Kensington Mine

The Kensington Mine is a gold mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Kensington Mine

Commodity

Primary: Gold
Tertiary: Lead
Tertiary: Silver
Tertiary: Copper

Location

State: Alaska
District: Juneau/Berner'S Bay

Land Status

Land ownership: National Forest
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Type: Surface/Underground

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Producer
Operation Type: Unknown
Year First Production: 1897
Year Last Production: 1904
Discovery Year: 1891
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Form: OTHER: ELLIPTICAL

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Alteration Minerals In Diorite: Chlorite, Epidote, Sericite, Locally K-Spar

Rocks

Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Name: Diorite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Pliocene

Analytical Data

Analytical Data: METZ AND WIEBMER, 1977 UNPUB. REPORT
Analytical Data: 0.208-0.29 OZ/TON AU FOR ASSAY BOUNDED AREAS OF 50-300 FT BY 75 TO 150 FT

Materials

Ore: Chalcopyrite
Ore: Galena
Gangue: Quartz
Gangue: Albite

Comments

Comment (Deposit): STOCKWORK OF IRREGULAR 1 IN-1 FT QUARTZ VEINS IN HIGH ANGLE ZONES OF SHEARED AND CHLORITIZED DIORITE; ORE BODY IS ELLIPTICAL IN PLAN VIEW, 80 BY 160 FT WITH LONG AXIS TRENDING N-S; VERTICAL EXTENT OVER 1000 FT; SULFIDES: DOMINANTLY PYRITE, SOME CHALCOPYRITE AND RARE GALENA; PYRITE VARIES FROM DISSEMINATED EUHEDRAL CRYSTALS TO MASSIVE VEINS UP TO 1 FT WIDE

Comment (Workings): 5000 FT KENSINGTON ADIT CONNECTIS WORKINGS OF THE KENSINGTON, JOHNSON, EUREKA AND NORTHERN BELLE VEINS; THE KENSINGTON ORE BODY WAS INTERSECTED 1950 FT FROM THE PORTAL, 800 FT BELOW SURFACE, AND WAS EXPLORED BY 640 FT OF DRIFTS IN 1904; MINED FROM SURFACE AND SHALLOW WORKINGS; ADIT IS OPEN

Comment (Commodity): MODE OF OCURRENCE OF AU UNKNOWN; AU RECOVERY ONLY 5% BY AMALGANATION; PYRITE ID DOMINANT SULFIDE

Comment (Production): 12000 TONS MINED BEFORE 1901; AU RECOVERY WAS ONLY 5% BY AMALGAMATION, 62% BY GRAVITY CONCENTRATION, 33% LOST IN TAILINGS

Comment (Development): MINING 1897-1904; KENSINGTON ADIT EXTENDED TO UNDERCUT HEARBY ORE BODIES IN 1904, AND 1911-1916; KENSINGTON, BEAR AND COMET CONSOLIDATED IN 1915; SEVERAL UNSUCCESSFUL ATTEMPTS TO REOPEN MINE BEFORE WWII; RECENT ACTIVITY: DRILLED IN 1984 BY PLACID OIL CO., TOTAL OF 5,400 FT IN 15 SURFACE HOLES; PLUS SOME ROCK AND GEOCHEMICAL SAMPLING

Comment (Geology): SEE JUALIN MINE GEOLOGY COMMENTS

Comment (Location): LOCATION IS PRINTED ON JUNEAU D-4 QUAD., 1: 63360 TOPOGRAPHIC SERIES; PROBABLY THE PORTAL OF THE KENSINGTON ADIT; ORE BODY LIES TO THE E. LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Comment (Reserve-Resource): METZ AND WIEBMER, 1977 UNPUB. REPORT

Comment (Deposit): SEE ALSO: JOHNSON, EUREKA, COMET, JUALIN ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

References

Reference (Deposit): USGS BULL 287, P. 137

Reference (Deposit): USGS BULL 284, P. 32-33

Reference (Deposit): USGS BULL 446, P. 40-42

Reference (Deposit): USGS BULL 592, P. 59

Reference (Deposit): USGS BULL 1246, P. 159-160

Reference (Deposit): METZ, PAUL A. AND WIEBMER, JOHN D., 1977, M.I.R.L. SUMMARY FILE REPORT; EUREKA, KENSINGTON, COMET, JOHNSON AND JUALIN MINES, BERNER'S BAY JUNEAU DISTRICT, ALASKA: UNPUBLISHED MINING FEASIBILITY STUDY SUBMITTED TO U.S.B.M.

Reference (Deposit): USGS OFR85-717, NO. J093

Reference (Other Database): BAG-OFR-85-717-093

Reference (Deposit): ADGGS SR 38, P. 14

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