Kagati Lake Prospect, Bethel Mining District, Dillingham Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Kagati Lake Prospect | Prospect |
| Bethel Mining District | Mining District |
| Dillingham Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
59° 55' 12'' North , 159° 54' 36'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Location: The Kagati Lake prospect is in uplands in the headwaters of Atmugiak Creek, 5.5 miles northeast of Kagati Lake. It is at an elevation of about 3,400 feet above the small, east-headwater lake to Atmugiak Creek. It is locality 1 of Hoare and Cobb (1977) and of Cobb and Condon (1972).
Geology: The Kagati Lake prospect is within a Cretaceous granitic pluton (Hoare and Coonrad, 1978). It was discovered and prospected by 1927 (Malone, 1962) but explored mostly in the 1950s (Sainsbury and MacKevett, 1965). North-northwest-trending fractures and shear zones up to 1,200 feet long and approximately parallel to steep joints in the host granitic rock control mineralization. Cinnabar, some closely associated with realgar, stibnite, and minor orpiment, forms veinlets and fills fractures in the shear zones. Individual cinnabar masses are 2 to 24 inches wide, but are observed only for lengths up to 10 feet due to limited exposure. Quartz, some vuggy, and clay accompany the cinnabar; secondary antimony minerals and iron-oxides are also present. Frost (1990, p. C5) describes the veins as zoned with margins of blue-green to brown tourmaline needles extending into a core of quartz and calcite; cinnabar and stibnite crystals with some realgar and orpiment are scattered through quartz in the cores of the veins. Gold values up to 2.9 ppm were obtained on vein material (Frost, 1990; Gray and others, 1990).
Workings: Exploration includes pits, trenches, and dozer stripping; surface mapping was completed in the 1950s (Sainsbury and MaKevett, 1965).
Age: Late Cretaceous or Tertiary. The mineralization postdates the host granitic pluton, which yielded a K/Ar age of 71.1 +/- 2.1 Ma on biotite (Hoare and Coonrad, 1978).
Alteration: Silicification and oxidation.
Commodities (Major) - Au, Hg, Sb
Development Status: None
Deposit Model: Epithermal mercury- and antimony-bearing veins in granitic rock
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
6 valid minerals.
Detailed Mineral List:
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Cinnabar Formula: HgS |
| ⓘ Orpiment Formula: As2S3 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Realgar Formula: As4S4 |
| ⓘ Stibnite Formula: Sb2S3 |
| ⓘ 'Tourmaline' Formula: AD3G6(T6O18)(BO3)3X3Z |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Cinnabar | 2.CD.15a | HgS |
| ⓘ | Stibnite | 2.DB.05 | Sb2S3 |
| ⓘ | Realgar | 2.FA.15a | As4S4 |
| ⓘ | Orpiment | 2.FA.30 | As2S3 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| Unclassified | |||
| ⓘ | 'Tourmaline' | - | AD3G6(T6O18)(BO3)3X3Z |
List of minerals for each chemical element
| B | Boron | |
|---|---|---|
| B | ⓘ Tourmaline | AD3G6(T6O18)(BO3)3X3Z |
| C | Carbon | |
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Tourmaline | AD3G6(T6O18)(BO3)3X3Z |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Cinnabar | HgS |
| S | ⓘ Orpiment | As2S3 |
| S | ⓘ Realgar | As4S4 |
| S | ⓘ Stibnite | Sb2S3 |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| As | Arsenic | |
| As | ⓘ Orpiment | As2S3 |
| As | ⓘ Realgar | As4S4 |
| Sb | Antimony | |
| Sb | ⓘ Stibnite | Sb2S3 |
| Hg | Mercury | |
| Hg | ⓘ Cinnabar | HgS |
Other Databases
| Link to USGS - Alaska: | GO011 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Koyukuk ArcsVolcanic Arc
- Walrus-Togiak DomainDomain
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