Dix and Cimarron Chief Groups

Site Name

Primary: Dix and Cimarron Chief Groups

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Commodity

Primary: Molybdenum
Primary: Silver
Primary: Gold
Secondary: Lead
Tertiary: Bismuth

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Location

State: Colorado
County: Hinsdale
District: Matterhorn Peak Area

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Land Status

Land ownership: National Forest
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.

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Holdings

Not available

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Workings

Not available

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Ownership

Not available

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Production

Not available

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Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S

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Physiography

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

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Mineral Deposit Model

Not available

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Orebody

Not available

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Structure

Type: R
Description: San Juan Volcanic Field, San Juan Depression

Type: L
Description: San Juan-Uncompahgre Calderas, Matterhorn Peak Stock

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Alterations

Not available

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Rocks

Name: Monzonite
Role: Associated
Age Type: Associated Rock
Age Young: Miocene

Name: Monzonite
Role: Associated
Age Type: Host Rock Unit
Age Young: Oligocene

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Analytical Data

Analytical Data: CHIP SAMPLE FROM TRENCH WALL OF LOCATED PROSPECT: GT 5% AL, 0.06% CA, 1.0% FE, 0.05% MG, 0.006% MN, 0.2% TI, 100 PPM CR, 40 PPM CU, 60 PPM MO, 500 PPM PB, 100 PPM ZR.
Analytical Data: TWO CHIP SAMPLES FROM PROSPECT PIT AT HEAD OF UNNAMED TRIBUTARY OF MIDDLE FORK CIMARRON RIVER 1.2 MILE NNW OF LOCATED PROSPECT: 1 AND 4% AL, 0.03% CA, 4 AND 1% FE, LT 0.004% MG, 0.03 AND 0.01% MN, 0.2 AND 0.1% TI, 0 AND 100 PPM B, 4000 AND 0 PPM BA, 0.04% AND 100 PPM BI, 500 AND 100 PPM CR, 80 AND 40 PPM CU, LT 20 PPM AND 0 MO, 700 PPM PB, 1000 AND LT 1000 PPM SR, 70 PPM ZR, 0.04 AND 0.02 OZ/TON AU, 9.6 AND 1.2 OZ/TON AG (FIRE ASSAYS)
Analytical Data: CHIP SAMPLE FROM PIT WALL AT PROSPECT ON UNNAMED NW TRIBUTARY OF EAST FORK 0.7 MILE NNE OF LOCATED PROSPECT: GT 5% AL, 0.03% CA, 3% FE, 0.2% MG, 0.03% MN, 0.4% TI, 100 PPM CR, 40 PPM CU, LT 20 PPM MO, 700 PPM PB, 1000 PPM SR, 300 PPM ZR, TRACE AU, 0.1 OZ/TON AG.
Analytical Data: CHIP SAMPLE FROM VEIN IN SHAFT ALONG PACK TRAIL ON NORTH SIDE OF EAST FORK 0.75 MILE NE OF LOCATED PROSPECT: GT 5% AL, 0.1% CA, 4% FE, 0.8% MG, 0.05% MN, 0.4% TI, 100 PPM CR, 60 PPM CU, LT 20 PPM MO, 100 PPM PB, 100 PPM ZR, 0.1 OZ/TON AG.
Analytical Data: CHIP, GRAB, AND SPECIMEN SAMPLES FROM THREE TRENCHES ALONG EAST FORK CIMARRON RIVER ABOUT 2000 FT NNW OF LOCATED PROSPECT: GT 5% AL, 0.06 TO 0.1% CA, 4 TO 5% FE, 0.8 TO 2% MG, 0.03 TO 0.05% MN, 0.2 TO 0.4% TI, LT 100 PPM B, 100 PPM CR, 40 TO 100 PPM CU, LT 20 PPM MO, 100 TO 400 PPM PB, LT 1000 PPM SR, 100 TO 200 PPM ZR, TRACE AU, 0.1 OZ/TON AG.
Analytical Data: STEVEN AND OTHERS' (1977) SEMIQUANTITATIVE SPECTROGRAPHIC ANALYSES.

