The North Fork is a copper mine located in King county, Washington at an elevation of 3,501 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
Elevation: 3,501 Feet (1,067 Meters)
Commodity: Copper
Lat, Long: 47.689, -121.66200
Map: View on Google Maps
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.
North Fork MRDS details
Site Name
Primary: North Fork
Secondary: Weyerhaeuser Land Prospect
Commodity
Primary: Copper
Location
State: Washington
County: King
Land Status
Land ownership: Private
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
Type: Patented
Workings
Not available
Ownership
Owner Name: Weyerhaeuser Co.
Percent: 100.0
Home Office: Washington
Info Year: 1974
Production
Not available
Deposit
Record Type: Deposit
Operation Category: Prospect
Deposit Type: Porphyry copper
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
Model Name: Porphyry Cu
Orebody
Form: STOCKWORK
Structure
Type: L
Description: Fractures
Alterations
Alteration Type: L
Alteration: Propylitic
Alteration Type: L
Alteration: Argillic
Alteration Type: L
Alteration: Potassic
Alteration Text: Potassic, Argillic, Propylitic
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Pyrrhotite
Ore: Chalcopyrite
Ore: Pyrite
Ore: Bornite
Gangue: Magnetite
Comments
Comment (Geology): SAID TO BE SIMILAR TO THE NORTH FORK DEPOSIT. INTRUSIVE ROCKS OF HOLLISTER ARE MAPPED AS ROCKS OF SNOQUALMIE BATHOLITH BY TABOR AND OTHERS. VOLCANIC ROCKS ARE CALLED VOLCANIC ROCKS OF MOUNT PERSIS BY TABOR AND OTHERS. VOLCANIC ROCKS ARE UNDERLAIN BY ROCKS OF THE WESTERN MELANGE BELT
Comment (Location): PARTLY WITHIN SOUTH FORK TOLT WATERSHED
Comment (Development): DEPOSIT HAS BEEN DRILLED ONLY
Comment (Workings): 26 DRILL HOLES
References
Reference (Reserve-Resource): HOLLISTER
Reference (Deposit): Washington Division of Mines and Geology IC 48, 1973, P. 19.
Reference (Geology): TABOR, R.W., FRIZZELL, V.A., JR., BOOTH, D.B., WAITT, R.B., JR., WHETTEN, J.T., AND ZARTMAN, R.E., 1993, GEOLOGIC MAP OF THE SKYKOMISH RIVER 30- by 60-MINUTE QUADRANGLE, WASHINGTON: U.S. GEOLOGICAL SURVEY MISCELLANEOUS INVESTIGATION SERIES MAP I-1963, SCALE 1:100,000.
Reference (Deposit): HOLLISTER, V.F., 1979, PORPHYRY COPPER-TYPE DEPOSITS OF THE CASCADE VOLCANIC ARC, WASHINGTON: MINERALS SCIENCE AND ENGINEERING, V. 11, P. 32-33.
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.
