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Spokane Bar (American Gem Corp.; Spokane Bar Sapphire Mine), Lewis and Clark Co., Montana, USAi
Regional Level Types
Spokane Bar (American Gem Corp.; Spokane Bar Sapphire Mine)- not defined -
Lewis and Clark Co.County
MontanaState
USACountry

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Key
Latitude & Longitude (WGS84):
46° 40' 2'' North , 111° 48' 55'' West
Latitude & Longitude (decimal):
Nearest Settlements:
PlacePopulationDistance
Helena Valley Southeast8,227 (2011)10.0km
Helena Valley Northeast2,995 (2011)11.0km
East Helena2,057 (2017)11.5km
Montana City2,715 (2011)17.0km
South Hills517 (2017)18.6km


Sec. 35, T 11 N, R 2 W.
Commodities (Major) - Gold; (Trace) - Gemstone, Gemstone - Sapphire
Development Status: Past Producer

Regions containing this locality

North America PlateTectonic Plate
Rocky Mountains, North AmericaMountain Range

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


4 valid minerals.

Detailed Mineral List:

Almandine
Formula: Fe2+3Al2(SiO4)3
Reference: Gobla, M.J. (2012) Montana mineral locality index. Rocks & Minerals, 87, #3, 208-240; Chris Tucker and John Betts specimens.
Corundum
Formula: Al2O3
Reference: Mike Royal specimen
Corundum var: Sapphire
Formula: Al2O3
Reference: Mike Royal specimen
Gold
Formula: Au
Reference: Gobla, M.J. (2012) Montana mineral locality index. Rocks & Minerals, 87, #3, 208-240; Chris Tucker and John Betts specimens.
Topaz
Formula: Al2(SiO4)(F,OH)2
Reference: Gobla, M.J. (2012) Montana mineral locality index. Rocks & Minerals, 87, #3, 208-240; Chris Tucker and John Betts specimens.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 4 - Oxides and Hydroxides
Corundum4.CB.05Al2O3
var: Sapphire4.CB.05Al2O3
Group 9 - Silicates
Almandine9.AD.25Fe2+3Al2(SiO4)3
Topaz9.AF.35Al2(SiO4)(F,OH)2

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 4 - SIMPLE OXIDES
A2X3
Corundum4.3.1.1Al2O3
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Almandine51.4.3a.2Fe2+3Al2(SiO4)3
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
Topaz52.3.1.1Al2(SiO4)(F,OH)2
Unclassified Minerals, Mixtures, etc.
Corundum
var: Sapphire
-Al2O3

List of minerals for each chemical element

HHydrogen
H TopazAl2(SiO4)(F,OH)2
OOxygen
O CorundumAl2O3
O Corundum (var: Sapphire)Al2O3
O AlmandineFe32+Al2(SiO4)3
O TopazAl2(SiO4)(F,OH)2
FFluorine
F TopazAl2(SiO4)(F,OH)2
AlAluminium
Al CorundumAl2O3
Al Corundum (var: Sapphire)Al2O3
Al AlmandineFe32+Al2(SiO4)3
Al TopazAl2(SiO4)(F,OH)2
SiSilicon
Si AlmandineFe32+Al2(SiO4)3
Si TopazAl2(SiO4)(F,OH)2
FeIron
Fe AlmandineFe32+Al2(SiO4)3
AuGold
Au GoldAu

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
MONTANA BUREAU OF MINES & GEOLOGY MEMOIR 26, 1948, P. 72.
PERSONAL COMMUNICATION WITH ROBIN MUCCULLUCH; MONTANA BUREAU OF MINES & GEOLOGY, BUTTE, MT., AUGUST 1995.
U.S. BUREAU OF MINES, 1994, DIRECTORY OF PRI

USGS MRDS Record:10173041
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