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Knob Hill Mine & Plant

Plant in Ferry county in Washington, 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. Production statistics
  16. Reserves and resources
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. Reporter information

Geologic information

Identification information

Deposit ID 10277450
MRDS ID M056035
MAS/MILS ID 0530190084
Record type Site
Current site name Knob Hill Mine & Plant
Alternate or previous names Knob Hill Mine and Plant-Republic, Knob Hill Mines, Blaine Republic, Republic Unit
Related records 10301483, 10041109

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -118.75864, 48.67294 (WGS84)
Elevation 945
Location accuracy 10(meters)

Site location context

Political divisions (FIPS codes)

Ferry(county)

Washington(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Storm King Mountain(quadrangle 1:24,000 scale)

Republic(quadrangle 1:100,000 scale)

Okanogan(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Sanpoil(hydrologic unit)

Upper Columbia(hydrologic accounting unit)

Upper Columbia(hydrologic subregion)

Pacific Northwest(hydrologic region)

Geographic areas

Country State County
United States Washington Ferry

Public Land Survey System information

Meridian Township Range Section Fraction State
Willamette 037 N 032 E 27 Washington

Commodities

Commodity Importance
Gold Primary
Silver Primary

Materials information

Materials Type of material
Electrum Unknown
Silver Unknown
Stephanite Unknown

Nearby scientific data

Main Entrance (1) -118.75864, 48.67294
ListMap

Economic information

Ore body information

  • Strike N45W
    Dip 55E
    Thickness 500M
    Length 1250M
    Width 14.5M
    Area 1130HA
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 FISSURE VEIN
    Shape of Orebody #1 TABULAR
    Primary mode of Origin HYDROTHERMAL
    Primary Ore Control FRACTURING
    Secondary Ore Control FAULTING
    Degree of Wallrock Alter. SLIGHT
    Type of Wallrock Alter. #1 UNKNOWN
    Strike And Dip N45W:55E
    Total Surface Area (HA) 1130
    Reclaimed Surface Area (HA) 1130
    Date of Last Modification 970625

Economic information about the deposit and operations

Operation type Underground
Development status Plant
Commodity type Metallic
Deposit size Medium
Significant Yes
Discovery year 1896
Mining method Filled Stopes - Horiz Cut and Fill W/Tailings
Year of first production 1899
Plant type Leach
Plant subcategory Flotation
Milling method Flotation

Mining district

District name Republic

Mineral rights holdings

Type of mineral rights Patented
Type of mineral rights Located Claim

Land status

Ownership category Private

Ownership information

  • Type Owner-Operator
    Owner Hecla Mining Co.
    ID 4500365
    Interest 100
    Home office Idaho
    Year 1983
    First year 1983

Production statistics

  • Year 1978
    Description Au And Ag Ore Mined (4/78-12/78) 21599 Mt Ore
  • Year 1979
    Description Au And Ag Ore Mined 39800 Mt Ore
  • Year 1980
    Description Au And Ag Ore Mined 56900 Mt Ore
  • Year 1981
    Description Au And Ag Ore Mined 53300 Mt Ore
  • Year 1982
    Description Au And Ag Ore Mined 51300 Mt Ore
  • Year 1984
    Description Ore Mined 59000 Mt Ore/Year
  • Year 1985
    Description Ore Mined 57000 Mt Ore/Year
  • Year 1986
    Description Ore Mined 1179000 Mt Ore/Year
  • Year 1987
    Description Ore Mined 1486000 Mt Ore/Year
  • Year 1993
    Description Gold Production 49601 T Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 1542763.76g
  • Year 1993
    Description Silver Priduction 276688 T Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Silver Silver 8605959.95g

Comments on the production information

  • IN 1995 THE FACILITY WAS CLOSED AND RECLAMATION BEGAN. THIS INCLUDED THE GOLDEN PROMISE MAS SEQ# 0530190460 & KNOB HILL DEPOSITS. THE TAILIGS POND IS BEING DEWATERED, 27 SHAFTS, STOPES AND ADITS/PORTALS ARE BEING CLOSED. COMPANY WILL SUBMIT FINAL CLOSURE PLAN IN 1996. THE ADJACENT PROPERTY, GOLDEN EAGLE, MAS SEQ 0530190073 & 0461 WAS OPTIONED TO SANTA FE PACIFIC GOLD. ALSO LISTED UNDER MINERAL PROPERTY FILE #30.5 AND USGS ID # M056017 1988 AU PROD. = 70,000 OZ. 1989 AU PROD. = 74,335 OZ FROM MILLING OF 75,290 MT ORE. 1989 RESERVE = 334,000 OZ CONT. AU.

Reserves and resources

  • Type In-situ
    Estimate year 1991
    Demonstrated 364100mt ore
    Total resources 364100mt ore
    Commodity Subtype Grade units Group Importance Year
    Silver Ag 109.71 g/mt Silver Major 1991
    Gold Au 18.171 g/mt Gold Major 1991
  • Type In-situ
    Estimate year 1991
    Demonstrated 374000mt ore
    Total resources 374000mt ore
    Commodity Subtype Grade units Group Importance Year
    Silver Ag 113.1 g/mt Silver Major 1991
    Gold Au 27.8 g/mt Gold Major 1991

Comments on the reserve resource information

  • RESOURCE INFORMATION WAS ACQUIRED FROM PERSONAL COMMUNICATIONS AND HECLA MINING CO., 1986 THIRD QUARTER REPORT. ESTIMATED ORE RESERVES ARE BASED UPON PAST YEARLY REPORTED RESERVE FIGURES. TYPICALLY, ONLY LIMITED AMOUNTS OF RESERVES ARE PROVEN EACH YEAR, ONLY APPROXIMATELY ENOUGH TO REPLACE PRODUCTION.

