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  3. Mineral Resource Data System (MRDS)

Kensington

Plant in Alaska, 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. Nearby scientific data
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Mining district
  12. Mineral rights holdings
  13. Land status
  14. Ownership information
  15. Reserves and resources
  16. Workings at the site
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10185904
MRDS ID A001458
MAS/MILS ID 0021120099
Record type Site
Current site name Kensington
Alternate or previous names Eureka MS 0046, Pat# 25362, Lions Paw#3ms2015,Pat1117017,8886, Sherman Creek, Kensington MS 0045, Pat# 25362, Lions Tail Ms2015,Pat1117017,8886, Lions Pawms2015,Pat1117017blm8886, Lions Paw#1ms2015,Pat1117017,8886, Lions Paw#2ms2015,Pat1117017,8886, Lions Paw#4ms2015,Pat1117017,8886, Bat Ms2015,Pat1117017,Blm8886, Bee Ms2015,Pat1117017,Blm8886, Olga #1 Ms2015,Pat1117017,Blm8886, Olga #2 Ms2015,Pat1117017,Blm8886, Olga #3 Ms2015,Pat1117017,Blm8886, Olga #4 Ms2015,Pat1117017,Blm8886, Stanley Ms2015,Pat1117017,Blm8886, Arnold Ms2015,Pat1117017,Blm8886, Plucky Girl Fraction Same As 17, Plucky Boy Fraction Same As 17, Kensington MS 45, Pat# 25362, Eureka MS 46, Pat# 25362, Esmeralda MS 47a, Pat# 24662, Esmeralda M.S. MS 47b, Pat# 24662, Excelsior MS 48, Pat# 24662, Cumberland Ms50a&B, Pat #24662, Kensington Venture.

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -135.09676, 58.86895 (WGS84)
Elevation 564
Location accuracy 500(meters)

Site location context

Political divisions (FIPS codes)

Juneau(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Juneau D-4(quadrangle 1:63,360 scale)

Juneau NW(quadrangle 1:100,000 scale)

Juneau(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lynn Canal(hydrologic unit)

Northern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Tongass National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Public Land Survey System information

Meridian Township Range Section Fraction State
Copper River 035 S 062 E 04 Alaska

Commodities

Commodity Importance
Gold Primary
Silver Secondary

Materials information

Materials Type of material
Chalcopyrite Unknown
Gold Unknown
Pyrite Unknown
Quartz Unknown

Nearby scientific data

Ore Body (1) -135.09676, 58.86895
ListMap

Economic information

Ore body information

  • Strike N20W
    Dip 67E
    Thickness 24M
    Length 265M
    Width 98M
    Area 90HA
    Depth to top 0M
    Field Value
    Type of Orebody #1 FISSURE VEIN
    Shape of Orebody #1 LENTICULAR
    Type of Orebody #2 SHEAR ZONE
    Shape of Orebody #2 TABULAR
    Primary mode of Origin HYDROTHERMAL
    Primary Ore Control FRACTURING
    Secondary Ore Control FAULTING
    Degree of Wallrock Alter. SLIGHT
    Type of Wallrock Alter. #1 PROPYLITIC
    Strike And Dip N20W:67E
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 0
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 90
    Date of Last Modification 830321

Economic information about the deposit and operations

Operation type Underground
Development status Plant
Commodity type Metallic
Significant Yes
Discovery year 1895
Mining method Open Stope
Year of first production 1904
Plant type Beneficiation (Mill)
Plant subcategory Flotation
Milling method Flotation

Mining district

District name Juneau District

Mineral rights holdings

Type of mineral rights Patented
Type of mineral rights Located Claim

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner Couer D'Alene Mines Corp.
    Interest 100
    Home office Idaho
    Year 1996
    First year 1995
  • Type Operator
    Owner Couer Alaska Inc.
    Home office Alaska
    Year 1996
    First year 1995
  • Type Owner-Operator
    Owner Couer D'Alene Mines Corp.
    Interest 50
    Home office Idaho
    Year 1996
    Last year 1995
  • Type Owner-Operator
    Owner Echo Bay Exploration; Echo Bay Alaska, Inc; Echo Bay...
    Interest 50
    Home office Colorado
    Year 1996
    Last year 1995

