Huron

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Ag; Cu; Hg; Mo; Pb; Sb; U; W; Zn
Ore minerals arsenopyrite; gold; pyrrhotite
Gangue minerals quartz; sericite

Geographic location

Quadrangle map, 1:250,000-scale LG
Quadrangle map, 1:63,360-scale B-5
Latitude 65.425
Longitude -149.48
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Huron prospect is located on a northeast-trending ridge of the Sawtooth Mountains between Huron Creek and Mud Fork, 2.8 miles north-northeast from the peak VAMB 4494 'Tooth'; NW1/4NE1/4 and 0.4 mile north-northeast from the center of section 19, T. 7 N., R. 9 W., of the Fairbanks Meridian. The Huron Prospect location is accurate within 300 meters.

Geologic setting

Geologic description

The Huron Prospect is the northeastern most prospect on a gold mineralized trend known at the Tooth Trend (J.R. Woodman, Senior Natural Resource Manager, Doyon Limited, written communication, 2014). The Huron prospect, Peak prospect, and Saddle occurrence are located on the Tooth trend, which coincides with projection of a southwest-northeast trending thrust fault contact, in Devonian sedimentary rocks (Wilson and others, 1998).
Huron gold mineralization is associated with (a) narrow quartz-sulfide veins within quartz monozonite sills and in sedimentary rocks adjacent to the sills; (b) semi-massive pyrrhotite-rich sulfide plus silica replacement bodies in calcareous sedimentary rocks adjacent to the sills. Quartz-sulfide veins contain up to 15 percent arsenopyrite and assays up to 1.4 grams of gold per tonne for a 5 foot interval (sample HC9603, 25 to 30 feet) with sericitic alteration selvages hosted in two quartz monzonite/granite dikes and adjacent sedimentary rock (ASA -Montague, 1997).
Sixty-one soil samples were collected on and near two quartz monozonite sills by ASA-Montague in 1994. Nineteen of the soil samples yielded assays of greater than 0.5 part per million (ppm) gold, with the highest containing 1.57 ppm gold (ASA-Montague, 1994a, 1994b). In 1996 and 1997, eleven core holes totaling 2,368 feet were drilled in sedimentary hornfels adjacent to the sills. A total of 10 drill intercepts ranging from 0.1 foot to 5.0 feet thick yielded assays of greater than 1.0 ppm gold (ASA-Montague,1997).
Geologic map unit (, )
Mineral deposit model Intrusive-related gold.
Age of mineralization Cretaceous or later based on age of the quartz monzonite (Wilson and others, 1998).
Alteration of deposit One type of alteration associated with gold mineralization is semi-massive pyrrhotite-rich sulfide plus silica replacement bodies in calcareous sedimentary rocks adjacent to the sills. Another type of alteration also associated with gold mineralization is sericitic alteration in which sericitic selvages are hosted in two quartz monzonite/granite dikes and adjacent sedimentary rock (ASA -Montague, 1997).

Production and reserves

Workings or exploration
Sixty-one soil samples were collected on and near two quartz monozonite sills by ASA-Montague in 1994. Nineteen of the soil samples yielded assays of greater than 0.5 part per million (ppm) gold, with the highest containing 1.57 ppm gold (ASA-Montague, 1994a, 1994b). In 1996 and 1997, eleven core holes totaling 2,368 feet were drilled in sedimentary hornfels adjacent to the sills. A total of 10 drill intercepts ranging from 0.1 foot to 5.0 feet thick yielded assays of greater than 1.0 ppm gold (ASA-Montague, 1997).
Huron gold mineralization is associated with a) narrow quartz-sulfide veins within quartz monozonite sills and in sedimentary rocks adjacent to the sills; b) semi-massive pyrrhotite-rich sulfide plus silica replacement bodies in calcareous sedimentary rocks adjacent to the sills. Quartz-sulfide veins contain up to 15 percent arsenopyrite and assays up to 1.4 grams of gold per tonne for a 5 foot interval (sample HC9603, 25 to 30 feet) with sericitic alteration selvages hosted in two quartz monzonite/granite dikes and adjacent sedimentary rock (ASA -Montague, 1997).
Indication of production None
Reserve estimates None.
Production notes None.

Additional comments

Suggestions to add this record and references were provided as a written communication by J.R. Woodman, Senior Natural Resource Manager, Doyon Limited, 2014.

References

References

ASA-Montague, 1994a, Annual Report Reconnaissance Program Doyon Option Lands, Volume 1 (Doyon Report 95-14a, Report held by Doyon, Limited, Fairbanks, Alaska).
ASA-Montague, 1994b, Annual Report Reconnaissance Program Doyon Option Lands, Volume 3 (Doyon Report 95-14c Report held by Doyon, Limited, Fairbanks, Alaska).
ASA-Montague, 1997, Annual Report for Doyon Option Lands Volume 1 (Doyon Report 98-7a, Report held by Doyon, Limited, Fairbanks, Alaska).
Reporters V.C.Zinno (Alaska Earth Sciences, Inc.)
Last report date 12/24/2014