Index Bornite Prospect

The Index Bornite Prospect is a silver and copper mine located in Snohomish county, Washington at an elevation of 2,001 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: Index Bornite Prospect
Secondary: Index

Commodity

Primary: Silver
Primary: Copper

Location

State: Washington
County: Snohomish
District: Index 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: Probably At Least Partly Within Mount Baker-Snoqualmie National Forest

Holdings

Not available

Workings

Type: Surface/Underground

Ownership

Owner Name: Index Bornite Copper Mining Co.
Years: 1917 -

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: VEINLETS

Structure

Type: L
Description: Intense Fracturing

Alterations

Alteration Type: L
Alteration Text: Potassic (Biotite). Volcanic Rocks Intensely Pyritized And Hornfelsed. Intrusion Is Pyritized.

Rocks

Not available

Analytical Data

Analytical Data: ASSAYS GAVE 11.1-58.9% CU, 3.8-8.6 OZ/TON AG (PRESUMABLY THESE WERE HIGH-GRADE SAMPLES)

Materials

Ore: Bornite
Ore: Chalcopyrite
Ore: Chalcocite
Gangue: Calcite
Gangue: Quartz

Comments

Comment (Location): ON LEWIS CREEK

Comment (Deposit): ALONG CONTACT OF SNOQUALMIE BATHOLITH AND TERTIARY VOLCANIC ROCKS. MAY BE HIGH-LEVEL REPRESENTATION OF POSSIBLE PORPHYRY SYSTEM. MINERALIZED AREA COVERS 1.5 SQUARE MI. SULFIDE MINERALS OCCUR AS IMPREGNATIONS AND BANDS TO 4 IN. WIDE IN MINERALIZED SHEAR ZONE

Comment (Workings): SHAFT, 2 ADITS

References

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

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. 47.

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. 86.

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.