Boeing Prospect (Flynn Fluorite & Gold; Flynn Property), Greenhorn Mining District (Austin Mining District), Lewis and Clark County, Montana, USAi
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Latitude & Longitude (WGS84):
46° 38' 59'' North , 112° 18' 15'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Elliston | 219 (2011) | 13.7km |
| Helena West Side | 1,637 (2011) | 15.7km |
| Helena Valley West Central | 7,883 (2011) | 18.6km |
| Helena Valley Northwest | 3,482 (2011) | 20.4km |
| Helena | 30,581 (2017) | 21.4km |
REF:Deposit:: USGS BULL-955-E, P. 210-13,
Deposit:: MBMG BULL 28, P. 24.
Deposit:: MBM G MEM 20, 1940 P.49
Commodities (Major) - Fluorine-Fluorite; (Minor) - Lead, Silver, Gold, Copper
Development Status: Past Producer
Host Rock Unit: Quadrant Formation
Structure: Boulder Batholith
Host Rock: Limestone
At the-time of the writer's visit in 1944 the workings on the Boeing
fluorspar deposit included a tunnel over 60 feet long, broken near its
northern end by an open pit (see fig. 9). A winze 16 feet deep has
been sunk in the floor of the tunnel. A crosscut extends about 10
feet west from the bottom of the winze. Pits and trenches in the
vicinity of these workings appear to contain almost no fluorspar.
Scholz noted a little fluorspar in the altered dike rock 60 feet south-
east of the tunnel dump. In the main workings fluorite is dissemi-
nated in irregular masses in those parts of the limestone in which
silicification has not been intense. The principal exposure is in the
northwest corner of the open pit where banded fluorspar that strikes
N. 20° W., and dips 70° to 80° SW., is exposed in the steep face, pic-
tured in plate 26, over an area about 3 feet wide in its lower part, nearly
6 feet wide near the top, and a little more than 7 feet in maximum
height. The lower part of this face is covered by slide material which
may conceal some fluorspar. One narrow band with conspicuous
fluorite is visible west of the main area, and some fluorite is dissemi-
nated in the limestone between that area and the dike to the east.
A small quantity of fluorite has formed within the dike rock also.
Fluorite is fairly plentiful in the southeastern wall of the open cut
just northeast of the winze. Probably a zone containing fluorite in
abundance extends from this place diagonally across the open pit
to the face previously described (as indicated by dashed lines in
figure 9). Fluorspar is exposed also in the northwest corner of the
crosscut from the bottom of the winze.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
3 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ 'Biotite' Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| ⓘ Fluorite Formula: CaF2 |
| ⓘ Montmorillonite Formula: (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 3 - Halides | |||
|---|---|---|---|
| ⓘ | Fluorite | 3.AB.25 | CaF2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| ⓘ | Montmorillonite | 9.EC.40 | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| Unclassified | |||
| ⓘ | 'Biotite' | - | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| H | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| O | Oxygen | |
| O | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| O | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| O | ⓘ Quartz | SiO2 |
| F | Fluorine | |
| F | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| F | ⓘ Fluorite | CaF2 |
| Na | Sodium | |
| Na | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| Mg | Magnesium | |
| Mg | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Mg | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| Al | Aluminium | |
| Al | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Al | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| Si | Silicon | |
| Si | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Si | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| Si | ⓘ Quartz | SiO2 |
| K | Potassium | |
| K | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Ca | Calcium | |
| Ca | ⓘ Fluorite | CaF2 |
| Ca | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| Ti | Titanium | |
| Ti | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Fe | Iron | |
| Fe | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Other Databases
| Link to USGS MRDS: | 10008975 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Rocky MountainsMountain Range
North America PlateTectonic Plate
- Belt BasinBasin
- Northern Rocky MountainsWide Rift
- Wallace DomainDomain
USA
- Montana
- Western Phosphate fieldMineral Province
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Boeing Prospect, Greenhorn Mining District, Lewis and Clark County, Montana, USA