Mine detail: Little Johnnie Mine

Previously called 'Unpatented Claims: Little Johnnie Nos. 1-2Cathey Nos. 1-5Charley Nos. 1-5Little Johnnie Extension'

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Location

Lat / long:

38.32167, -107.08674

Resource(M)

Primary:	Thorium
Tertiary:	REE
Ore:	Thorite
Gangue:	Allophane, Apatite, Barite, Chlorite, Clinozoisite, Goethite, Hematite, Quartz, Rutile, Tourmaline, Xenotime
Orebody form:	TABULAR
Discovery year:	1949

Production

Operation type:	Unknown
Deposit type:	Vein
Production size:	None
Development status:	Occurrence

Geology

Host rock:	Dubois Greenstone--Felsite And Felsite Porphyry;Dubois Greenstone--Hornblende Schist And Amphibolite
Host type:	Quartzite,Schist,Amphibolite
Associated rock:	Thorium Vein;Syenite;Gabbro;Diabase Dikes
Associated type:	Syenite,Diabase,Gabbro
Structure:	Gunnison Uplift, San Juan Volcanic Field, Gunnison Gold Belt, Iron Hill Alkalic Complex, Tolvar Peak Stock
Tectonic:	Central Cordillera (Southern Rocky Mtns)

References

MRDS	D011172
DEP	10014417
Reference	{Deposit:: HEDLUND, D.C., AND OLSON, J.C., 1975, GEOLOGIC MAP OF THE POWDERHORN QUADRANGLE, GUNNISON AND SAGUACHE COUNTIES, COLORADO: USGS MAP GQ-1178.}{Deposit:: HEDLUND, D.C., AND OLSON, J.C., 1961, FOUR ENVIRONMENTS OF THORIUM-, NIOBIUM-, AND RARE-EARTH-BEARING MINERALS IN THE POWDERHORN DISTRICT OF SOUTHWESTERN COLORADO: USGS PROF. PAPER 424-B, P. B283-B286.}{Deposit:: OLSON, J.C., AND HEDLUND, D.C., 1981, ALKALIC ROCKS AND RESOURCES OF THORIUM AND ASSOCIATED ELEMENTS IN THE POWDERHORN DISTRICT, GUNNISON COUNTY, COLORADO: USGS PROF. PAPER 1049-C.}{Deposit:: OLSON, J.C., AND WALLACE, S.R., 1956, THORIUM AND RARE-EARTH MINERALS IN POWDERHORN DISTRICT, GUNNISON COUNTY, COLORADO: USGS BULL. 1027-0.}{Deposit:: NELSON-MOORE, J.L., AND OTHERS, 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: CGS BULL. 40, P. 175.}{Deposit:: ADAMS, J.W., AND MOORE, F.B., 1951, AEC PRELIM. RECON. REPT. RR-95.}{Deposit:: COLORADO DIV. MINES INF. REPTS.}
Reporter	Schwochow, Stephen D.