Reserves and resources

  • Type In-situ
    Estimate year 1992
    Indicated 12246998mt ore
    Demonstrated 12246998mt ore
    Total resources 12246998mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 4.82 g/mt Gold Major 1992
  • Type In-situ
    Estimate year 1993
    Demonstrated 12267000mt ore
    Total resources 12267000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 4.83 g/mt Gold Major 1993
  • Type In-situ
    Estimate year 1993
    Inferred 3222000mt ore
    Total resources 3222000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 4.46 g/mt Gold Major 1993
  • Type In-situ
    Estimate year 1995
    Demonstrated 12374000mt ore
    Total resources 12374000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 4.9 g/mt Gold Major 1995
  • Type In-situ
    Estimate year 1995
    Inferred 2894000mt ore
    Total resources 2894000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 5.04 g/mt Gold Major 1995
  • Type In-situ
    Estimate year 1996
    Demonstrated 12374000mt ore
    Total resources 12374000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 4.9 g/mt Gold Major 1996
  • Type In-situ
    Estimate year 1997
    Demonstrated 12609868mt ore
    Total resources 12609868mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 4.66 g/mt Gold Major 1997
  • Type In-situ
    Estimate year 1997
    Demonstrated 8210022mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 4.11 g/mt Gold Major 1997
  • Type In-situ
    Estimate year 1996
    Demonstrated 20820000mt ore
    Total resources 20820000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 4.45 g/mt Gold Major 1996

Comments on the reserve resource information

  • AT 50 PCT CONFIDENCE LEVEL AS OF 1989.
  • ADIT RESERVES PROVEN + PROBABLE ORE ("R" RECORD 7)+ MINERALIZED ORE ("R" RECORD 8), JAN 1997, INCLUDES DILUTION AND MINE REC. ADIT CAP. BASE ON 200,000 OZ AU/YR. (ALSO "R" RECORD 9).
  • PERCENT OF TOTAL RESERVES EUREKA-KENSINGTON 19 PERCENT COMET 2 PERCENT JOHNSON 79 PERCENT. INFERRED ORE 265 M X 49 M X 24 M INDICATED ORE 265M X 49M X 24M R-RECORDS 7 & 8 RESERVES INCLUDE EXTRACTION DILUTION AND MINE RECOVERY: RECORD 8 MINERALIZED MATERIAL:

Workings at the site

  • Type of workings Underground
    Length 3116M
    Overall depth 457M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method BLOCK CAVING 10-79
    Swell Factor .56
    Percent Waste Rock 2
    Hardness of Rock HARDROCK FISSURED WITH MODERATE WATER
    Rock Characteristics ONE SYSTEM OF WEAKNESS PLANES
    Rock Support Chars. SUPPORTING
    Mine Support Chars. TIMBER
    Number of Shafts 1
    Avg. Length of Adits (m) 2134
    Number of Adits 1
    1st Condition of Workings UNKNOWN
    Capacity 545
    Capacity Units MT ORE/DAY
    Unit Production Cost 30.77
    Units of Production $/MT ORE
    Operating Days per Year 360
    Operating Shifts per Day 2
    Year of Information 1977

Reference information

Bibliographic references

  • Ownership

    ALASKA KARDEX 112-008

  • Ownership

    ALASKA KARDEX 112-009

  • Ownership

    ALASKA KARDEX 112-010

  • Ownership

    MINING RECORD, V 106/N 21, 5/24/95, P.3.

  • Reserve-Resource

    DGGS IC 35, P. 10, 1992

  • Reserve-Resource

    ECHO BAY MINES CORP., 1993 ANNUAL REPORT, P.58.

  • Reserve-Resource

    COEUR D'ALENE MINES CORP., 1994 10-K, P.12.

  • Reserve-Resource

    MINING RECORD, V 106/N 29, 7/19/95, P.1.

  • Reserve-Resource

    COEUR D'ALENE MINES CORP., 1995 10-K, P.12.

  • Reserve-Resource

    COEUR D'ALENE MINES CORP., 1996 FORM 10-K, P19.

