Grant Mine Easter Dome Project

Plant in Alaska, United States with commodities Gold, Silver

Geologic information

Identification information

Deposit ID 10232761
MRDS ID A015285
MAS/MILS ID 0020580021
Record type Site
Current site name Grant Mine Easter Dome Project
Alternate or previous names Ester Dome Project, Banjo, D and 2, Grant, Irishman, Roosevelt, White Rock, St. Patrick
Related records 10002813

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -147.95985, 64.88046 (WGS84)
Elevation 236
Location accuracy 1000(meters)
(click for info)

Geographic areas

Country State
United States Alaska

Public Land Survey System information

Meridian Township Range Section Fraction State
Fairbanks 001 N 002 W 28 NESWSE Alaska

Commodities

Commodity Importance
Gold Primary
Silver Secondary

Materials information

Materials Type of material
Arsenopyrite Unknown
Galena Unknown
Gold Unknown
Pyrite Unknown
Quartz Unknown
Stibnite Unknown
Tetrahedrite Unknown

Nearby scientific data

Main Entrance (1) -147.95985, 64.88046

Ore body information

  • Strike W35E
    Dip 60S
    Depth to top 3M
    Area 259HA
    Field Value
    Type of Orebody #1 FISSURE VEIN
    Shape of Orebody #1 LENTICULAR
    Type of Orebody #2 SHEAR ZONE
    Shape of Orebody #2 TABULAR
    Shape of Orebody #3 IRREGULAR
    Primary mode of Origin HYDROTHERMAL
    Primary Ore Control FRACTURING
    Degree of Wallrock Alter. MODERATE
    Type of Wallrock Alter. #1 SILICIFICATION
    Type of Wallrock Alter. #2 PYRITIZATION
    Strike And Dip W35E
    Minimum Depth to Top 1.5
    Avg. Thick. Unconsol. Mat. 0
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 259
    Date of Last Modification 920205

Economic information

Economic information about the deposit and operations

Operation type Surface-Underground
Development status Plant
Commodity type Metallic
Deposit size Small
Significant Yes
Discovery year 1912
Mining method Combined Methods
Year of first production 1912
Plant type Leach
Plant subcategory Hydromet
Milling method Leach-Precipitation

Comments on exploration

  • IN 1984, SILVERADO (55%), AUREX (40%), & TRI-CON SIGNED JOINT VENTURE FOR GRANT MINE ONLY. AUREX & TRI-CON CONTRIBUTED $5 MILLION FOR EXPLORATION, DEVEL., & MILL. BY 1985, 11,585 METERS OF DRILLING WAS COMPLETED.

Mining district

District name Fairbanks District

Mineral rights holdings

Type of mineral rights Located Claim

Land status

Ownership category State

Ownership information

  • Type Owner-Operator
    Owner Silverado Mines Ltd.
    Interest 100
    Home office Canada
    Year 1996
    First year 1993
  • Type Owner-Operator
    Owner Silverado Mines Ltd.
    Interest 50
    Home office Canada
    Year 1993
    Last year 1993
  • Type Owner
    Owner American Copper And Nickel Co.
    ID 5001314
    Interest 50
    Year 1993
    Last year 1993
  • Type Owner
    Owner Roger Burgraff
    ID 5001314
    Home office Alaska
    Year 1980
  • Type Operator
    Owner Tricon Mining, Inc.
    ID 5001314
    Home office Canada
    Year 1989

Comments on the ownership information

  • OPERATOR ADDRESS: (PRIOR TO 1993) TRI-CON MINING COMPANY, INC. P.O. BOX 83730 FAIRBANKS, ALASKA 99708 TELE: (907) 479-4686 OWNER-OPERATOR ADDRESS (AFTER 1993): SILVERADO MINES (U.S), INC. P.O. BOX 2357 FAIRBANKS, ALASKA 99707 TELE: (907) 479-4686 IN NOV. 1993, SILVERADO GAINED FULL OWNERSHIP WHEN AMERICAN COPPER AND NICKEL DECIDED TO DISSOLVE THE JOINT VENTURE AND QUITCLAIMED ITS INTEREST TO SILVERADO. SILVERADO IS ALSO THE OPERATOR.

