Boulder Group

The Boulder Group is a silver, copper, zinc, cobalt, arsenic, gold, and nickel mine located in Grant county, Oregon.

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

Name: Boulder Group  

State:  Oregon

County:  Grant

Elevation:

Commodity: Silver, Copper, Zinc, Cobalt, Arsenic, Gold, Nickel

Lat, Long: 44.55333, -118.62528

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.


Satelite image of the Boulder Group

Boulder Group MRDS details

Site Name

Primary: Boulder Group
Secondary: Cobalt Gold Mines Inc.
Secondary: Boulder Ridge Mining Co.


Commodity

Primary: Silver
Primary: Copper
Primary: Zinc
Primary: Cobalt
Primary: Arsenic
Primary: Gold
Primary: Nickel


Location

State: Oregon
County: Grant
District: Quartzburg


Land Status

Administrative Organization: Malheur Natioal Forest


Holdings

Not available


Workings

Not available


Ownership

Not available


Production

Not available


Deposit

Record Type: Site
Operation Category: Occurrence
Deposit Type: Vein
Operation Type: Unknown
Years of Production:
Organization:
Significant: N


Physiography

General Physiographic Area: Intermontane Plateaus
Physiographic Province: Columbia Plateau
Physiographic Section: Blue Mountain Section


Mineral Deposit Model

Not available


Orebody

Not available


Structure

Not available


Alterations

Not available


Rocks

Not available


Analytical Data

Analytical Data: ORE ASSAYS 8 % COBALT, 2 % COPPER, $2 GOLD TO THE TON ( 1898


Materials

Ore: Chalcopyrite
Ore: Pyrrhotite
Ore: Sphalerite
Ore: Pyrite
Ore: Smaltite
Gangue: Quartz
Gangue: Calcite


Comments

Comment (Location): SW 1/4

Comment (Workings): DEVELOPED BY DRIFTS AND CROSSCUTS ON TWO LEVELS TOTALLING 1000 FT.

Comment (Geology): GEOL.DESC: COUNTRY ROCK IS CUT BY A FEW DIORITIC DIKES AND BY FAULTS AND FISSURES THAT TREND GENERALLY N 70 E TO S 70 E AND DIP STEEPLY SOUTHWARD. MINERALIZATION CONSISTED OF SILICIFICATION AND IMPREGNATION OF THE WALLS OF FAULT WITH SULFIDES AND ARSENIDES.

Comment (Deposit): RECORD NUMBER (M015012) HAS BEEN MERGED WITH THIS RECORD AND DELETED FROM THE OREGON FILE


References

Reference (Deposit): OREGON METAL MINES HANDBOOK, 1941 , ODGMI BULL. 14 - B, P. 110 .

Reference (Deposit): JOHNSON, F.R., 1975, GEOLOGY OF THE QUARTZBURG MINING DISTRICT, GRANT COUNTY, OREGON; OREGON STATE UNIV. MS. THESIS, P.81

Reference (Deposit): IN THE US: ENGINEERING & MINING JOURNAL, SEPT. 1959, VOL. 160, NO. 9, P. 172


Oregon Gold

Where to Find Gold in Oregon

"Where to Find Gold in Oregon" 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 Oregon. Read more: Where to Find Gold in Oregon.