Gagaryah Occurrence, McGrath Mining District, Bethel Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Gagaryah Occurrence | Occurrence |
| McGrath Mining District | Mining District |
| Bethel Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
61° 49' 30'' North , 154° 28' 22'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Location: This occurrence is in the easternmost headwaters of the Gagaryah River near a low divide with a creek draining northwest to Big River. It is at an elevation of 2,500 feet and 0.6 mile southeast of peak 3125. The map site is in the NE1/4 section 14, T 20 W, R 29 W, of the Seward Meridian. This location is from Bundtzen and Gilbert (1991, figs. 1 and 2).
Geology: This occurrence consists of nodular, laminated, composite, and massive light-gray to light blueish-gray barite interbedded with Devonian (Frasnian) shale and siltstone (Bundtzen and Gilbert, 1991). The barite-rich intervals are at least 640 m long and vary from 6 or 7 m to as much as 39 m thick. The barite does not contain significant amounts of other elements including strontium, silver, lead, or zinc. Bundtzen and Gilbert (1991, p. 15) estimate that the deposit contains 2.3 million tonnes with an overall average grade of 57 percent barite. The setting and character of the Gagaryah deposit is similar to Middle to Upper Devonian barite deposits in northeastern British Columbia and the Selwyn Basin of central Yukon Territory (Bundtzen and Gilbert, 1991).
Workings: Surface observation and sampling have been completed on this deposit.
Age: Devonian. Two brachiopod-rich fossil localities that are 50 to 60 meters stratigraphically above the barite-bearing interval are Frasnian in age (Gilbert and others, 1990).
Reserves: The deposit is estimated to contain 2.3 million tonnes with an overall average grade of 57 percent barite.
Commodities (Major) - Ba
Development Status: None
Deposit Model: Bedded barite (Cox and Singer, 1986, model 31b)
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Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
2 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
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Alphabetical List Tree DiagramGallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Baryte | 7.AD.35 | BaSO4 |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Baryte | BaSO4 |
| S | Sulfur | |
| S | ⓘ Baryte | BaSO4 |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Ba | Barium | |
| Ba | ⓘ Baryte | BaSO4 |
Other Databases
| Link to USGS - Alaska: | LH002 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell-McGrath DomainDomain
- Farewell TerranePassive Margin
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