Workings at the site

  • Type of workings Underground
    Overall depth 535M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ESTIMATE
    Mining Method HORIZ CUT & FILL W/TAILINGS 10-60
    Percent Waste Rock 99.9
    Hardness of Rock UNKNOWN
    Rock Characteristics MULTIPLE SYSTEMS OF WEAKNESS PLANES
    Rock Support Chars. UNSUPPORTING MAY SLOUGH
    Mine Support Chars. OTHER
    Number of Adits 13
    Capacity 200
    Capacity Units MT ORE/DAY
    Unit Production Cost 93
    Operating Days per Year 250
    Year of Information 1983

Comments on the workings information

  • STATE HAZARDOUS SUBSTANCE SITE (CI) AFFECTED SURFACE WATER, METALS AS POLLUTANT IN IMPOUNDMENT, CONFIRMED. CONTACT: ALANA SCOTT, (509) 775-3241.

Comments on other economic factors

  • THE FLOTATION CONCENTRATES ARE PRESENTLY SOLD TO J. ARON AND COMPANY OF NEW YORK, WHO IN TURN HAS CONTRACTED METALLURGIE OVERPELT, S.A., HOBOKEN, BELGIUM FOR FINAL REFINING. ALL CONCENTRATES ARE SHIPPED TO BELGIUM WHERE 999+ FINE GOLD AND 999+ FINE SILVER ARE PRODUCED. DORE BARS FROM KNOB HILL ARE BELIEVED SENT TO HANDY AND HARMON IN CONNECTICUT FOR FINAL REFINING. HANDY AND HARMON LIKEWISE PRODUCE 999+ FINE GOLD AND 999+ FINE SILVER PRODUCTS.

Reference information

Bibliographic references

  • Deposit

    WASHINGTON DEPT. OF ECOLOGY TOXIC CLEANUP PROGRAM. AFFECTED

  • Deposit

    MEDIA AND CONTAMINATION REPORT, APR. 7, 1993.

  • Deposit

    MINING JOURNAL-PRESS. REPUBLIC WASHINGTON NEEDS CAPITAL.

  • Deposit

    VOL. 119, NO.9.

  • Deposit

    COLVILLE ENG CO, FERRY COUNTY POWER SURVEY, FERRY CO PUD RPT

  • Deposit

    PP 87-91.

  • Deposit

    BOM INFORMATION CIRCULAS #48, P16.

  • Deposit

    QUARTER RESULTS. AUG 5, 1981, P. 3.

  • Deposit

    ENGINEERING AND MINING JOURNAL. KNOB HILL MINE PROSPERS ON

  • Deposit

    NEWER ORE DISCOVERIES. MARCH 1948, P. 56-59.

  • Deposit

    COOPER, CORWIN L. MINING AND MILLING METHODS AND COSTS AT

  • Deposit

    KNOB HILL MINE. BUMINES IC 7123, JUNE 1940, 29 P.

  • Deposit

    THE MINING RECORD.HECLA AND DAY MERGER-PREMIER SILVER MINING

  • Deposit

    COMPANY. DEC. 16, 1981, P. 7.

  • Deposit

    THE MINING RECORD, LUCKY FRIDAY TOP GOLD PRODUCER. NOV 3,

  • Deposit

    1982.

  • Deposit

    THE MINING RECORD. THE REPUBLIC PM DISTRICT, WA. MAR 23,1983

  • Deposit

    THE MINING RECORD. HECLAS MINING REPORTS LOSS FOR SECOND

  • Deposit

    HECLA MINING COMPANY-ANNUAL REPORT, 1980.

  • Deposit

    HECLA MINING COMPANY-ANNUAL REPORT, 1981.

  • Deposit

    HECLA MINING COMPANY 1995 ANNUAL REPORT, P15.

  • Deposit

    STATE OF WASHINGTON BUL. 37, PART 2, P 124.

  • Deposit

    GOLD EXTRACTION COST $160/OZ, SPOKESMAN-REVIEW P.C1,1/11/87

  • Deposit

    1986 PRODUCTION 40000 OZ AU, S-R P.C1, 1/11/87.

  • Deposit

    GOLDEN PROMISE SHAFT IS 1300 FT DEEP,TOOK 8 MONTHS TO SINK,

  • Deposit

    AND COST $2.2 MILLION , S-R P.C1, 1/11/87.

  • Deposit

    THROUGH 1985 4.3 MILLION ST OF ORE MINED, AT 0.557 OZ AU/ST,

  • Deposit

    AND 3.23 OZ AG/ST, WALLACE MINER P.3, 12/18/86.

  • Deposit

    RANDOL MINING DIRECTORY, 1996/97, P326.

Reporter information

Type Date Name Affiliation Comment
Reporter 25-JUN-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.

Current status (per MSHA)

StatusAbandoned since 01/20/1997
MSHA mine ID4500365
Mine name (MSHA)REPUBLIC UNIT
Current operatorHecla Mining Company
Mine typeUnderground (Metal / non-metal)

MSHA cross-reference per the original MRDS record. Mine status and operator reflect MSHA's last published Mines export (February 2025); MSHA's public bulk feed has been unavailable since, so this may be out of date. See the Mine Data Retrieval System for current status.

Open MSHA's Mine Data Retrieval System for inspections, accidents, and violations for this mine.

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