Production statistics

  • Year 1981
    Description Grade 1 Oz/S.T. 8500 Short Tons Ore
  • Year 1987
    Description 907.0 Oz Au - $118,000 Profit For 1987 6555 Short Tons Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 28,211g
  • Year 1988
    Description 7815 Oz Au, Average Au Grade 0.75 Oz/St 82000 St + 14000 St (Contract)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 243,074g
  • Year 1988
    Description 3400 Oz Ag See Rec 4 For Pro & Units
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 105,752g
  • Year 1989
    Description Gold Production 1307 Troy Ounces Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 40,652g
  • Year 1989
    Description Silver Production 706 Troy Ounces Silver
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 21,959g

Comments on the production information

  • MINE & MILL OPENED IN OCT. 1985. AUREX PULLED OUT OF VENTURE IN DEC. 1985 AND THE MINE CLOSED. MINE REOPENED IN DEC. 1987 AFTER NEW DISCOVERIES. MINE SUSPENDED OPERATIONS IN FEB. 1989. TO DATE (2/92) MINE HAS NOT REOPENED. PRODUCTION 1981- 8500 TONS @ 1 OZ/TON. BAGGS-USBM. 81 NWMA 500-600 TONS ORE MILLED PRIOR TO 1931, YIELDED $15-20 PER TON (B 849 P. 150). RANDOL MINING DIRECTORY 1996-97: ESTIMATED PRODUCTION IS 25000 OZ AU/Y. PRODUCTION FROM THE 200-FOOT LEVEL.

Reserves and resources

  • Type In-situ
    Estimate year 1982
    Demonstrated 67,100mt ore
    Measured 67,100mt ore
    Total resources 67,100mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 24 g/mt Gold Major 1982
  • Type In-situ
    Estimate year 1985
    Total resources 1,167,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 20.9 g/mt Gold Major 1985
  • Type In-situ
    Estimate year 1989
    Demonstrated 45,360mt ore
    Indicated 45,360mt ore
    Total resources 45,360mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 5.48 g/mt Gold Major 1989
    Silver Ag 2.74 g/mt Silver Minor 1989
  • Type In-situ
    Estimate year 1989
    Demonstrated 17,690mt ore
    Indicated 17,690mt ore
    Total resources 17,690mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 25.37 g/mt Gold Major 1989
    Silver Ag 12.68 g/mt Silver Minor 1989
  • Type In-situ
    Estimate year 1989
    Demonstrated 272,160mt ore
    Indicated 272,160mt ore
    Total resources 272,160mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 9.26 g/mt Gold Major 1989
    Silver Ag 4.8 g/mt Silver Minor 1989
  • Type In-situ
    Estimate year 1989
    Demonstrated 334,210mt ore
    Indicated 334,210mt ore
    Total resources 334,210mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 9.26 g/mt Gold Major 1989
    Silver Ag 4.8 g/mt Silver Minor 1989
  • Type In-situ
    Estimate year 1989
    Inferred 380,117mt ore
    Total resources 380,117mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 9.26 g/mt Gold Major 1989
    Silver Ag 4.8 g/mt Silver Minor 1989
  • Type In-situ
    Estimate year 1993
    Demonstrated 408,000mt ore
    Total resources 408,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 10.63 g/mt Gold Major 1993
    Silver Ag 4.8 g/mt Silver Minor 1993
  • Type In-situ
    Estimate year 1996
    Total resources 272,155mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 10.63 g/mt Gold Major 1996

Comments on the reserve resource information

  • MOST RECENT PRODUCTION WAS FROM OCT. TO DEC.,1985 AND FROM LATE 1987 T0 FEB.1989. DEC.87 PROD.WAS 907 OZ.AU/JAN.89 PROD.WAS 738 OZ.AU. TRI-CON MINING WAS THE OPERATING CO. PEFR RECIEVED DEC.1990.WILL BE INCLUDED IN 1992 AU AVAIL.STUDY. PROPOSED MILLING IS FOR JIG/TABLES FOLLOWED BY CIP VAT LEACH. ALSO KNOW AS ESTER DOME PROJECT. M1C1 = SURFACE RESERVES; M2C1 = SURFACE TO 60.97 M UNDERGROUND RESERVES; M3C1 = 60.97 M TO 304.88 M UNDERGROUND RESERVES; M9C4 = TOTAL INDICATED RESERVES FROM M1 THROUGH M3; M9C5 = TOTAL INFERRED RESERVES.

