Unnamed Rutile Occurrence

The Unnamed Rutile Occurrence is a mine located in Jefferson county, Colorado at an elevation of 8,120 feet.

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

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Site Name

Primary: Unnamed Rutile Occurrence

Commodity

Tertiary: Titanium, Metal
Tertiary: Zinc

Location

State: Colorado
County: Jefferson
District: Clear Creek Pegmatite Province

Land Status

Land ownership: Private
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Deposit Type: Metamorphic
Operation Type: Unknown
Discovery Year: 1968
Discovery Method: Other
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains

Mineral Deposit Model

Not available

Orebody

Form: LENTICULAR

Structure

Type: R
Description: Front Range Uplift

Type: L
Description: Kennedy Gulch Fault Zone, Floyd Hill Fault Zone

Alterations

Not available

Rocks

Name: Pegmatite
Role: Associated
Age Type: Host Rock
Age Young: Neoproterozoic

Name: Pegmatite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Neoproterozoic

Name: Pegmatite
Role: Associated
Age Type: Associated Rock
Age Young: Neoproterozoic

Analytical Data

Analytical Data: 3 11- TO 100-FT-THICK-INTERVAL COMPOSITE CHIP SAMPLES CONTAINED 2.2 TO 4.2% RUTILE AND 23 TO 67% TOPAZ. SEMIQUANTITATIVE SPECTROGRAPHIC ANALYSES OF RUTILE CONCENTRATES GAVE 0.3 TO 0.7% FE AND 500 TO 1500 PPM NB.
Analytical Data: MODAL ANALYSES (IN VOLUME %) OF 7 SAMPLES OF TOPAZ-QUARTZ GNEISS AND SILLIMANITIC TOPAZ-QUARTZ GNEISS GAVE 1.7 TO 3.1% RUTILE, 1 TO 44.8% SILLIMANITE, 0.4 TO 0.6% (LOW) AND 30.1 TO 71.9% (HIGH) TOPAZ, 5.5 TO 84.4% QUARTZ, 0.2 TO 13.0% APATITE, TRACE TO 0.3% ZIRCON. MINERALOGICAL COMPOSITION (IN WEIGHT %) BASED ON MINERAL SEPARATES FROM RUTILE-BEARING TOPAZ-QUARTZ GNEISS: 3 GRAB SAMPLES CONTAINED 0.6 TO 1.4% RUTILE AND 22 TO 51% TOPAZ

Materials

Ore: Gahnite
Ore: Rutile
Gangue: Topaz
Gangue: Sillimanite
Gangue: Zircon
Gangue: Apatite

Comments

Comment (Deposit): SILLIMANITIC TOPAZ-QUARTZ GNEISS IS ONE OF SEVERAL RUTILE-BEARING GNEISSES OCCURRING IN HORNBLENDE GNEISS SEQUENCE TRENDING WNW WITH NEAR-VERTICAL DIPS. PRINCIPAL RUTILE UNIT IS 11- TO 100-FT-THICK LENTICULAR BODY RECOGNIZED OVER STRIKE LENGTH OF 7000 FT. OTHER RUTILE GNEISSES TRACED SEVERAL MILES TO NW. RUTILE GRAINS ARE MOLDED AROUND TOPAZ AND INTERGROWN WITH PRISMATIC SILLIMANITE AND CONTAIN ACCESSORY APATITE AND ZIRCON BUT LACK MAGNETITE, ILMENITE, GARNET, AND SPHENE, WHICH OCCUR IN ADJACENT ROCKS. CHEMICALLY RESISTANT MINERALOGY, HIGH FLUORINE CONTENT, AND DEPLETION OF SEVERAL COMMON ELEMENTS (FE, ALKALI METALS, AND ALKALINE EARTHS) SUGGEST ORIGIN BY FLUORINE METASOMATISM, IN WHICH FLUORINE, AL, AND TI WERE ADDED OR ENRICHED.

Comment (Location): ACROSS SODA CREEK AND SNYDER GULCH. ELEV AND LAT-LONG GIVEN ARE FOR SAMPLE SITE APPROX MIDWAY ON DEPOSIT. ; INFO FROM LAND.ST :(1975)

Comment (Development): RUTILE DISCOVERED BY MICROSCOPIC EXAMINATION OF THIN SECTIONS

Comment (Workings): EXPLORATORY TRENCHES

References

Reference (Deposit): SHERIDAN, D.M., AND OTHERS, 1968, RUTILE AND TOPAZ IN PRECAMBRIAN GNEISS, JEFFERSON AND CLEAR CREEK COUNTIES, COLORADO: USGS CIRC. 567.

Reference (Deposit): SHERIDAN, D.M., AND MARSH, S.P., 1976, GEOLOGIC MAP OF THE SQUAW PASS QUADRANGLE, CLEAR CREEK, JEFFERSON, AND GILPIN COUNTIES, COLORADO: USGS MAP GQ-1337.

Colorado Mining Photos

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