Helena Prospect

The Helena Prospect is a copper mine located in Snohomish county, Washington at an elevation of 2,500 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: Helena Prospect

Commodity

Primary: Copper

Location

State: Washington
County: Snohomish
District: Index District

Land Status

Not available

Holdings

Not available

Workings

Type: Surface/Underground

Ownership

Owner Name: Cornwall, William
Home Office: Index, Wa.
Years: 1912 -

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: Polymetallic veins

Orebody

Form: VEIN

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Host Rock Has Been Altered

Rocks

Name: Diorite
Role: Host
Age Type: Host Rock Unit
Age Young: Oligocene

Name: Diorite
Role: Host
Age Type: Host Rock
Age Young: Oligocene

Analytical Data

Not available

Materials

Ore: Pyrite
Ore: Bornite
Ore: Chalcopyrite
Gangue: Calcite
Gangue: Quartz

Comments

Comment (Location): NEAR NATIONAL FOREST BOUNDARY BUT OUTSIDE OF FOREST

Comment (Deposit): 4-FT-WIDE SHEAR ZONE CONSISTS OF 1-IN.-WIDE SULFIDE BANDS ALTERNATING WITH GRANODIORITE

Comment (Workings): 3 ADITS

References

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): HUNTTING, M.T., 1956, INVENTORY OF WASHINGTON MINERALS - PART II, METALLIC MINERALS: WASHINGTON DIVISION OF MINES AND GEOLOGY BULLETIN 37, V. 1, P. 85.

Reference (Deposit): BROUGHTON, W.A., 1942, INVENTORY OF MINERAL PROPLERTIES IN SNOHOMISH COUNTY, WASHINGTON: WASHINGTON DIVISION OF MINES AND GEOLOGY REPORT OF INVESTIGATIONS 6, P. 17.

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.