Brooker Mountain Prospect, Kantishna Mining District, Denali Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Brooker Mountain Prospect | Prospect |
| Kantishna Mining District | Mining District |
| Denali Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
63° 30' 7'' North , 151° 3' 3'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
The prospect is in Denali National Park and Preserve.
Location: This prospect is at an elevation of about 3450 feet on the northeast flank of Brooker Mountain above Reinhart Creek . It is about 800 feet north-northwest of the center of section 23, T. 16 S., R. 18 W., Fairbanks Meridian. The location is accurate within about 500 feet. The prospect is number 2 of Bundtzen, Smith and Tosdal (1976), Bundtzen (1981), and Thornsberry, McKee and Salisbury (1984), and number 21 of Hawley and Associates (1978).
Geology: The country rock at this prospect is chlorite-quartz-muscovite schist of the Birch Creek Schist (Bundtzen, 1981, p. 206). A polymetallic quartz vein is poorly exposed but appears to be nearly vertical and to strike about N 60 E. The vein is pyritic and locally oxidized to limonite. The quartz locally contains as much as several percent of stibnite. A limonitic quartz vein assayed 1.18 percent lead, 12.1 ounces of silver per ton, 0.63 percent antimony and 0.26 percent bismuth (Bundtzen, 1981, p. 198, 211) . T. K. Hinderman collected a gossan sample that contained 3 percent lead, 4900 ppm silver, 1.6 ppm gold, and 1.55 percent antimony (Thornsberry, McKee, and Salisbury, 1984, v. 2, occurrence 2). The presence of galena or possibly its oxidation product cerussite is inferred from the lead content of samples of vein material and gossan.
Workings: The prospect was explored by a shallow, 65-foot-long bulldozer trench and a small pit. Workings are sloughed and timber at the site for a cabin had rotted by 1983.
Age: The deposit is assumed to be Eocene (see record MM091).
Alteration: Iron-oxide alteration. Possible oxidation of lead mineral.
Commodities (Major) - Sb; (Minor) - Ag, Au, Bi, Pb, Zn
Development Status: No
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c).
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
5 valid minerals.
Detailed Mineral List:
| ⓘ Cerussite ? Formula: PbCO3 |
| ⓘ Galena Formula: PbS |
| ⓘ 'Limonite' |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Stibiconite Formula: Sb3+Sb5+2O6(OH) |
| ⓘ Stibnite Formula: Sb2S3 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Stibnite | 2.DB.05 | Sb2S3 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | Stibiconite | 4.DH.20 | Sb3+Sb5+2O6(OH) |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Cerussite ? | 5.AB.15 | PbCO3 |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Stibiconite | Sb3+Sb25+O6(OH) |
| C | Carbon | |
| C | ⓘ Cerussite | PbCO3 |
| O | Oxygen | |
| O | ⓘ Cerussite | PbCO3 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Stibiconite | Sb3+Sb25+O6(OH) |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Galena | PbS |
| S | ⓘ Stibnite | Sb2S3 |
| Sb | Antimony | |
| Sb | ⓘ Stibiconite | Sb3+Sb25+O6(OH) |
| Sb | ⓘ Stibnite | Sb2S3 |
| Pb | Lead | |
| Pb | ⓘ Cerussite | PbCO3 |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS - Alaska: | MM031 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- North America PlatformPassive Margin
- Yukon-Tanana lower DomainDomain
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