Dyckman Occurrence, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Dyckman Occurrence | Occurrence |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
63° 50' 16'' North , 153° 12' 10'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Location: This occurrence is located near the summit of Dyckman Mountain at an elevation of 1,870 feet (570 m) in Section 16, T. 19 S., R. 29 E., of the Kateel River Meridian. The site is accurately located to within 100 feet (30 m).
Geology: The Dyckman occurrence consists of disseminated arsenopyrite in an intensively altered, rhyolite volcanic (?) breccia. Extensive clay alteration has completely altered all feldspar minerals. The alteration zone was traceable for nearly 500 feet (152 m) along strike. The width of the zone is unknown. The mineral occurrence is inferred to be Cretaceous, based on isotopic age of host rhyolite (Moll and others, 1981). Two grab samples contained 350 ppm zinc and 234 ppm arsenic (Clautice and others, 1993). One sample contained 9 ppb gold (Clautice and others, 1993). DiMarchi and others (1992) report values of 1,630 ppm molybdenum and 574 ppm arsenic from limonitically stained zones in rhyolitic breccia on Dyckman Mountain.
Workings: Two grab samples contained 350 ppm zinc and 234 ppm arsenic (Clautice and others, 1993). One sample contained 9 ppb gold (Clautice and others, 1993). DiMarchi and others (1992) report values of 1,630 ppm molybdenum and 574 ppm arsenic from limonitically stained zones in rhyolitic breccia on Dyckman Mountain.
Age: Inferred to be Cretaceous, based on isotopic age of host rhyolite (Moll and others, 1981).
Alteration: Intensive clay alteration of feldspars; chalcedonic replacements in rhyolitic breccias.
Reserves: None.
Commodities (Major) - As, Mo, Zn; (Minor) - Au
Development Status: No
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
3 valid minerals.
Detailed Mineral List:
| ⓘ Arsenopyrite Formula: FeAsS |
| ⓘ Hematite Formula: Fe2O3 |
| ⓘ Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Hematite | Fe2O3 |
| S | Sulfur | |
| S | ⓘ Arsenopyrite | FeAsS |
| S | ⓘ Sphalerite | ZnS |
| Fe | Iron | |
| Fe | ⓘ Arsenopyrite | FeAsS |
| Fe | ⓘ Hematite | Fe2O3 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
Other Databases
| Link to USGS - Alaska: | MD008 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell-McGrath DomainDomain
- Farewell TerranePassive Margin
USA
- Alaska
- Yukon-Koyukuk Census Area
- McGrath Mining DistrictMining District
- Yukon-Koyukuk Census Area
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