The Index Group is a copper mine located in Skamania county, Washington at an elevation of 3,619 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: 3,619 Feet (1,103 Meters)
Commodity: Copper
Lat, Long: 46.34417, -122.09417
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.
Index Group MRDS details
Site Name
Primary: Index Group
Secondary: Index Nos. 1-12
Commodity
Primary: Copper
Secondary: Silver
Secondary: Gold
Location
State: Washington
County: Skamania
District: St. Helens District - Ryan Lake Area
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 Gifford-Pinchot National Forest; Southern Part Of Claim Area Also Within Mount St. Helens National Volcanic Monument
Holdings
Type: Patented
Workings
Type: Underground
Ownership
Owner Name: Duval Corp
Years: 1980 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
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: Faulted, brecciated, STRINGERS AND POCKETS)
Structure
Type: L
Description: Faulting And Brecciation
Alterations
Not available
Rocks
Name: Diorite
Role: Host
Age Type: Host Rock Unit
Age Young: Miocene
Name: Diorite
Role: Host
Age Type: Host Rock
Age Young: Miocene
Analytical Data
Analytical Data: 2 SELECT SAMPLES FROM THE ADITS ASSAYED 1.84, 2.10 OZ/TON Au, 1.0, 1.1 OZ/TON Ag, and a trace, 0.2% Cu. (Moen, 1977, p. 26)
Materials
Ore: Pyrite
Ore: Chalcopyrite
Comments
Comment (Deposit): WELL-DEFINED VEINS WERE NOT DISCOVERED ON THE PROPERTY WHEN THE ORIGINAL UNDERGROUND WORK WAS UNDERTAKEN. DEPOSIT MAY BE PERIPHERAL PART OF PORPHYRY COPPER DEPOSIT RATHER THAN ASSOCIATED POLYMETALLIC VEINS.
Comment (Location): 2.5 MI NORTHWEST OF CHICAGO GROUP ON NORTH-FACING SLOPE OF BLACK MOUNTAIN. LOCATION MAP AVAILABLE, MOEN (1977), P.17, p. 20 HAS MAP OF THE 12 PATENTED CLAIMS.
Comment (Development): ALL UNDERGROUND WORK ON THE CLAIMS WAS DONE BETWEEN 1901 AND 1905 BY CASCADIA MINING & DEVELOPEMENT CO. DUVAL DRILLED THE NORTHERN PART OF THE PROPERTY IN 1973 AS PART OF THEIR MARGARET MINE PROJECT
Comment (Workings): 130 FT ADIT WITH TWO 50-FT HEADINGS
Comment (Geology): REFERENCE INDICATES TERTIARY VOLCANIC ROCKS AS HOSTING DEPOSIT BUT RECENT MAPPING SHOWS CLAIM AREA WITHIN THE SPIRIT LAKE PLUTON
Comment (Deposit): SEE ALSO MRDS RECORD M700154
References
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. 77.
Reference (Deposit): LANDES, HENRY, THYNG, W.S., LYON, D.A., AND ROBERTS, MILNOR, 1902, THE METALLIFEROUS RESOURCES OF WASHINGTON, EXCEPT IRON: WASHINGTON GEOLOGICAL SURVEY ANNUAL REPORT FOR 1901, V. 1, PT. 2, P. 134.
Reference (Deposit): MOEN, W.S., 1977, ST. HELENS AND WASHOUGAL MINING DISTRICTS OF THE SOUTHERN CASCADES OF WASHINGTON: WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES INFORMATION CIRCULAR 60, P. 17, 26.
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.
