Irelan

The Irelan is a gold mine located in Sierra 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

Name: Irelan

State:  California

County:  Sierra

Elevation:

Commodity: Gold

Lat, Long: 39.44028, -120.82333

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 Irelan

Irelan MRDS details

Site Name

Primary: Irelan


Commodity

Primary: Gold


Location

State: California
County: Sierra


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

Alteration Type: L
Alteration Text: Carbonate


Rocks

Name: Gabbro
Role: Host
Age Type: Host Rock
Age Young: Late Permian


Analytical Data

Not available


Materials

Ore: Gold
Gangue: Quartz


Comments

Comment (Production): WORKED INTERMITTENTLY.

Comment (Deposit): VEINS, POCKETS, SHOOTS

Comment (Workings): ADITS, 1500 FT APART, WINZES, DRIFTS. SHALLOW SURFACE WORKINGS.

Comment (Commodity): BEST ORE NEAR SURFACE. HIGH GRADE POCKETS SAID TO BE WHERE QTZ IS THICKEST. POSSIBLE CORRELATION OF HIGH-GRADE BUNCHES W STRINGERS BRANCHING FROM WALL ON HANGING WALL SIDE.

Comment (Geology): 2 VEINS IN TUFFS, SLATES INTRUDED BY SCHISTOSE GABBRO INTENSE SHEARING & ALTERATION CLOSE TO VEIN. TUFFS & SLATE ARE HANGING WALL OF E VEIN, FOOTWALL OF W VEIN, SUGGESTING REVERSE MOVEMENT ON BOTH VEINS. 2 OTHER SMALLER VEINS IN UPPER WORKINGS. VEIN CHANGES STRIKE SHARPLY FROM N 60 W TO N 30 W FOR 500 - 1000 FT, THEN REVERSE TO ORIGINAL DIRECTION. DIP VARIES 30 - 70 NE, FLATTER AT SURFACE. QTZ LACKING IN PLACES. POST MINERAL MOVEMENT, LITTLE GOUGE, BUT SOME QTZ CEMENTED QTZ BRECCIA INDICATES MOVEMENT PRIOR TO VEIN FILLING. SMALL POSTMINERAL TRANSVERSE FAULT. ARSENOPYRITE WAS CRUSHED BEFORE AU WAS INTRODUCED.


References

Reference (Deposit): AVERILL, C. V., 1942 , MINES AND MINERAL RESOURCES OF SIERRA CO.: CDM CALIF. JOUR. MINES AND GEOL., VOL. 38 , NO. 1 , P. 58 .

Reference (Deposit): FERGUSON, H. G., & GANNETT, R. W., 1932 , GOLD QTZ VEINS OF THE ALLEGHANY DISTRICT, CALIF.; USGS PROF. PAPER 172 , P. 127 , 128 .

Reference (Deposit): LOGAN, C. A., 1929 , SIERRA CO.: CDMM 25TH REPORT STATE MINERALOGIST, APRIL, P. 179 .

Reference (Production): FERGUSON & GANNETT, 1932


California Gold

Where to Find Gold in California

"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.