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Materials

Not available

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Comments

Comment (Deposit): DEPOSIT LIES IN WIDESPREAD PRECALDERA SEQUENCE OF INTERBEDDED, HYDROTHERMALLY ALTERED, INTERMEDIATE-COMPOSITION FLOWS AND BRECCIAS INTRUDED BY SMALL, COMPOSITE MONZONITE STOCK (NORTH SLOPE OF MATTERHORN PEAK) FROM WHICH ANDESITE/RHYODACITE PORPHYRY DIKES RADIATE TO NW, NORTH, AND NE. GEOCHEMICAL ANOMALIES FOUND INDICATE VEIN AND POSSIBLE DISSEMINATED MINERALIZATION. HIGHER GRADE MINERALIZATION COULD EXIST AT DEPTH. ALTHOUGH LOCATED OUTSIDE UNCOMPAHGRE CALDERA, STOCK COULD POSTDATE UNCOMPAHGRE COLLAPSE AND PREDATE LAKE CITY COLLAPSE. AGE DATE INDICATES CLOSER ASSOCIATION WITH LAKE CITY CYCLE.

Comment (Workings): SEVERAL TRENCHES AND SURFACE PROSPECT PITS; ONE SHALLOW SHAFT, DEPTH UNKNOWN.

Comment (Commodity): COMMODITIES LISTED ABOVE OCCUR AS GEOCHEMICAL ANOMALIES

Comment (Location): ALTHOUGH TOTAL EXTENT OF DIX (190 UNPATENTED CLAIMS) AND CIMARRON CHIEF (50 UNPATENTED CLAIMS) GROUPS IS UNCERTAIN, THEY APPARENTLY COVER GENERAL AREA OF MATTERHORN PEAK, EXTENDING ABOUT TWO MILES TO NORTH, TO UNCOMPAHGRE PEAK ON EAST, TO COXCOMB PEAK ON WEST, AND TO UPPER MATTERHORN CREEK ON SOUTH. CLAIMS EXTEND EAST ONTO UNCOMPAHGRE PEAK (1963) QUAD. ELEV AND LAT-LONG GIVEN ARE FOR PROSPECT TRENCH NEAR HEAD OF EAST FORK CIMARRON RIVER ON NORTH SIDE OF SADDLE BETWEEN WETTERHORN AND MATTERHORN PEAKS, FROM WHICH ANOAMLOUS MO WAS REPORTED IN GEOCHEMICAL SAMPLE, IN NE SEC. 15 (UNSURVEYED). LAND STATUS VALUE CALCULATED 7-94 USING GIS OVERLAY ANALYSIS WITH USFS LAND OWNERSHIP BOUNDARIES, 1:126,720 SCALE. ; INFO FROM LAND.ST :1975

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References

Reference (Deposit): STEVEN, T.A., AND OTHERS, 1977, MINERAL RESOURCES OF STUDY AREAS CONTIGUOUS TO THE UNCOMPAHGRE PRIMITIVE AREA, SAN JUAN MOUNTAINS, SOUTHWESTERN COLORADO: USGS BULL. 1391-E, P. 85, 112-113, PLS. 1, 3.

Reference (Deposit): LIPMAN, P.W., 1976, GEOLOGIC MAP OF THE LAKE CITY CALDERA AREA, WESTERN SAN JUAN MOUNTAINS, SOUTHWESTERN COLORADO: USGS MAP I-962.

Reference (Deposit): LUEDKE, R.G., 1972, GEOLOGIC MAP OF THE WETTERHORN PEAK QUADRANGLE, COLORADO: USGS MAP GQ-1011.

Reference (Deposit): FISCHER, R.P., AND OTHERS, 1968, MINERAL RESOURCES OF THE UNCOMPAHGRE PRIMITIVE AREA, COLORADO: USGS BULL. 1261-C.

Reference (Deposit): LIPMAN, P.W., AND OTHERS, 1976, MULTIPLE AGES OF MID-TERTIARY MINERALIZATION AND ALTERATION IN THE WESTERN SAN JUAN MOUNTAINS, COLORADO: ECON. GEOLOGY, V. 71, NO. 3, P. 571-588.

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