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
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.
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" 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.
