Knob Hill Mine

Ferry County, Washington, United States

SilverGoldCopperAntimonySeleniumTelluriumArsenic

⌖ Show on map USGS source ↗

Commodities

PrimarySilver, Gold

TertiaryCopper, Antimony, Selenium, Tellurium, Arsenic

Commodity typeM

Deposit

Model150: Epithermal vein, Comstock

Deposit sizeM

Ore controlGold Deposition Is Believed To Be Genetically Connected With The Intrusion Of The Quartz Latite Porphyry Stock. Dextral Strike Slip Movement On The Eureka Fault System Is Believed To Have Created The Shears And Dilational Zones Which Were Subsequently Mineralized. Flexures Or "Rolls" In The Veins From Steeper To Flatter Dips Are Very Important Controls Of High Grade Ore. Ore Is Hosted Mainly By Sanpoil Volcanics, With Minor Amounts Of Ore In The Knob Hill Stock.

Materials

Ore mineralsElectrum, Naumannite, Tetrahedrite

GangueBarite, Calcite, Chalcedony, Chalcopyrite, Fluorite, Gypsum, Marcasite, Opal, Pyrite, Quartz, Realgar, Sericite, Stibnite

Geology

Host rockQuartz Latite · Sanpoil Volcanics;Knob Hill Stock

StructureThe Republic Graben Trends Northeasterly And Is Bounded On The West By The Bacon Creek Fault And On The East By The Sherman Creek Fault., Eureka Fault System.

AlterationPropylitization And Silicification. See Geology Comments.

Economic & production

Development statusProducer

Production years1904; 1910-1926; 1930-1935; 1937-PRESENT (11/92)

First production1904

Discovery year1904

Identification

Deposit ID10041109

MRDS IDM056035

Alternate namesAlpine, Veins: Knob Hill, Stewart, Golden Promise, South Cross, Bailey

RegionNA

Data scoreA

Coordinates48.67262, -118.75947

References

USGS BULL 1216, PG 114HECLA MINING CO., 1991, ANNUAL REPORT FOR 1990.DAYTON, S.H., 1988, HECLA'S REPUBLIC UNIT: SMALL MINE PACKS A BIG EARNINGS PUNCH, ENGINEERING AND MINING JOURNAL, DECEMBER, P. 34-39.LASMANIS, R., WASHINGTON GEOLOGIC NEWSLETTER, VOL. 17, NO. 3, P. 9-11.LINDGREN, W. AND BANCROFT, H., 1914, THE ORE DEPOSITS OF NORTHEASTERN WASHINGTON, USGS BULLETIN 550, P. 133-166.UMPLEBY, J., 1910, GEOLOGY AND ORE DEPOSITS OF REPUBLIC MINING DISTRICT, WASHINGTON GEOLOGICAL SURVEY BULLETIN NO. 1.SALZER, T.A., 1990, EPITHERMAL GOLD-SILVER DEPOSITS, REPUBLIC DISTRICT, FERRY COUNTY, WASHINGTON, ORAL PRESENTATION AT 96TH ANNUAL NORTHWEST MINING ASSOCIATION CONVENTION, SPOKANE, WA, DECEMBER 7.MARTIN, W., 1988, THE GEOCHEMISTRY AND PETROGRAPHY OF SOME VEINS AND WALLROCKS HOSTING GOLD AND SILVER IN THE REPUBLIC DISTRICT, NORTHEASTERN WASHINGTON, UNPUBLISHED M.S. THESIS, EASTERN WASHINGTON UNIVERSITY.FULL, R. P. AND GRANTHAM, R. M., 1968, ORE DEPOSITS OF THE REPUBLIC MINING DISTRICT, FERRY COUNTY, WASHINGTON, IN RIDGE, J. D., ED., ORE DEPOSITS OF THE UNITED STATES 1933-1967 - THE GRATON SALES VOLUME, THE AMERICAN INSTITUTE OF MINING, METALLURGICAL, AND PETROLEUM ENGINEERS, INC., NEW YORK, P. 1481-1494.1986-1990 ANNUAL PRODUCTION: HECLA MINING CO., 1991, ANNUAL REPORT FOR 1990. DAYTON, S.H., 1988, HECLA'S REPUBLIC UNIT: SMALL MINE PACKS A BIG EARNINGS PUNCH, ENGINEERING AND MINING JOURNAL, DECEMBER, P. 34-39. LASMANIS, R., WASHINGTON GEOLOGIC NEWSLETTER, VOL. 17, NO. 3, P. 9-11.