The Rainbow Extension 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.
Lat, Long: 39.46222, -120.83694
Map: View on Google Maps
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.
Rainbow Extension MRDS details
Primary: Rainbow Extension
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Deposit Size: S
General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Sierra Nevada
Mineral Deposit Model
Comment (Geology): CONTACT WHICH DIPS STEEPLY E & IS FOUND IN SCHIST A FEW FT E. THE SAME N FAULT THAT CUTS THE VEIN IN MIDDLE ADIT, HERE DISPLACES VEIN BUT NOT SERP CONTACT. W VEIN REGULAR, WITHOUT BENDS & SPLITS. W SCHIST WALLROCKS, THO SERP MAY LIE OVERHEAD.
Comment (Location): UTM EST. NE 1/4
Comment (Commodity): HIGH-GRADE ORE OBTAINED N OF SPLIT IN E VEIN. POSITION OF SML HIGH GRADE SHOOT IN E VEIN APPEARS DEPENDENT ON JUNCTION AND MAY EXTEND TO GREATER DEPTH.
Comment (Production): NO PRODUCTION ON W VEIN. IDLE FOR SOME YEARS BEFORE 1934 . NO OTHER PRODUCTION RECORD FOUND.
Comment (Deposit): VEINS
Comment (Workings): 4 ADITS TOTAL 800 FT. 5TH, SPIRITUALIST ADIT, OF UNKNOWN LENGTH.
Comment (Geology): 2 VEINS, S EXTENSION OF 16 - TO - 1 LYING IN AMPHIBOLITE SCHIST & W BLACK SLATY CONGLOMERATE 250 FT W OF W VEIN. SML SERPENTINE MASS ALONG FOOTWALL OF S PART OF E VEIN IN UPPER ADIT & SURFACE. W VEIN, KNOWN AS TWENTY-ONE VEIN, MAY HAVE ALTERED EDGE OF SERP MASS TO GOSSAN SAME AS ON NW EXT OF CLINTON VEIN OF RAINBOW MINE; IT SHOWS CONTINUOUS QTZ TO SPIRITUALIST ADIT WHERE IT FADES TO SML POORLY DEFINED SLIP. MAIN ADIT RECOVERS THIS VEIN 250 FT W, WHERE IT IS CUT BY STEEP W DIPPING FAULT; VEIN STRIKES AVE. N 30 W, DIPS 50 - 75 NW. FAULT MAY BE CONTINUATION OF CLINTON VEIN, W FLATTER DIP & MAY ALSO BE SAME FAULT DISPLACING E VEIN. LOWER ADITS E VEIN LESS REGULAR THAN W. VEIN. S. OF E. VEIN SPLIT, THE BRANCHES GROW LESS DEFINITE. E BRANCH FOLLOWED FOR 300 FT IN MIDDLE ADIT, WHERE IT FADES INTO SML STRINGERS IN INDEFINITE HANGING WALL WHICH HERE STRIKES E OF N. UPPER ADIT PROSPECTS PROBABLE E BRANCH. NEAR PORTAL SERPENTINE FORMS FOOTWALL. TO THE S THE VEIN DIPS 40 NE, LEAVES SERPENTINE
Reference (Deposit): AVERILL, C. V., 1942 , MINES AND MINERAL RESOURCES OF SIERRA CO.: CDM CALIF. JOUR. MINES AND GEOL., VOL. 38 , NO. 1 , P. 63 .
Reference (Deposit): FERGUSON, H. G., & GANNETT, R. W., 1932 , GOLD QTZ VEINS OF THE ALLEGHANY DISTRICT, CALIF.; USGS PROF. PAPER 172 , P. 105 , P. 106 .
Reference (Production): FERGUSON, 1932
"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 at Where to Find Gold in California.