| Deposit ID | 10048444 |
|---|---|
| MRDS ID | MP00031 |
| MAS/MILS ID | 0530331236 |
| Record type | Site |
| Current site name | Three Brothers Zone |
| Geographic coordinates: | -121.3456, 47.51792 (WGS84) |
|---|---|
| Elevation | 1402 |
| Location accuracy | 1000(meters) |
| Relative position | ABOUT 1.6 MI EAST OF BIG SNOW MOUNTAIN, Estimated From Map In Gualtieri And Others, Estimated From Map In Gualtieri And Others, Estimated From Map In Gualtieri And Others |
Political divisions (FIPS codes)
King(county)
Washington(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Big Snow Mountain(quadrangle 1:24,000 scale)
Skykomish River(quadrangle 1:100,000 scale)
Wenatchee(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Snoqualmie(hydrologic unit)
Puget Sound(hydrologic accounting unit)
Puget Sound(hydrologic subregion)
Pacific Northwest(hydrologic region)
Federal lands
Mt. Baker-Snoqualmie National Forest(National Forest)
National Forest FS(Type of land area)
FS(Federal land areas administered by FS)
| Country | State | County |
|---|---|---|
| United States | Washington | King |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| Willamette | 024N | 012E | 34 | NEAR N BORDER | Washington |
| Commodity | Importance |
|---|---|
| Copper | Primary |
| Molybdenum | Primary |
| Gold | Tertiary |
| Silver | Tertiary |
| Lead | Tertiary |
| Arsenic Critical | Tertiary |
| Materials | Type of material |
|---|---|
| Chalcopyrite | Ore |
| Galena | Ore |
| Hematite | Ore |
| Magnetite | Ore |
| Molybdenite | Ore |
| Pyrite | Ore |
| Pyrrhotite | Ore |
| Chlorite | Gangue |
| Quartz | Gangue |
| Siderite | Gangue |
| Result | SEE DERKEY AND OTHERS (1990) FOR ANALYTICAL DATA FOR CLIPPER |
|---|
| Model code | 53 |
|---|---|
| USGS model code | 17 |
| Deposit model name | Porphyry Cu |
| Mark3 model number | 4 |
| Host or associated | Host |
|---|---|
| Rock type | Plutonic Rock > Granitoid > Tonalite |
| Rock unit name | Snoqualmie Batholith, Northern Phase;Snoqualmie Batholith, Northern Phase |
| Rock description | Snoqualmie Batholith, Northern Phase;Snoqualmie Batholith, Northern Phase |
| (1) | -121.3456, 47.51792 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | Part Of Ne-Trending En-Echelon Belt Of Nw-Striking Faults, Fractures, And Breccia Pipes |
| Type of structure | Local |
| Structure description | Brecciation Of Host Rocks |
| General form | DISSEMINATED, STOCKWORK |
|---|
| Development status | Occurrence |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| District name | Snoqualmie District |
|---|
| Ownership category | National Forest |
|---|---|
| Area name | In Snoqualmie National Forest Near Alpine Lakes Wilderness |
| Type | Owner |
|---|---|
| Owner | United Cascade Mining Co., Inc. |
| First year | 1990 |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | MP00031 | |
| U.S. Bureau of Mines | Minerals Availability System | MAS | 0530331236 |
HOLLISTER, V.F., 1979, PROPHYRY COPPER-TYPE DEPOSITS OF THE CASCADE VOLCANIC ARC, WASHINGTON: MINERALS SCIENCE AND ENGINEERING, V. 11, P. 32.
DERKEY, R.E., JOSEPH, N.L., AND LASMANIS, RAYMOND, 1990, METAL MINES OF WASHINGTON - PRELIMINARY REPORT: WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES OPEN-FILE REPORT 90-18, P. 109-110.
GUALTIERI, J.L., THURBER, H.K., MILLER, M.S., MCMAHAN, A.B., AND FEDERSPIEL, F.F., 1975, MINERAL RESOURCES OF ADDITIONS TO THE ALPINE LAKES STUDY AREA, CHELAN, KING, AND KITTITAS COUNTIES, WASHINGTON: U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 75-3, P. 51-61.
U.S. GEOLOGICAL SURVEY BULLETIN 1542-E, 1989, FIG. 11, P. 98; P. 101-102.
| Subject category | Comment text |
|---|---|
| Deposit | CONSIDERED PART OF CLIPPER BY DERKEY AND OTHERS (1990) |
| General | Look at data in the Middle Fork Property file for more information. The Three Brothers is near the northern end of a string of mineralized, fractured zones, probably between the Hawk and Red Face zones. |
| Deposit | DEPOSIT LIES BETWEEN TWO STEEPLY DIPPING FAULTS |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-MAY-91 | Peterson, Jocelyn A. | U.S. Geological Survey | |
| Reporter | 16-FEB-94 | Thurber | U.S. Bureau of Mines | |
| Updater | 18-MAY-09 | Causey, J. Douglas | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.