Mak North Prospect, Aleutians Mining District, Aleutians West Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Mak North Prospect | Prospect |
| Aleutians Mining District | Mining District |
| Aleutians West Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
53° 56' 32'' North , 166° 39' 7'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Dutch Harbor | 4,376 (2018) | 9.2km |
| Unalaska | 4,491 (2017) | 10.7km |
See also UN009, UN011
Location: Located approximately 2,500 m north of Makushin River on northernmost ridge between Broad and Wide Bays. Occurrence extends for at least 9,000 feet (2,800 m) in an east-west direction. Latitude and longitude is of central point of vein system.
Geology: Very similar to Makushin Valley (UN009) vein; in particular the east-west trending part of the Makushin Valley vein system. Quartz veins occur in propylitically altered porphyritic andesite and andesitic volcaniclastic rocks of the Unalaska Formation (see Drewes and others, 1961). The Mak North vein system is intermittently exposed over a lateral distance of at least 9,000 feet (2,800 m) and a vertical distance of 1,000 feet (300 m). The veins are composed of massive, milky quartz that has been brecciated and then healed by multiple void-filling bands of cockscomb quartz. The Mak North vein system has a reported range in thickness from 2 to 20 feet (0.7 to 7 m).
Workings: The main or 'discovery' zone was originally located from the air and was channel sampled using a line spacing of roughly 15 m. This sampling outlined a length of about 60 m having gold values averaging 0.024 oz/t (0.82 ppm), and having a highest value of 0.034 oz/t (1.17 ppm) over 7.5 m. Other sampling of the vein yielded gold values as high as 690 ppb. the veins have identical Au/Ag/Hg/As and base metal signatures as the east-west veins in the Makushin Valley (UN009) occurrence (Randolph, 1991).
Age: Late Tertiary or younger
Alteration: Regional propylitic alteration; no apparent wall-rock alteration around vein.
Commodities (Major) - Au, Ag; (Minor) - As, Hg
Development Status: No
Deposit Model: Epithermal gold vein
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.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS - Alaska: | UN010 |
|---|
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