Lloyd Prospect, Kantishna Mining District, Denali Borough, Alaska, USAi
Regional Level Types | |
---|---|
Lloyd Prospect | Prospect |
Kantishna Mining District | Mining District |
Denali Borough | Borough |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
63° 33' 50'' North , 150° 43' 51'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Mindat Locality ID:
198568
Long-form identifier:
mindat:1:2:198568:2
GUID (UUID V4):
dd5ffb47-0b4a-4e0f-8f53-fe0111356d2d
The prospect is in Denali National Park and Preserve.
Location: The Lloyd prospect (Cobb, 1980 [OFR 80-363]) is in the canyon of the East Fork of Glen Creek, about 1500 feet due north of the confluence of the East and West forks of Glen Creek. The location is accurate within 500 feet. The prospect corresponds to number 21 of Cobb (1972 [MF 366]), 52 of Bundtzen, Smith, and Tosdal (1976), 56 of Bundtzen (1981), 239 of Hawley and Associates (1978), and 77 of Thornsberry, McKee, and Salisbury (1984).
Geology: The country rocks in the area of the Lloyd prospect are metachert (quartzite?) and garnet-quartz-muscovite schist of the upper Precambrian Birch Creek Schist (Bundtzen, 1981). The strata dip gently north and form asymmetric recumbent folds that plunge about S80W at a low angle (Thornsberry, McKee, and Salisbury, 1984, v. 2, occurrence 77). The deposit consists of stratiform sulfide minerals concentrated in bands up to about 1/2 inch thick in a metachert layer as much as 3 feet thick. The sulfide-rich layers appear to thicken in fold crests. Sphalerite is the most abundant metallic mineral. It is accompanied by pyrite and lesser amounts of chalcopyrite, galena, and magnetite (Bundtzen, 1981). Outcrops are coated with azurite, malachite, and smithsonite. A 5-foot channel sample of a section thicked by folding assayed about 0.15 ounce of silver per ton, 2.2 percent zinc, 0.355 percent copper, and 0.07 percent lead. A selected sample of the richest material on the dump assayed 0.85 ounce of silver per ton, 5.6 percent zinc, 1.1 percent copper, and 0.215 percent lead (Thornsberry, McKee, and Salisbury, 1984, v. 2, occurrence 77). Bundtzen (1981) reported that another selected sample assayed 0.01 ounce of gold per ton. This stratabound deposit predates recumbent folding of the Birch Creek Schist. It appears to be a zinc-rich, syngenetic, volcanogenic deposit of late Precambrian age.
Workings: The Lloyd prospect explored by a 24-foot-long tunnel before 1916 (Capps, 1919). Very little work has been done since then.
Age: Possibly late Precambrian, the protolith age of the Birch Creek Schist.
Alteration: Oxidation of copper and zinc minerals.
Commodities (Major) - Cu, Zn; (Minor) - Ag, Pb
Development Status: None
Deposit Model: Stratabound base-metal sulfide deposit, possibly of exhalative origin.
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
9 valid minerals.
Detailed Mineral List:
ⓘ Azurite Formula: Cu3(CO3)2(OH)2 |
ⓘ Chalcopyrite Formula: CuFeS2 |
ⓘ Galena Formula: PbS |
ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
ⓘ Malachite Formula: Cu2(CO3)(OH)2 |
ⓘ Pyrite Formula: FeS2 |
ⓘ Quartz Formula: SiO2 |
ⓘ Smithsonite Formula: ZnCO3 |
ⓘ Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
ⓘ | Sphalerite | 2.CB.05a | ZnS |
ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
ⓘ | Galena | 2.CD.10 | PbS |
ⓘ | Pyrite | 2.EB.05a | FeS2 |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
ⓘ | Quartz | 4.DA.05 | SiO2 |
Group 5 - Nitrates and Carbonates | |||
ⓘ | Smithsonite | 5.AB.05 | ZnCO3 |
ⓘ | Azurite | 5.BA.05 | Cu3(CO3)2(OH)2 |
ⓘ | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Azurite | Cu3(CO3)2(OH)2 |
H | ⓘ Malachite | Cu2(CO3)(OH)2 |
C | Carbon | |
C | ⓘ Azurite | Cu3(CO3)2(OH)2 |
C | ⓘ Malachite | Cu2(CO3)(OH)2 |
C | ⓘ Smithsonite | ZnCO3 |
O | Oxygen | |
O | ⓘ Azurite | Cu3(CO3)2(OH)2 |
O | ⓘ Magnetite | Fe2+Fe23+O4 |
O | ⓘ Malachite | Cu2(CO3)(OH)2 |
O | ⓘ Quartz | SiO2 |
O | ⓘ Smithsonite | ZnCO3 |
Si | Silicon | |
Si | ⓘ Quartz | SiO2 |
S | Sulfur | |
S | ⓘ Chalcopyrite | CuFeS2 |
S | ⓘ Galena | PbS |
S | ⓘ Pyrite | FeS2 |
S | ⓘ Sphalerite | ZnS |
Fe | Iron | |
Fe | ⓘ Chalcopyrite | CuFeS2 |
Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
Fe | ⓘ Pyrite | FeS2 |
Cu | Copper | |
Cu | ⓘ Azurite | Cu3(CO3)2(OH)2 |
Cu | ⓘ Chalcopyrite | CuFeS2 |
Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
Zn | Zinc | |
Zn | ⓘ Smithsonite | ZnCO3 |
Zn | ⓘ Sphalerite | ZnS |
Pb | Lead | |
Pb | ⓘ Galena | PbS |
Other Databases
Link to USGS - Alaska: | MM078 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
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