Unnamed Occurrence (ARDF - HU003; in the Helpmejack Hills), Koyukuk Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - HU003; in the Helpmejack Hills) | - not defined - |
| Koyukuk Mining District | Mining District |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
66° 59' 52'' North , 153° 52' 58'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is north of the Helpmejack Hills, about 10 miles west-northwest of Helpmejack Lakes and about 18 miles northeast of Norutak Lake. It is at an elevation of about 3,400 feet in the SW 1/4 of section 32, T. 19 N., R. 23 E., of the Kateel River Meridian. The location is accurate within 1 mile.
Geology: Rhodochrosite, manganite, and pyrolusite occur in Devonian(?) altered mafic volcanic rocks and phyllite (Patton and Miller, 1966). Field investigators in the 1990's were not able to locate the occurrence (Kurtak and others, 2002). No other information is available.
Commodities (Major) - Mn
Development Status: None
Deposit Model: Volcanogenic Mn(?) (Cox and Singer, 1986; model 24c)
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:
| ⓘ Manganite Formula: Mn3+O(OH) |
| ⓘ Pyrolusite Formula: Mn4+O2 |
| ⓘ Rhodochrosite Formula: MnCO3 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Pyrolusite | 4.DB.05 | Mn4+O2 |
| ⓘ | Manganite | 4.FD.15 | Mn3+O(OH) |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Rhodochrosite | 5.AB.05 | MnCO3 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Manganite | Mn3+O(OH) |
| C | Carbon | |
| C | ⓘ Rhodochrosite | MnCO3 |
| O | Oxygen | |
| O | ⓘ Manganite | Mn3+O(OH) |
| O | ⓘ Pyrolusite | Mn4+O2 |
| O | ⓘ Rhodochrosite | MnCO3 |
| Mn | Manganese | |
| Mn | ⓘ Manganite | Mn3+O(OH) |
| Mn | ⓘ Pyrolusite | Mn4+O2 |
| Mn | ⓘ Rhodochrosite | MnCO3 |
Other Databases
| Link to USGS - Alaska: | HU003 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Brooks RangeMountain Range
- Rocky MountainsMountain Range
North America PlateTectonic Plate
- Angayucham TerraneAccretionary Complex
- Brooks Range DomainVolcanic Arc
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.