Workings at the site

  • Type of workings Surface
    Area 20HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ESTIMATE
    Mining Method OPEN PIT
    Swell Factor .25
    Percent Waste Rock 78
    Avg. Overburden Thickness 3
    Hardness of Ore M-HARD ROCKS
    Avg. Bench Height (meters) 10
    Max. Pit Slope (degrees) 50
    Capacity 272
    Capacity Units MT ORE/DAY
    Preprod. Stripping Vol. 1989
    Unit Production Cost 25.33
    Units of Production $/MT ORE
    Operating Days per Year 350
    Operating Shifts per Day 2
    Year of Information 1989
  • Type of workings Underground
    Length 3875M
    Overall depth 304.9M
    Field Value
    MAS Development Schedule # 2
    Mining Record # 1
    Status of Mining Method ESTIMATE
    Mining Method HORIZ CUT & FILL W/WASTE ROCK 10-60
    Swell Factor .25
    Hardness of Rock HARDROCK FISSURED WITH MODERATE WATER
    Rock Characteristics MULTIPLE SYSTEMS OF WEAKNESS PLANES
    Rock Support Chars. UNSUPPORTING MAY SLOUGH
    Mine Support Chars. STEEL W/LAGGING CONCRETE REINFOR
    Number of Shafts 01
    Length of Inclines (m) 206.6
    Slope of Inclines 0
    Number of Inclines 07
    Avg. Length of Adits (m) 0
    Number of Adits 00
    1st Condition of Workings OPEN
    2nd Condition of Workings PART ACCESSIBLE
    Capacity 272
    Capacity Units MT ORE/DAY
    Unit Production Cost 51.17
    Units of Production $/MT ORE
    Operating Days per Year 350
    Operating Shifts per Day 2
    Year of Information 1989

Comments on the workings information

  • WATER IN TAILINGS POND IS RECYCLED TO MILL. 20 GPM MAKE-UP WATER IS ADDED FOR EVAPORATIVE LOSSES.

Comments on other economic factors

  • NOV. 1995, SILVERADO REPORTED THAT IT HAD ENTERED THE FINAL STAGE OF DRILLING ON THE PROPERTY BEFORE PLACING IT INTO PRODUCTION. SILVERADO PLANS TO CARRY OUT INFILL DRILLING FOR 30 REVERSE CIRCULATION HOLES IN THE SOUTH CENTRAL PORTION OF THE PROPERTY. SILVERADO HAS DRILLED 15 HOLES IN THE AREA. THE COMPANY PLANS TO SKIP THE FEASIBILITY STAGE AND PROCEED DIRECTLY TO PRODUCTION FROM AN 800 BY 300 FOOT AREA @ ST PAUL. THE SURFACE PLAN IS CATEGORIZED UNDER DEVEL. SCHEDUAL 1. THE CONCENTRATOR PLAN IS CATEGORIZED UNDER DEVEL. SCHEDUAL 1. THE UNDERGROUND PLAN IS CATEGORIZED UNDER DEVEL. SCHEDUAL 2. EQUIPMENT INCLUDES STEEL HEADFRAME, ELECTRIC HOIST, 25-TON GRAVITY MILL AND DIESEL-ELECTRIC GENERATOR. MILL BEING HOUSED FOR WINTER OPERATION. ALL WEATHER WATER SUPPLY FROM SHAFT SUMP. 1988 PAYROLL CONTRIBUTED $1,015,000 TO FAIRBANKS ECONOMY. AFOC-SMS (9-80).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
U.S. Bureau of Mines Minerals Availability System MAS 0020580021
USGS Mineral Resources Data System MRDS A015285 MAS references MRDS
Mine Safety and Health Administration MSHA MSHA 5001314

Bibliographic references

  • Ownership

    ALASKA KARDEX 058-035

  • Ownership

    ALASKA KARDEX 058-283

  • Reserve-Resource

    RANDOL MINING DIRECTORY 1996/97, P.120.

