Jumbo Mountain

The Jumbo Mountain is a cobalt, nickel, and copper mine located in Snohomish county, Washington at an elevation of 3,399 feet.

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: Jumbo Mountain

Commodity

Primary: Cobalt
Primary: Nickel
Primary: Copper

Location

State: Washington
County: Snohomish
District: Darrington District

Land Status

Land ownership: National Wilderness
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.
Administrative Organization: In Boulder River Wilderness In Mount Baker National Forest

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Northern Cascade Mountains

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrrhotite
Ore: Chalcopyrite
Ore: Pentlandite

Comments

Comment (Reserve-Resource): RAW PROSPECT; NO RESERVES REPORTED

Comment (Deposit): MRDS RECORD US53007 HAS BEEN MERGED WITH THIS RECORD AND DELETED

Comment (Geology): GEOL.DESC: DUNITE AND GABBRO HAVE INTRUDED TERTIARY QUARTZITE AND ARGILLITE. THE DUNITE CARRIES NICKEL IN DISSEMINATED PYRRHOTITE AND IN OLIVINE. HIGHER CONCENTRATIONS OF PYRRHOTITE, PENTLANDITE AND (LATER) CHALCOPYRITE ARE IN SHEAR ZONES, IN ALTERED DUNITE, UP TO 30 FT. WIDE ALONG DUNITE-QUARTZITE CONTACTS. UP TO 3% NICKEL REPORTED. COBALT NOT MENTIONED BUT ESTIMATED(BY J.S.VHAY)TO BE PRESENT IN AMOUNTS AT ABOUT 1/20 TH OF THE NI& CU

Comment (Deposit): DESPITE THE FACT THAT THE MICKELIFEROUS SULFIDES OCCUR IN THE DUNITE DIKES BOTH AS DISSEMINATIONS AND AS CONCENTRATIONS ALONG SHEARED WALLS, MILLS(1960)FAVORED THE YOUNGER GABBRO BODY AS THE SOURCE OF THE MINERALIZING SOLUTION ; INFO.SRC : 1 PUB LIT

Comment (Location): UNSURVEYED

References

Reference (Deposit): MILLS, J.W., 1960, MINING ENGINEERING, V.12, NO. 3, MARCH, 1960, P. 272-274.

Reference (Reserve-Resource): UNPUBLISHED COBALT REPORT

Reference (Deposit): TABOR, R.W., BOOTH, D.B., VANCE, J.A., FORD, A.B., AND ORT, M.H., 1988, PRELIMINARY GEOLOGIC MAP OF THE SAUK RIVER 30 BY 60 MINUTE QUADRANGLE, WASHINGTON: U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 88-692, SCALE 1:100,000.

Washington Gold

"Where to Find Gold in Washington" looks at the density of modern placer mining claims along with historical gold mining locations and mining district descriptions to determine areas of high gold discovery potential in Arizona. Read more: Where to Find Gold in Washington.