  • Deposit

    GENERAL REFERENCES

  • Deposit

    REDMAN NEWSPAPER 1987pp. 20, 35-36

  • Deposit

    RANDOL MINING DIRECTORY, 1993/94, P.138.

  • Deposit

    SKILLINGS', V 83/N 47, 11/19/94, P.11.

  • Deposit

    RANDOL MINING DIRECTORY, 1994/95, P.194.

  • Deposit

    MINING RECORD, V 106/N 17, 4/26/95, P.6.

  • Deposit

    GOLD GAZETTE, V 3/N 96, 5/8/95, P.43.

  • Deposit

    AMERICAN METAL MARKET, V 103/N 93, 5/15/95, P.2.

  • Deposit

    AMERICAN METAL MARKET, V 103/N 133, 7/13/95, P.4.

  • Deposit

    THE MINING RECORD, VOL 107, #36?, SEPT, 4, 1996, P37.

  • Deposit

    THE MINING RECORD, VOL 107, #40, OCT., 2, 1996, P3.

  • Deposit

    THE MINING RECORD, VOL 107, #44, OCT., 30, 1996, P6.

  • Deposit

    THE MINING RECORD, VOL 108, #5, JAN ., 29, 1997, P9.

  • Deposit

    THE MINING RECORD, VOL 108, #10, MARCH 5, 1997, P3.

  • Deposit

    SKILLINGS MINING REVEIW, VOL 86, #10, MARCH 8, 1997, P17.

  • Deposit

    COEUR D' ALENE MINES CORP. 1996 FORM 10-K, PP. 18-22.

  • Deposit

    AFOC REFERENCE NOTES:

  • Deposit

    MSHA.DBF; 03/95.

  • Deposit

    B225 p. 38

  • Deposit

    B259d p. 54

  • Deposit

    B284e pp. 32-33

  • Deposit

    B287 p. 137

  • Deposit

    B314d p. 57

  • Deposit

    B446 pp. 39-44

  • Deposit

    B480d pp. 67-68

  • Deposit

    B520c p. 26

  • Deposit

    B542c p. 32

  • Deposit

    B592d p. 59

  • Deposit

    B622c p. 41

  • Deposit

    B622f p. 101

  • Deposit

    B642d pp. 77-78

  • Deposit

    BMB142 pp. 36, 52

  • Deposit

    BMB153 p. 24

  • Deposit

    B662d pp. 77, 82-83

  • Deposit

    B712a p. 30

  • Deposit

    B800 pp. 317-318, 345-346

  • Deposit

    B813a p. 14

  • Deposit

    B824a p. 16

  • Deposit

    B864A p. 17

  • Deposit

    B868A p. 16

  • Deposit

    B880A p. 17

  • Deposit

    B897A p. 17

  • Deposit

    B910A p. 19

  • Deposit

    B933A p. 17

  • Deposit

    ADGS AR 1966a p. 60

  • Deposit

    B1246 pp. 159-160

  • Deposit

    MF435

  • Deposit

    OF81-122

  • Deposit

    AMR 81-82

  • Deposit

    MTA 82 No. F-15

  • Deposit

    SR33 p. 12

  • Deposit

    SR38 p. 14

  • Deposit

    TABLE REFERENCES:

Comments on the references

  • USAF, 1972, AF PRICING GUIDE, AFP 88-16, 78P.

General comments

Subject category Comment text
Deposit PEFR RECEIVED OCT.1989 PROJECT STILL IN PERMITTING STAGE AS OF 1990. PROJECT RECIEVED FIRST OF THREE PERMITS NEEDED FOR DEVELOPMENT TO BEGIN. PRODUCTION CAN BEGIN AS EARLY AS 1998. AS OF OCT 1996 PROJECT IN FINAL PERMITTING STAGE CONSTRUCTION STAGE EXPECTED OVER NEXT 2 YRS. 1897 DISCOVERED; TRAM BUILT; MINING BEGAN. 1898-9 4,500 TONS WERE MINED.

Reporter information

Type Date Name Affiliation Comment
Reporter 27-AUG-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.

External references

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.