  • Reserve-Resource

    N MINER 820909 p. 6

  • Reserve-Resource

    W MNG NEWS 850301 p. 1

  • Deposit

    B836a p. 19

  • Deposit

    B849B p. 150

  • Deposit

    B910A p. 25

  • Deposit

    OF42 p. 19

  • Deposit

    P625D p. 17

  • Deposit

    MF410

  • Deposit

    AMR 81-82 pp. 16, 21, 22, 31

  • Deposit

    N MINER 820909

  • Deposit

    SR31 p. 11

  • Deposit

    SR33 pp. 12, 25

  • Deposit

    W MNG NEWS 850301

  • Deposit

    SR38 pp. 10, 16

  • Deposit

    AK MINES & G V34N2 pp. 7-8

  • Deposit

    EAKINS, G.R., ET AL. SELECTED MINERAL DEVELOPMENT PROJECTS

  • Deposit

    (GRANT GOLD MINE, FAIRBANKS DISTRICT). CH. IN ALASKA'S

  • Deposit

    MINERAL INDUSTRY 1984. AK DIV. GEOL. & GEOPHYS. SURV.

  • Deposit

    SPEC. REP. 38, 1985, P. 16.

  • Deposit

    BUNDTZEN, T.K., ET AL. MINERAL DEVELOPMENT IN 1985 (GRANT

  • Deposit

    GOLD MINE, EASTERN INTERIOR REGION). SEC. IN ALASKA'S

  • Deposit

    MINERAL INDUSTRY 1985. AK DIV. GEOL. & GEOPHYS. SURV.

  • Deposit

    SPEC. REP. 39, 1986, PP. 13-14.

  • Deposit

    BUNDTZEN, T.K., ET AL. 1981 MINERAL DEVELOPMENT AND

  • Deposit

    PRODUCTION PROJECTS IN ALASKA (GRANT MINE AND ESTER DOME

  • Deposit

    DEVELOPMENT, TRI-CON, INC. EASTCENTRAL REGION). SEC. IN

  • Deposit

    REVIEW OF ALASKA'S RESOURCES. AK DIV. GEOL. & GEOPHYS.

  • Deposit

    SURV., 1982, PP. 21-22.

  • Deposit

    ALASKA INDUSTRY. MINING IS MATURING IN FAIRBANKS. DEC.

  • Deposit

    1980, PP. 20, 32.

  • Deposit

    NORTH AMERICAN GOLD MINING INDUSTRY NEWS (WILSONVILLE, OR).

  • Deposit

    SILVERADO AIMS AT GETTING GRANT INTO PRODUCTION. DEC. 7,

  • Deposit

    1984, P. 20.

  • Deposit

    BUNDZTEN, T. K., ET AL. MINERAL PRODUCTION (EASTERN

  • Deposit

    INTERIOR REGION). SEC. IN ALASKA'S MINERAL INDUSTRY 1983.

  • Deposit

    AK DIV. GEOL. & GEOPHYS. SURV. SPEC. REP. 33, 1984, P. 25.

  • Deposit

    EAKINS, G.R., ET AL. MINERAL DEVELOPMENT (GRANT MINE'S

  • Deposit

    ESTER DOME, EASTERN INTERIOR REGION). SEC. IN ALASKA'S

  • Deposit

    MINERAL INDUSTRY 1982. AK DIV. GEOL. & GEOPHYS. SURV.

  • Deposit

    SPEC. REP. 31, 1983, P. 11.

  • Deposit

    EAKINS, G.R., ET AL. PRODUCTION (EASTERN INTERIOR REGION).

  • Deposit

    SEC. IN ALASKA'S MINERAL INDUSTRY 1984. AK DIV. GEOL. &

  • Deposit

    GEOPHYS. SURV. SPEC. REP. 38, 1985, PP. 9-10.

  • Deposit

    THE NORTHERN MINER (TORONTO). REPORT FROM VANCOUVER. MAY

  • Deposit

    24, 1984, P. 6.

