Mackinaw

The Mackinaw is a copper and nickel mine located in Snohomish county, Washington at an elevation of 3,301 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: Mackinaw
Secondary: Weden Creek

Commodity

Primary: Copper
Primary: Nickel
Secondary: Cobalt
Tertiary: Gold
Tertiary: Silver
Tertiary: Vanadium
Tertiary: Uranium
Tertiary: Arsenic

Location

State: Washington
County: Snohomish
District: Monte Cristo District

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.
Administrative Organization: In Mount Baker National Forest

Holdings

Not available

Workings

Type: Surface/Underground

Ownership

Owner Name: Mackinaw Metals Co.
Years: 1956 -

Owner Name: Utility Mining Co.
Years: 1944 -

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Discovery Year: 1900
Years of Production:
Organization:
Significant: N
Deposit Size: M

Physiography

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

Mineral Deposit Model

Not available

Orebody

Form: LENSES, DISSEMINATED

Form: LENSES, DISSEMINATED

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Analytical Data: HUNTTING PROVIDES NUMEROUS ANALYSES. METALLURGICAL SAMPLES CONTAINED 2.7% CU, 1% NI, 0.05% CO, 8.9% FE, 0.9% AS, 3.9% S, 30.6% SIO2, 0.2% CAO, 0.11 OZ/TON AU, 0.3 OZ/TON AG

Materials

Ore: Niccolite
Ore: Chalcopyrite
Ore: Magnetite
Ore: Chrysocolla
Ore: Sphalerite
Ore: Chalcocite
Ore: Chloanthite
Ore: Erythrite
Ore: Garnierite
Ore: Malachite
Ore: Gold
Ore: Cubanite
Ore: Pentlandite
Gangue: Calcite
Gangue: Quartz
Gangue: Serpentine

Comments

Comment (Location): UNSURVEYED. ON WEST FORK OF WEDEN CREEK

Comment (Reserve-Resource): ABOVE FIGURE IS MAXIMUM INDICATED RESERVES, IMPLYING MAXIMUM OF 80,000 S. OF COBALT. COLE ESTIMATED 10,000 TONS OF INDICATED AND INFERRED ORE.

Comment (Production): A FEW TONS SHIPPED 1900-1910

Comment (Deposit): ORE ZONE (DIMENSIONS ABOVE) PRESENT IN 3,000 X 125 FT FRACTURE. ORE IS IN LENSES AND DISSEMINATED IN SERPENTINE IN A FRACTURE BETWEEN SERPENTINE AND ARKOSE. ORIGIN IS MAGMATIC SEGREGATION WITH LATER HYDROTHERMAL ALTERATION; THE TYPE OF DEPOSIT IS UNKNOWN

Comment (Workings): 5 ADITS

Comment (Deposit): THE OCCURRENCE OF PENTLANDITE WITHOUT ACCOMPANYING PYRRHOTITE IS UNUSUAL, IF NOT UNIQUE, AMONG NICKEL-SULFIDE ORE DEPOSITS. MILTON AND MILTON REPORTED (1958, P. 436) THAT THIS RESULTED FROM EXCEPTIONALLY HIGH NI:FE AND CU:FE RATIOS IN THE MACKINAW ORE-FORMING SOLUTIONS ; INFO.SRC : 1 PUB LIT

Comment (Deposit): MRDS RECORD M025736 HAS BEEN MERGED WITH THIS RECORD AND DELETED

References

Reference (Deposit): MILTON, CHARLES, AND MILTON, D.J., 1958, NICKEL-GOLD ORE OF THE MACKINAW MINE, SNOHOMISH COUNTY, WASHINGTON: ECONOMIC GEOLOGY, V. 53, NO. 4, P. 426-447.

Reference (Deposit): CORNWALL, H.R., 1966, NICKEL DEPOSITS OF NORTH AMERICA: U.S. GEOLOGICAL SURVEY BULLETIN 1223, P. 56-57.

Reference (Deposit): HUNTTING, M.T., 1956, INVENTORY OF WASHINGTON MINERALS - PART II, METALLIC MINERALS: WASHINGTON DIVISION OF MINES AND GEOLOGY BULLETIN 37, V. 1, P. 87.

Reference (Deposit): TABOR, R.W., FRIZZELL, V.A., JR., BOOTH, D.B., WHETTEN, J.T., WAITT, R.B., JR., AND ZARTMAN, R.E., 1982, PRELIMINARY GEOLOGIC MAP OF THE SKYKOMISH RIVER 1:100,000 QUADRANGLE, WASHINGTON: U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 82-747, SCALE1:100,000.

Reference (Production): HUNTTING

Reference (Reserve-Resource): UNPUB. COBALT REPORT

Reference (Deposit): COLE, J.W., 1944, MACKINAW METALS MINE, SNOHOMICH COUNTY, WASHINGTON: U.S. BUREAU OF MINES WAR MINERALS REPORT 156, 11 P.

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.