| Deposit ID | 10078284 |
|---|---|
| MRDS ID | W026542 |
| Record type | Site |
| Current site name | Porphyry Dike Mine |
| Related records | 10124757 |
| Geographic coordinates: | -112.28839, 46.42768 (WGS84) |
|---|---|
| Elevation | 2280 |
| Relative position | 1.5 KM NE OF PAUPER MTN. |
Political divisions (FIPS codes)
Lewis and Clark(county)
Montana(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Three Brothers(quadrangle 1:24,000 scale)
Butte North(quadrangle 1:100,000 scale)
Butte(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Upper Missouri(hydrologic unit)
Upper Missouri(hydrologic accounting unit)
Missouri-Marias(hydrologic subregion)
Missouri(hydrologic region)
Federal lands
Helena-Lewis and Clark National Forest(National Forest)
National Forest FS(Type of land area)
FS(Federal land areas administered by FS)
| Country | State | County |
|---|---|---|
| United States | Montana | Lewis and Clark |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| Montana Principal | 008N | 006W | 24 | NE OF SE | Montana |
| Commodity | Importance |
|---|---|
| Gold | Primary |
| Arsenic Critical | Tertiary |
| Materials | Type of material |
|---|---|
| Gold | Ore |
| Limonite | Gangue |
| Pyrite | Gangue |
| Host or associated | Host | ||||
|---|---|---|---|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite | ||||
| |||||
| (1) | Granitic rock |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | Large Scale Volcanic And Igneous Intrusive Activities Boulder Batholith |
| Type of structure | Local |
| Structure description | Jointing, Overlapping Of Pyroclastics And Flow Units Thin Dikes And Faults |
| General form | IRREGULAR |
|---|
| Development status | Past Producer |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| Discovery year | 1890 |
| Year of first production | 1892 |
| District name | Rimini District |
|---|
| Ownership category | National Forest |
|---|
| Type of workings | Surface/Underground |
|---|---|
| Area | 0.405HA |
| Length | 731.52M |
| Overall depth | 38.1M |
| Overall length | 91.44M |
| Overall width | 45.72M |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | W026542 |
USGS BULL 842, P. 259-60.
USGS BULL 1151, P. 114-16, PL. 1.
USGS BULL 527, P. 84-85.
RUPPEL, E. T., 1963 , GEOL. OF THE BASIN QUAD., JEFF., LEWIS & CLARK, POWELL CO., MONT USGS BULL NO 1151
| Subject category | Comment text |
|---|---|
| Deposit | 4 INTERLAYERED AND OVERLAPPING PYROCLASTIC AND FLOW UNITS IN THE RHYOLITE. THESE UNITS ARE CUT BY THIN DIKES AND BY FAULTS. PRIMARY GOLD WAS DISSEMINATED IN THE CLOSELY HOINTED, LAMINATED FLOW ROCKS. PART OF FREE GOLD HAS BEEN WASHED INTO OPEN JOINTS AND DESCENDED THROUGH THE RHYOLITE AND CONCENTRATED. RICHEST ORE WAS FROM A VERTICAL SHEETED ZONE. |
| Deposit | THE RICHEST ORE MINED AT THE PORPHYRY DIKE MINE WAS REMOVED FROM A VERTICALLY SHEETED ZONE OF THOROUGH AND DEEP OXIDATION ALONG WHICH CONCENTRATION OF GOLD IN OPEN JOINTS COULD EASILY OCCUR |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-MAY-1977 | Mc Kenzie, Craig L.; R. B. Berg | U.S. Geological Survey | |
| Updater | 01-DEC-1981 | Wise, Kristine K. (Elliott, James E.) | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.