  • Deposit

    EAKINS, G.R., ET AL. HARDROCK DRILLING. SEC. IN ALASKA'S

  • Deposit

    SPEC. REP. 38, 1985, PP. 31-32.

  • Deposit

    BUNDTZEN, T.K., ET AL. MINERAL PRODUCTION IN 1987 METALS

  • Deposit

    (EASTERN INTERIOR REGION). SEC. IN ALASKA'S MINERAL

  • Deposit

    INDUSTRY 1987. AK DIV. GEOL. & GEOPHYS. SURV. SPEC. REP.

  • Deposit

    41, 1988, PP. 30-31.

  • Deposit

    GREEN, C.B., ET AL. MINERAL PRODUCTION IN 1988 METALS

  • Deposit

    INDUSTRY 1988. AK DIV. GEOL. & GEOPHYS. SURV. SPEC. REP.

  • Deposit

    43, 1989, PP. 37-38.

  • Deposit

    ARMSTRONG, E.J. DESCRIPTION OF THE GRANT MINE LEACH

  • Deposit

    FACILITY. PRES. AT SHORT COURSE ON HEAP LEACHING IN

  • Deposit

    ALASKA. MARCH 22-23, 1988, 5 PP.; AVAIL. FROM AK DEP.

  • Deposit

    COMMERCE & ECON. DEVEL., FAIRBANKS, AK.

  • Deposit

    BURGRAFF, R. (GRANT MINE). PRIVATE COMMUNICATION, JULY 18,

  • Deposit

    1989; AVAIL. UPON REQUEST FROM D.A. HERZOG, BUMINES, AFOC.

  • Deposit

    MURTON, W., & T.K. BUNDTZEN. GEOLOGICAL AND PRODUCTION

  • Deposit

    ASPECTS OF THE GRANT GOLD MINE, FAIRBANKS DISTRICT,

  • Deposit

    ALASKA. AK MINES & GEOL., V. 34, NO. 2, APRIL 1985, P. 8.

  • Deposit

    SMITH, P.S. MINERAL INDUSTRY OF ALASKA. U.S. GEOL. SURV.

  • Deposit

    BULL. 933-A, 1942, P. 23.

  • Deposit

    ALASKA MINES & GEOLOGY. ESTER DOME GOLD MINE TO GET SECOND

  • Deposit

    LIFE. V. 34, NO. 2, 1985, PP. 9-10.

  • Deposit

    BUNDTZEN, T.K., & J.T. KLINE. GEOLOGIC MINE MAP, GRANT GOLD

  • Deposit

    MINE, FAIRBANKS MINING DISTRICT, ALASKA. AK DIV. GEOL. &

  • Deposit

    GEOPHYS. SURV. OFR 141, 1981, 2 PP.

  • Deposit

    CONWELL, C.N. MINERAL PREPARATION GRANT GOLD MINE, ALASKA.

  • Deposit

    AK DIV. GEOL. & GEOPHYS. SURV. GEOL. REP. 74, 1982, 16 PP.

  • Deposit

    THE ANCHORAGE TIMES. SILVERADO GAINS FINANCING FOR

  • Deposit

    FAIRBANKS GOLD MINE. AUG. 2, 1985, P. E-5.

  • Deposit

    ALASKA JOURNAL OF COMMERCE & PACIFIC RIM REPORTER

  • Deposit

    (ANCHORAGE). GRANT MINE HAS FIND. V. 12, NO. 19, 1988.

  • Deposit

    (ANCHORAGE). GRANT GOLD MINE RIDES A "SUCCESSFUL VEIN".

  • Deposit

    V. 12, NO. 27, 1988, P. 41.

General comments

Subject category Comment text
Deposit LAND USE IN AREA IS TECHNICALLY MULTIPLE, BUT A FIGHT OVER ZONING CONTINUES OVER A RESIDENTIAL OR MINING ZONING CLASS.
Environmental Factors A COMPACTED CLAY/LOESS LINER UNDERLIES THE TAILINGS POND.

Reporter information

Type Date Name Affiliation Comment
Reporter 13-JUN-97 Buckingham, David A. U.S. Bureau of Mines