Little Maud Prospect, Kantishna Mining District, Denali Borough, Alaska, USAi
Regional Level Types | |
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Little Maud Prospect | Prospect |
Kantishna Mining District | Mining District |
Denali Borough | Borough |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
63° 32' 21'' North , 150° 57' 14'' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Mindat Locality ID:
198544
Long-form identifier:
mindat:1:2:198544:6
GUID (UUID V4):
3a926167-68f7-4c87-8f49-c7125f5a95cf
The claim is in Denali National Park and Preserve.
Location: The Little Maud prospect (Cobb, 1980 [OFR 80-363]) is on the southwest crest of Quigley Ridge at an elevation of about 2850 feet. It is about 0.25 mile south-southwest of the center of section 12, T. 16 S., R. 18 W., Fairbanks Meridian. The location is accurate within 300 feet. The prospect corresponds to claim number 14 of Hawley and Associates (1978); it is included with the Francis mine (MM124) in location 31 of Thornsberry, McKee, and Salisbury (1984), and in location 23 of Bundtzen (1981).
Geology: The country rocks at the Little Maud prospect are metafelsite and graphitic phyllite of the Spruce Creek sequence (Bundtzen, 1981; Thornsberry, McKee, and Salisbury, 1984). The deposit consists of mineralized quartz-calcite veins and breccia zones that cut graphitic schist (phyllite) and quartz schist, units that appear to be folded at an angle to the east-northeast trend of the Kantishna antiform (MM091) (Seraphim, 1962; Hawley and Associates (1978, fig. 4.1-1(A)-3). The veins strike NE and dip steeply. Davis (1923, p. 125) reported that an 18-inch-thick quartz-tetrahedrite vein was trenched immediately east of the Francis claim end line. A 13-foot-thick quartz vein, exposed in two trenches just north of the side line between the Little Maud and the Silver Pick (MM120) claims, strikes N55E. The vein contains pods and masses of fine-grained galena cut by veinlets of chalcopyrite. In one trench, the vein had a weighted average assay of 0.107 ounce of gold per ton and 53.3 ounces of silver per ton; in the other, the weighted average assay was 0.115 ounce of gold per ton and 22.6 ounces of silver per ton (Wells, 1933, p. 369). In 1983, The U.S. Bureau of Mines diamond-drilled this vein (Thornsberry, McKee, and Salisbury, 1984). The hole (K-5) cut a 31.5-foot-thick section of oxidized, quartz-calcite breccia containing arsenopyrite and small amounts of pyrite, chalcopyrite, sphalerite,and galena. The full 31.5-foot section assayed 0.022 ounce of gold per ton, 1.16 ounces of silver per ton, and 2.98 percent arsenic. The best 3.8-foot intercept assayed 0.082 ounce of gold per ton, 8.67 ounces of silver per ton, and 1.05 percent arsenic. Lead and zinc contents were in the 0.X percent range.
Workings: The Little Maud claim was prospected in about 1920 (Davis, 1923), and there was some activity in the 1930s (Wells, 1933). The Little Maud-Silver Pick-Francis claim area was extensively studied by Moneta-Porcupine in about 1960 (Seraphim, 1962). The area was also investigated by Hawley and Associates (1978) and Bundtzen (1981), and in 1983, the U.S. Bureau of Mines drilled one core hole (K-5) (Thornsberry, McKee, and Salisbury (1984, v. 2, occurrence 31).
Age: The deposit is assumed to be Eocene (see record MM091).
Alteration: Oxidation of iron minerals.
Commodities (Major) - Ag, Au, Pb; (Minor) - Cu
Development Status: Undetermined
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
8 valid minerals.
Detailed Mineral List:
β Arsenopyrite Formula: FeAsS |
β Calcite Formula: CaCO3 |
β Chalcopyrite Formula: CuFeS2 |
β Galena Formula: PbS |
β Gold Formula: Au |
β 'Limonite' |
β Pyrite Formula: FeS2 |
β Quartz Formula: SiO2 |
β Sphalerite Formula: ZnS |
β 'Tetrahedrite Subgroup' Formula: Cu6(Cu4C2+2)Sb4S12S |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
β | Gold | 1.AA.05 | Au |
Group 2 - Sulphides and Sulfosalts | |||
β | Sphalerite | 2.CB.05a | ZnS |
β | Chalcopyrite | 2.CB.10a | CuFeS2 |
β | Galena | 2.CD.10 | PbS |
β | Pyrite | 2.EB.05a | FeS2 |
β | Arsenopyrite | 2.EB.20 | FeAsS |
β | 'Tetrahedrite Subgroup' | 2.GB.05 | Cu6(Cu4C2+2)Sb4S12S |
Group 4 - Oxides and Hydroxides | |||
β | Quartz | 4.DA.05 | SiO2 |
Group 5 - Nitrates and Carbonates | |||
β | Calcite | 5.AB.05 | CaCO3 |
Unclassified | |||
β | 'Limonite' | - |
List of minerals for each chemical element
C | Carbon | |
---|---|---|
C | β Calcite | CaCO3 |
O | Oxygen | |
O | β Calcite | CaCO3 |
O | β Quartz | SiO2 |
Si | Silicon | |
Si | β Quartz | SiO2 |
S | Sulfur | |
S | β Arsenopyrite | FeAsS |
S | β Chalcopyrite | CuFeS2 |
S | β Galena | PbS |
S | β Pyrite | FeS2 |
S | β Sphalerite | ZnS |
S | β Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
Ca | Calcium | |
Ca | β Calcite | CaCO3 |
Fe | Iron | |
Fe | β Arsenopyrite | FeAsS |
Fe | β Chalcopyrite | CuFeS2 |
Fe | β Pyrite | FeS2 |
Cu | Copper | |
Cu | β Chalcopyrite | CuFeS2 |
Cu | β Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
Zn | Zinc | |
Zn | β Sphalerite | ZnS |
As | Arsenic | |
As | β Arsenopyrite | FeAsS |
Sb | Antimony | |
Sb | β Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
Au | Gold | |
Au | β Gold | Au |
Pb | Lead | |
Pb | β Galena | PbS |
Other Databases
Link to USGS - Alaska: | MM119 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
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