Last Chance Vein (Granite Mountain Vein), Cornucopia Mine, Cornucopia, Cornucopia Mining District, Baker County, Oregon, USAi
| Regional Level Types | |
|---|---|
| Last Chance Vein (Granite Mountain Vein) | Vein |
| Cornucopia Mine | Mine |
| Cornucopia | Town |
| Cornucopia Mining District | Mining District |
| Baker County | County |
| Oregon | State |
| USA | Country |
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
45° 1' 21'' North , 117° 13' 0'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Halfway | 291 (2017) | 17.7km |
| Richland | 176 (2017) | 28.4km |
| Joseph | 1,063 (2017) | 36.9km |
| Enterprise | 1,893 (2017) | 45.1km |
| Lostine | 209 (2017) | 54.3km |
Mindat Locality ID:
149904
Long-form identifier:
mindat:1:2:149904:2
GUID (UUID V4):
c99c26a6-17ec-4a8b-ae3a-6a745e370524
A former Pb-Cu-Ag-Au-Zn-Te-As occurrence/mine located in sec. 28, T6S, R45E, WM, 2.5 km (1.5 miles) NW of Cornucopia (site), on National Forest land. Owned by the Forest Industries Insurance Management Company. MRDS database accuracy for this location is not stated.
The Last Chance vein is one of several veins worked by the Cornucopia Mine. Others include the Whitman, Union-Companion, Wallingford and Valley View. Most of the production was from the Union-Companion and Last Chance veins.
Mineralization is hosted in rocks of the Canyon Mountain Complex (granodiorite of the Cornucopia stock, hornblendite, schist and hornfels). The ore body strikes N20E and dips 45W with a width of 2.13 meters and a length of 975.36 meters. Controls for ore emplacement
included pre-Tertiary faults that trend NNE. The deposit involves granodiorite stock and aplite dikes. The vein is mainly quartz with local inclusions of altered host rocks and gouge. The vein crops out at about 7,000 feet of elevation, about 2,500 feet horizontally NW of the Union-Companion vein and about 1½ miles NW of, and 3,000 feet above Cornucopia townsite. Local rocks include intrusive rocks (Cretaceous and Jurassic).
Related tectonic structures: Eugeosyncline.
Workings include underground openings. The vein has been developed and mined to a depth of 2,000 feet below the outcrop.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Coloradoite Formula: HgTe |
| ⓘ Galena Formula: PbS |
| ⓘ Gold Formula: Au References: |
| ⓘ Hessite Formula: Ag2Te |
| ⓘ Petzite Formula: Ag3AuTe2 |
| ⓘ Quartz Formula: SiO2 References: |
| ⓘ Sphalerite Formula: ZnS |
| ⓘ Stützite Formula: Ag5-xTe3, x = 0.24-0.36 |
| ⓘ Sylvanite Formula: AgAuTe4 |
| ⓘ 'Tetrahedrite Subgroup' Formula: Cu6(Cu4C2+2)Sb4S12S |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Hessite | 2.BA.60 | Ag2Te |
| ⓘ | Stützite | 2.BA.65 | Ag5-xTe3, x = 0.24-0.36 |
| ⓘ | Petzite | 2.BA.75 | Ag3AuTe2 |
| ⓘ | Coloradoite | 2.CB.05a | HgTe |
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Sylvanite | 2.EA.05 | AgAuTe4 |
| ⓘ | 'Tetrahedrite Subgroup' | 2.GB.05 | Cu6(Cu4C2+2)Sb4S12S |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Galena | PbS |
| S | ⓘ Sphalerite | ZnS |
| S | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Cu | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Ag | Silver | |
| Ag | ⓘ Hessite | Ag2Te |
| Ag | ⓘ Petzite | Ag3AuTe2 |
| Ag | ⓘ Stützite | Ag5-xTe3, x = 0.24-0.36 |
| Ag | ⓘ Sylvanite | AgAuTe4 |
| Sb | Antimony | |
| Sb | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Te | Tellurium | |
| Te | ⓘ Coloradoite | HgTe |
| Te | ⓘ Hessite | Ag2Te |
| Te | ⓘ Petzite | Ag3AuTe2 |
| Te | ⓘ Stützite | Ag5-xTe3, x = 0.24-0.36 |
| Te | ⓘ Sylvanite | AgAuTe4 |
| Au | Gold | |
| Au | ⓘ Gold | Au |
| Au | ⓘ Petzite | Ag3AuTe2 |
| Au | ⓘ Sylvanite | AgAuTe4 |
| Hg | Mercury | |
| Hg | ⓘ Coloradoite | HgTe |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS MRDS: | 10102961 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Foothills-Wallowa DomainDomain
This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.
References
