21, 1990. 2 PP.

  • Deposit

    SPOKANE JOURNAL OF BUSINESS, NOV. 21, 1990. 2 PP.

  • Deposit

    MONTANA STANDARD. TOP CYANIDE LEACHING SITES LISTED. APT. 10, 1990. UNKNOWN P.

  • Deposit

    MCCULLOCH, ROBIN. UNPUBLISHED DATA ON THE ZORTMAN-LANDUSKY PROPERTY, FEB. 1991, 1 P.

  • Deposit

    RANDOL MINING DIRECTORY. 1990/1991. U.S. MINES AND MINING

  • Deposit

    COMPANIES. ZORTMAN-LANDUSKY MINE, 1990, PP. 43, 189.

  • Deposit

    MONT. BUREAU OF MINES AND GEOL. BULLETIN 129, 1991

  • Deposit

    GOLD GAZETTE, 7/3/95, P.13.

  • Deposit

    BUSINESS WIRE. "ZORTMAN RECEIVES RECORD OF DECISION" 10/28/96. 1P.

  • Deposit

    THE MINING RECORD, VOL., 107, #49, 12/4/96, PP. 8, 9.

  • Deposit

    PEGASUS GOLD NEWS RELEASE, JULY 22, 1996.

  • Deposit

    PEGASUS GOLD NEWS RELEASE, SEPT.30, 1996.

  • Deposit

    THE MINING RECORD, VOL 107, N47, NOV., 20, 1996, P1.

  • Deposit

    THE MINING RECORD, VOL 83, #18, JUNE 30, 1997, P14.

General comments

Subject category Comment text
Deposit INCLUDES THREE DISTINCT MINES, OWNED AND OPERATED BY ZORTMAN & LANDUSKY. THEIR PRODUCTION IS POOLED AND THE COMPANIES OPERATE A JOINT OFFICE. ZORTMAN & LANDUSKY ARE SUBSIDS. OF PEGASUS GOLD CORP. MINES ARE: AUGUST MINE: BOM SEQ# 0300710051: MSHA MINES ID #2401150 LITTLE BEN: BOM SEQ# 0300710018: NO MSHA MINES ID# RUDY GULCH MINE: BOM SEQ# 0300710004: MSHA MINES ID #2401450 THE ZORTMAN EXTENSION PROJECT IS IN NORTH-CENTRAL MONTANA AND 1.4 MILLION OUNCES OF GOLD (60 MILLION TONNES GRADING .71G/T) IN PROVEN AND PROBABLE RESERVES. THE PERMITS WILL ALLOW THE COMPANY TO MINE 72 MILLION TONNES OF ORE AND THE ASSOCIATED 54 MILLION TONNES OF WASTE ROCK. UNDER THE APPROVED MINE PLAN ORE WILL BE CONVEYED TO A NEW HEAP LEACH FACILITY ON GOSLIN FLATS FOR TREATMENT AND WASTE ROCK WILL BE PLACED IN AN AREA, MUCH OF WHICH HAS PREVIOULSLY BEEN DISTURBED BY ZORTMAN OPERATIONS. CAPITAL FOR THE EXTENSION PROJECT IS PRESENTLY EXTIMATED AT $50 MILLION. MINING CEASED IN JAN 96 UNTIL DECISION OF ZORTMAN EXT CAN BE MADE BY 3 QRT 96, EXPECT + DECISION ON EXT. THE LANDUSKY CLOSED IN 1994: ONLY THE ZORTMAN AND ZORTMAN EXT WILL REOPEN SOME TIME IN 1998.
Deposit THE GOLD IS BELIEVED TO BE DERIVED FROM A MAGMATIC SOURCE, DEPOSITED IN MAJOR SHEAR ZONES AND FRACTURES AT HIGHER LEVELS OF THE INTRUSIVE COMPLEX. (HASTINGS, 1988).;

STRUCTURALLY CONTROLLED EPITHERMAL SYSTEMS (STOCKWORKS, BRECCIAS, FRACTURED `SHEETED? ZONES) (FROM A SUMMARY PROVIDED BY PEGASUS GOLD CORP., MBMG FILES)
Deposit Merged data from deposit ID10149096 (Landusky)

Reporter information

Type Date Name Affiliation Comment
Reporter 21-OCT-97 Buckingham, David A. U.S. Bureau of Mines

Beyond USGS

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

Maps centered on this site