Seacrest

The Seacrest is a copper and molybdenum mine located in Snohomish county, Washington at an elevation of 3,999 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: Seacrest
Secondary: Silver Creek
Secondary: New York

Commodity

Primary: Copper
Primary: Molybdenum
Secondary: Nickel
Secondary: Chromium
Tertiary: Zinc
Tertiary: Lead

Location

State: Washington
County: Snohomish
District: Silver Creek 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 Snoqualmie National Forest

Holdings

Not available

Workings

Not available

Ownership

Owner Name: Duval, Cities Service
Years: 1976 -

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

Model Name: Porphyry Cu

Orebody

Form: PERVASIVE FRACTURE FILLING, RARELY DISSEMINATED

Form: PERVASIVE FRACTURE FILLING, RARELY DISSEMINATED

Structure

Type: L
Description: Transverse Fractures

Alterations

Alteration Type: L
Alteration Text: Ubiquitous Hydrothermal Alteration, Propylitic, Weak Potassic

Rocks

Name: Ultramafic Intrusive Rock
Role: Associated
Age Type: Associated Rock
Age Young: Holocene

Name: Ultramafic Intrusive Rock
Role: Associated
Age Type: Associated Rock Unit
Age Young: Holocene

Analytical Data

Analytical Data: ANALYSES OF NUMEROUS SAMPLES YIELDED MAXIMUMS OF 11.6% CU, 0.374% NI, 0.63% CR

Materials

Ore: Molybdenite
Ore: Pyrite
Ore: Chalcopyrite

Comments

Comment (Development): DEPOSIT MAY BE AMENABLE TO HEAP LEACHING

Comment (Deposit): PORPHYRY COPPER DEPOSIT IS ZONED WITH A CRUDE CU-MO CORE AND A PB-ZN PERIPHERY. DRILL CORES INTERSECTED ULTRAMAFIC ROCKS CONTAINING NI AND CU. THE PORPHYRY COPPER APPARENTLY WAS OVERPRINTED ON THE TERRANE CONTAINING THE ULTRAMAFIC DEPOSITS. STRIKE GIVEN IS TREND OF ULTRAMAFIC ROCKS

Comment (Workings): DRILL CORES

Comment (Reserve-Resource): INFERRED, SUBECONOMIC RESOURCES. LOCALIZED OCCURRENCES OF 0.5% CU ARE PRESENT IN ALTERED INTRUSIVE ROCKS

Comment (Geology): GEOLOGIC MAP INDICATES BRECCIA IS INTRUSIVE RATHER THAN VOLCANIC

Comment (Deposit): SEE ALSO MRDS RECORD MP00186

References

Reference (Deposit): CHURCH, S.E., TABOR, R.W., AND JOHNSON, F.L., 1983, MINERAL RESOURCE POTENTIAL OF THE GLACIER PEAK ROADLESS AREA, SNOHOMISH COUNTY, WASHINGTON: U.S. GEOLOGICAL SURVEY MISCELLANEOUS FIELD STUDIES MAP MF-1380-C, SCALE 1:50,000.

Reference (Deposit): JOHNSON, F.L., DENTON, D.K., IVERSON, S.R., MCCULLOCH, R.B., STEBBINS, S.A., AND STOTELMEYER, R.B., 1983, MINERAL RESOURCES OF THE GLACIER PEAK RARE II AREA (NO. L6031), SNOHOMISH COUNTY, WASHINGTON: U.S. BUREAU OF MINES OPEN-FILE REPORT MLA 75-83, P. 8, 18-19, 36.

Reference (Deposit): GRANT, A.R., 1976, REPORT OF EVALUATION, MINERAL RESOURCE ANALYSIS STUDY ON UNITED STATES FOREST SERVICE LAND, STATE OF WASHINGTON: PREPARED FOR U.S. FOREST SERVICE - REGION 6, CONTRACT NO. 004724N, P. 37.

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, 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. 22-35.

Reference (Reserve-Resource): JOHNSON AND OTHERS

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.