Unnamed Occurrences (ARDF - NL025; west of upper Illinois Creek), Kaiyuh Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrences (ARDF - NL025; west of upper Illinois Creek) | - not defined - |
| Kaiyuh Mining District | Mining District |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
64° 2' 56'' North , 157° 56' 13'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This site consists of two occurrences, informally called Madelyn's gossan and Nate's gossan. Madelyn's gossan is located near the summit of locally-named 'Survey Ridge,' a prominent, east-west-trending ridge about a mile west of upper Illinois Creek. For this record, the site is plotted at an elevation of 1000 feet, near the center of the N1/2 of sec. 5, T. 17 S., R. 5 E., Kateel River Meridian. The location is accurate within 2 miles. Nate's gossan is approximately 1.2 miles east-northeast of Madelyn's gossan.
Geology: Madelyn's gossan consists of sparse, limonitic, quartzite float. Samples contain 10-20% banded limonite after pyrite. Analyses of four rock samples show only slightly anomalous values, including up to 226 ppm zinc, 2.3 ppm silver, and 30 ppb gold (Flanigan, 1998). Nate's gossan is a small outcrop (10 by 50 meters) of limonitic, brecciated quartzite. The limonite replaces banded and veined sulfides (pyrite?). Traces of malachite occur in nearby graphitic schist. Four rock samples contained up to 80 ppm copper, 308 ppm zinc, 1.0 ppm silver, and 25 ppb gold (Flanigan, 1998).
Workings: These occurrences were discovered by Anaconda Minerals Company in 1980; geologic mapping and sampling followed (Flanigan, 1998).
Age: The nearby Khotol pluton has been dated by K-Ar and Ar/Ar methods at 108-112 Ma (Flanigan, 1998). Flanigan links these occurrences to magmatic fluids from that pluton.
Alteration: Sulfides are oxidized to limonite, and, locally, to malachite (Flanigan, 1998).
Commodities (Major) - Ag, Zn; (Minor) - Au
Development Status: None
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
2 valid minerals.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Malachite | Cu2(CO3)(OH)2 |
| C | Carbon | |
| C | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | Oxygen | |
| O | ⓘ Malachite | Cu2(CO3)(OH)2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
Other Databases
| Link to USGS - Alaska: | NL025 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Ruby DomainDomain
- Ruby TerraneAccretionary Complex
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