| Deposit ID | 10014132 |
|---|---|
| MRDS ID | D010776 |
| Record type | Site |
| Current site name | Logan Mine |
| Alternate or previous names | Logan Group, Patented Claims: General Logan, MS 2476, General Sherman, MS 2477, General O. O. Howard, MS 2478, General Sheridan, MS 2479, Little Casper, MS 19665, Goliath, MS 19665 |
| Related records | 10214434 |
| Geographic coordinates: | -108.02426, 37.71723 (WGS84) |
|---|---|
| Elevation | 2935 |
| Relative position | 1.73 MILES N 10 E FROM RICO |
Political divisions (FIPS codes)
Dolores(county)
Colorado(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Rico(quadrangle 1:24,000 scale)
Dove Creek(quadrangle 1:100,000 scale)
Cortez(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Upper Dolores(hydrologic unit)
Upper Colorado-Dolores(hydrologic accounting unit)
Upper Colorado-Dolores(hydrologic subregion)
Upper Colorado(hydrologic region)
Federal lands
San Juan National Forest(National Forest)
National Forest FS(Type of land area)
FS(Federal land areas administered by FS)
| Country | State | County |
|---|---|---|
| United States | Colorado | Dolores |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| New Mexico | 040N | 011W | 24 | E2 | Colorado |
| Commodity | Importance |
|---|---|
| Silver | Primary |
| Lead | Primary |
| Zinc Critical | Primary |
| Gold | Primary |
| Sulfur-Pyrite | Tertiary |
| Manganese Critical | Tertiary |
| Materials | Type of material |
|---|---|
| Pyrite | Ore |
| Sphalerite | Ore |
| Fluorite | Gangue |
| Gypsum | Gangue |
| Halloysite | Gangue |
| Quartz | Gangue |
| Sericite | Gangue |
| Result | ANALYSIS OF HALLOYSITE: 38.65% SIO2, 33.27% AL2O3, 0.22% FE2O3, 28.14% COMBINED H2O. ANALYSIS OF LIMESTONE: 55.1% CAO, 43.39% CO2 (BY DIFFERENCE), 0.80% SIO2, TRACE TIO2, 0.04% AL2O3, 0.07% FE2O3, 0.10% FEO (AS CARBONATE), 0.13% MNO (AS CARBONATE), 0.03% CUO (AS CARBONATE), 0.09% ZNO (AS CARBONATE), 0.25% MGO (AS CARBONATE), TRACE P2O5, TRACE S (AS PYRITE). ANALYSIS OF SANDSTONE: 83.95% SIO2, 8.92% AL2O3 (WITH SOME TIO2), 0.48% FE2O3, 0.13% FEO, 0.04% AG, TRACES PB AND CU, 0.97% MGO, 0.12% CAO, 0.06% NA2O, 3.09% K2O, 1.90% COMBINED H2O. ANALYSIS OF ALTERED SANDSTONE: 62.88% SIO2, 21.38% AL2O3 (WITH SOME TIO2), 1.09% FE2O3, LITTLE MNO, NONE TO TRACE AG, 0.34% PB, 2.00% MGO, 0.40% CAO, 0.07% NA2O, 6.59% K2O, 5.49% COMBINED H2O, 0.53% SO3. |
|---|
| Model code | 72 |
|---|---|
| USGS model code | 19a |
| Deposit model name | Polymetallic replacement |
| Mark3 model number | 47 |
| Host or associated | Associated | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Latite | ||||||||
| Rock unit name | Hornblende Latite Porphyry | ||||||||
| Rock description | Hornblende Latite Porphyry | ||||||||
| |||||||||
| Host or associated | Host |
|---|---|
| Rock type | Sedimentary Rock > Clastic Sedimentary Rock > Sandstone |
| Host or associated | Host |
|---|---|
| Rock type | Sedimentary Rock > Carbonate > Limestone |
| Rock unit name | Hermosa Formation |
| Rock description | Hermosa Formation |
| (1) | -108.02426, 37.71723 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | San Juan Uplift, Paradox Basin |
| Type of structure | Local |
| Structure description | Rico Dome, Blackhawk Fault, Princeton Fault |
| Development status | Past Producer |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| Discovery year | 1885 |
| Discoverer | W. B. Norton And Others (Claimants) |
| Year of first production | 1885 |
| District name | Pioneer (Rico) District |
|---|
| Ownership category | National Forest |
|---|---|
| Area name | San Juan N. F. |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | D010776 | |
| U.S. Bureau of Mines | Minerals Availability System | MAS | 0080330126 |
MCKNIGHT, E.T., 1974, GEOLOGY AND ORE DEPOSITS OF THE RICO DISTRICT, COLORADO: USGS PROF. PAPER 723.
PRATT, W.P., AND OTHERS, 1969, GEOLOGIC MAP OF THE RICO QUADRANGLE, DOLORES AND MONTEZUMA COUNTIES, COLORADO: USGS MAP GQ-797.
RANSOME, F.L., 1901, THE ORE DEPOSITS OF THE RICO MOUNTAINS, COLORADO: USGS 22D ANN. REPT., PT. 2, P. 390-392
CROSS, WHITMAN, AND RANSOME, F.L., 1905, DESCRIPTION OF THE RICO QUADRANGLE: USGS FOLIO 130.
BLM MINERAL SURVEYS MS 2476, 2477, 2478, 2479, 19665
| Subject category | Comment text |
|---|---|
| Deposit | Discovery Year: 1880S |
| Deposit | GENERALLY SOUTH-DIPPING MIDDLE AND UPPER HERMOSA SANDSTONE, LIMESTONE, AND SHALE COVERED BY EXTENSIVE LANDSLIDES BUT BELOW ARE CUT BY NW-TRENDING BLACKHAWK FAULT, DOWNTHROWN ON NE. ONE CROSSCUT SHOWS FAULT TO BE 12-FT VEIN OF QUARTZ AND PYRITE MASSES IN BROKEN COUNTRY ROCK AND GOUGE. TWO OR MORE BLANKET REPLACEMENT ORES OCCUR BETWEEN SANDSTONE AND LIMESTONE. NEAR LOGAN NO. 2 SHAFT, BLANKET IS IRREGULARLY DIPPING, CELLULAR, CRUMBLING LIMONITE GRADING INDISTINCTLY INTO FE-STREAKED, SERICITIZED SANDSTONE. NEARER LOGAN SHAFT, 3- TO 4-FT-THICK BLANKET UNDERLIES ALTERED SANDSTONE AND CONTAINS FRAGMENTS FROM IT, IS ROUGHLY LAMINATED OCHEROUS OR LIMONITIC MASS OVERLYING IRREGULAR LIMESTONE SURFACE AND SEPARATED FROM IT BY THIN, MINUTELY FISSURED, MANGANIFEROUS LAYER OF GPYSUM AND HALLOYSITE. THIS MAIN BLANKET COULD BE SAME AS THAT WORKED IN CHC AND WELLINGTON MINES. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-SEP-1983 | Schwochow, Stephen D. | Colorado Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
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