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Khotol Ridge

Occurrence in Alaska, United States with commodities Lead, Zinc, Silver, Gold, Copper
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Geologic information

Identification information

Deposit ID 10307895
Record type Site
Current site name Khotol Ridge
Alternate or previous names Sunny Day, Honkette

Geographic coordinates

Geographic coordinates: -157.80311, 64.19944 (WGS84)
Relative position This site consists of three small occurrences of gossan in the vicinity of Khotol Mountain. They are informally called Khotol Ridge, Sunny Day, and Honkette. They share similar geologic characteristics and are a mile or so apart. The coordinates are for the approximate location of the Khotol Ridge gossan, at an elevation of 1900 feet on the northwest flank of hill 2047, a northeast-trending ridge of Khotol Mountain. It is in the NW1/4 sec. 23, T. 15 S., R. 5 E., Kateel River Meridian. This location is accurate within 2 miles. The Sunny Day gossan is 1.65 miles south-southwest of the Khotol Ridge gossan, and the Honkette gossan is 1.15 miles west-southwest of it.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Lead Primary
Zinc Primary
Silver Secondary
Gold Secondary
Copper Secondary

Materials information

Materials Type of material
Limonite Gangue

Alteration

  • (Local) Locally conspicuous iron-oxide alteration.

Nearby scientific data

(1) -157.80311, 64.19944
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Comments on the geologic information

  • Geologic Description = The Khotol Ridge gossan is associated with biotite granite of the Khotol pluton, quartz-mica schist, quartzite, and minor graphitic schist. A transitional phase of quartz-eye biotite schist occurs along the contact between the Khotol pluton and the quartz-mica schist. This quartz-mica schist overlies the quartzite, strikes northeast, and dips approximately 40 degrees southeast. The quartzite resembles that at the nearby Illinois Creek mine (NL023) and commonly contains euhedral limonite pits after pyrite. The quartzite unit can be traced nearly continuously for over 10 km from hill 1677 (NL015) southwest through the Sunny Day gossan to just south of the Honker prospect (NL018). Grab and soil samples at Khotol Ridge contain up to 231 ppm copper, 6750 ppm lead, 1190 ppm zinc, 16 ppm silver, 3600 ppm manganese, 850 ppm arsenic, and 40 ppb gold (Flanigan, 1998). The Sunny Day gossan consists of scattered limonite-quartzite breccia and minor massive, vuggy, gossan float. It is in an east-west trending gully coincident with an airphoto lineament. Quartzite in this area is similar to quartzite at Illinois Creek (NL023) and Khotol Ridge. Several soil, rock, and stream samples are only weakly mineralized, with values up to 3.0 ppm silver, and less than 1000 ppm arsenic (Flanigan, 1998). The Honkette gossan consists of a linear zone of millimeter- to centimeter-scale limonite veinlets in dark-gray andalusite hornfels. These veinlets are similar to veinlets in the wall rocks at the Honker prospect (NL018) (Flanigan, 1998). Flanigan (1998) interprets these gossans to be related to magmatic fluids from the Khotol pluton, based on their proximity to the pluton and their low molybdenum content . K-Ar and Ar/Ar dates for the Khotol pluton are approximately 110 Ma (Flanigan, 1998). Also see NL012-014, 016, and 019-022.
  • Age = Flanigan (1998) interprets these gossans to be related to magmatic fluids from the Khotol pluton, based on their proximity to the pluton and their low molybdenum content . K-Ar and Ar/Ar dates for the Khotol pluton are approximately 110 Ma (Flanigan, 1998).

Economic information

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Probably inactive

Mining district

District name Kaiyuh

Comments on the workings information

  • Workings / Exploration = These occurrences were discovered by Anaconda Minerals Company in 1982 (Flanigan, 1998).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF NL016

Bibliographic references

  • Deposit

    Flanigan, B., 1998, Genesis and mineralization of ore deposits in the Illinois Creek region, West Central Alaska: University of Alaska, Fairbanks, M.Sc. thesis, 125 p., 2 plates.

Comments on the references

  • Primary Reference = Flanigan, 1998

General comments

Subject category Comment text
Deposit Model Name = Pb-Zn gossan; pluton-related epigenetic (?)

Reporter information

Type Date Name Affiliation Comment
Reporter 07-AUG-01 Cameron, C.E. Northern Associates Inc.