Union

The Union is a gold mine located in El Dorado county, California.

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: Union
Secondary: Springfield

Commodity

Primary: Gold

Location

State: California
County: El Dorado

Land Status

Not available

Holdings

Not available

Workings

Type: Surface/Underground

Ownership

Not available

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: Sierra Nevada

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Name: Slate
Role: Host
Age Type: Host Rock
Age Young: Late Jurassic

Analytical Data

Not available

Materials

Ore: Gold
Gangue: Quartz

Comments

Comment (Other Database): RECORD NUMBER 354 IS A POTENTIAL DUPLICATE OF THIS RECORD

Comment (Location): UTM ACC. CTR W 1/2

Comment (Workings): 2000 FT. SPRINGFIELD SHAFT CUTS POUNDSTONE VEIN AT 1200 FT., MCCOSMIC ABOUT 1540 FT. 2ND SHAFT, CLEMENT, FT. DEEP IS 750 FT. N. 200 FT. BEYOND IS 500 FT. KLONDIKE SHAFT. SEVERAL XCUT ADITS DRIVEN TO W. ONE 700 FT. LONG NEAR SPRINGFIELD SHAFT, AND ONE NEAR KLONDIKE SHAFT, ABOUT 600 FT. OVER 21000 FT. OF DRIFTS.

Comment (Geology): 5 - 10 FT. THICK MAIN VEINS, POUNDSTONE, KLONDIKE AND MCCOSMIC VEIN, THE LATTER 200 FT. W OF OTHER MAIN VEINS. A SERIES OF LESSER VEINS TO W OF MAIN VEINS. VEINS DIP 60 - 79 E. SPRINGFIELD SHAFT IS 320 FT. E OF POUNDSTONE VEIN AT SURFACE, CUTTING IT AT 1200 FT. VERT. DEPTH.

Comment (Production): ESTIMATED VALUE OF TOTAL OUTPUT IS FROM $2700000 TO $5000000. IN EARLY 1850S RICH SURFACE OUTCROPS WERE WORKED, PRIOR TO 1868 THE UNION & CHURCH CLAIMS WERE WORKED TOGETHER, AFTERWARDS SEPERATLY. INTERMITTENT OPERATION IN 1930S. MCCOSMIC VEIN ORE YIELDED UP TO $25/TON: ORE FROM POUNDSTONE VEIN YIELDED $8/TON, AND HAD THE GREATEST PRODUCTION. AN ORE SHOOT SAID TO HAVE YIELDED $450,000 FROM 15000 TONS ORE PRIOR TO 1868 W SHALLOW WORKINGS PRODUCING $150000 MORE.

Comment (Deposit): VEINS, ORE SHOOT

References

Reference (Deposit): CLARK, W. B., AND CARLSON, D. W., 1956 , MINES AND MINERAL RESOURCES OF EL DORADO CO., CALIF.: CALIF. JOUR. OF MINES AND GEOL., VOL. 52 , NO. 4 , PG. 427 , 428 , 536 .

Reference (Deposit): LOGAN, C. A., 1938 , MIN. RESOURCES OF EL DORADO CO.: CALIF. JOUR. MINES AND GEOL., VOL. 34 , NO. 3 , PL. 2 .

Reference (Deposit): LOGAN, C. A., 1935 , MOTHER LODE GOLD BELT OF CALIF.: CALIF. DIV. MINES BULL. 108 , PG. 42 , 43 .

Reference (Production): CLARK AND CARLSON, 1956 , LOGAN, 1935 .

California Gold

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