Golconda Group Mine

The Golconda Group Mine is a gold, silver, and lead mine located in Owyhee county, Idaho at an elevation of 6,975 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: Golconda Group Mine

Commodity

Primary: Gold
Primary: Silver
Primary: Lead
Secondary: Copper
Secondary: Zinc

Location

State: Idaho
County: Owyhee
District: South Mountain District

Land Status

Land ownership: Private
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.

Holdings

Not available

Workings

Type: Surface/Underground

Ownership

Owner Name: Golconda Group Min. Co. ( 1955 )

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Discovery Year: 1868
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Intermontane Plateaus
Physiographic Province: Columbia Plateau
Physiographic Section: Payette Section
Physiographic Detail: Owyhee Mountains

Mineral Deposit Model

Not available

Orebody

Form: IRREGULAR

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Oxidized; Gossan

Rocks

Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous

Analytical Data

Analytical Data: DUMP SAMPLE ASSAYED $6.20 AU, 11 3/4 OZ AG, 9 1/2% ZN, 1% CU. OXIDIZED CROSSCUT SAMPLE ASSAYED $11 AU, 26.4 OZ AG, 1.7% PB, 4.25% CU, 6.7 % ZN

Materials

Ore: Chalcopyrite
Ore: Calamine
Ore: Galena
Ore: Linarite
Ore: Smithsonite
Ore: Malachite
Ore: Sphalerite
Gangue: Limonite
Gangue: Actinolite
Gangue: Calcite

Comments

Comment (Commodity): OXIDIZED CROSSCUT SAMPLE ASSAYED $11 AU, 26.4 OZ. AG, 1.7% PB, 4.25% CU, 6.7% ZN

Comment (Development): 13 PATENTED CLAIMS IN 1955 (BLM LAND IN 1971 ?)

Comment (Deposit): ANOTHER VEIN STRIKES N 24 DEG E

Comment (Geology): THE LIMESTONE AND SCHIST AGES ARE UNKNOWN, PRE CRET.

Comment (Deposit): THE ORE IS ALWAYS FOUND IN THE SCHIST AND CRYSTALLINE LIMESTONE. THE DIORITE WHICH BOARDERS THE SCHIST AND LIMESTONE HAS CLEARLY ALTERED THEM THROUGH CONTACT METAMORPHISM.

Comment (Location): AT THE HEAD OF WILLIAMS CREEK

References

Reference (Deposit): SORENSON, R. E., 1927 , THE GEOLOGY AND ORE DEPOSITS OF THE SOUTH MOUNTAIN MINING DISTRICT, OWYHEE COUNTY, IDAHO: IDAHO BUREAU OF MINES AND GEOLOGY PAMPHLET 22 , 47 P.

Reference (Deposit): LINDGREN W., 1898, THE GOLD AND SILVER VEINS OF SILVER CITY, DELAMAR, AND OTHER MINING DISTRICTS IN IDAHO: 20TH ANN. REPORT, U.S.G.S., P. 75-205 (PART 3).

Reference (Deposit): BELL, R. N., 1907 , SOUTH MOUNTAIN, IDAHO: ENG. MINING JOUR., V. 83 , NO. 6 , P. 283 - 284.

Reference (Deposit): SHANNON, E. U., 1918, ON THE OCCURENCE OF ILVAITE IN THE SOUTH MOUNTAIN MINING DISTRICT, AMER. JOUR. OF SCI., 4TH SER., VOL. 45 NO. 266 P. 118 - 125

Reference (Deposit): 5) MC DOWELL, G. A., 1955 , 57TH ANN. REPT. OF THE MINING INDUSTRY OF IDAHO FOR 1955.

Reference (Deposit): 1898 COMPILE W. LINDGREN 20TH ANN. REPORT

Reference (Deposit): 1927 GEOLMAP IDAHO BUREAU OF MINES & GEOL. PAMPHLET 22

Reference (Deposit): 1934 DIREXPL EXPLOR. CO. OF CALIFORNIA

Reference (Deposit): 1946 DIREXPL SOUTH MOUNTAIN MIN. AND MLG. CO.

Reference (Production): BELL, R. N., 1912 , 13TH ANN. REPT. OF THE MINING INDUSTRY OF IDAHO FOR 1912. LINDGREN, W., 1898 , USGS 20TH ANN. REPT., PT. 3 , P. 75 - 205.

Idaho Gold

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