Find publications, data and maps managed by the
Yukon Geological Survey

Occurrence Details


Occurrence Number
115I 167
Occurrence Name
1935 Shaft Zone
Occurrence Type
Hard-rock
Status
Showing


General Information

Secondary Commodities: gold, silver
Aliases: Freegold
Deposit Type(s): Epithermal Au-Ag: Low Sulphidation
Location(s): 62.290990 N, -137.1201 W
NTS Mapsheet(s): 115I06
Location Comments: Coordinates provided by Triumph Gold in 2020.
Hand Samples Available at YGS: No

Capsule

Work History

The original discovery in the Mt. Freegold area was made by P.F. Guder in 1930 on the Augusta cl (15494), followed by discoveries on the adjoining Peerless, Gold Star and Margarete claims. Guder explored with shallow shafts in 1935. Guder's claims (Gold Star group) were optioned in 1969 to Yukon Revenue Mines Ltd. In 1973, Prism Resources Ltd. optioned the claims.

Prism transferred the option early in 1974 to Dynasty Exploration Ltd. Guder's claims were optioned by Arctic Red Resources Corporation from 1980 to 1982, then transferred to Guder Mining Exploration Ltd. The Guder and Harris claims were optioned in 1986 by Chevron Minerals Ltd., which conducted a grid geochemical survey and bedrock mapping. The claims were optioned again in 1987 by Big Creek Joint Venture (Big Creek Resources Ltd and Rexford Minerals Ltd). The claims were transferred back to Harris in September 1989.

Gagan Gold Corporation optioned the property in 1991. Redell Mining Corporation optioned the Goldstar property from Harris and Associates in August 1994. In September 1995, Pauline cl (YB37987) and Goldstar cl 1-3 (YB37988) were transferred to B. Harris.

In 2004, Midnight Mines Ltd. carried out prospecting, rock geochemistry of grab samples and bedrock mapping around the 1935 Shaft.

Northern Freegold Resources consolidated the claims in 2006 as part of their Golden Revenue property and performed a property wide VTEM and magnetic airborne survey, including the 1935 Shaft. Northern Freegold performed soil sampling near the 1935 Shaft in 2007 and further soil and rock geochemistry, as well as trenching in 2013.

Triumph Gold acquired Northern Freegold Resources in 2015 and the property that includes the 1935 Shaft occurrence is now termed the Freegold Mountain Project.

Regional & Property Geology

The occurrence is partly underlain by Yukon-Tanana Terrane (YTT). The rocks of the YTT in this region consist of Early Mississippian metamorphic rocks separated into meta-sedimentary and meta-igneous suites. The meta-sedimentary suite consists of micaceous quartz-feldspar gneiss, schist and quartzite. The meta-igneous package is comprised of biotite-hornblende feldspar gneiss and coarse-grained granodiorite orthogneiss with lesser amphibolite.

The YTT basement rocks are cut by numerous plutonic and volcanic events from the Mesozoic (Murray & Friend, 2018), including:
1. Early Jurassic Long Lake monzonite to syenite plutonic suites;
2. Mid-Cretaceous Mount Nansen Suite andesite to diorite;
3. Mid-Cretaceous Whitehorse granodiorite, quartz monzonite and granite;
4. Late Cretaceous Casino quartz monzonite;
5. Late Cretaceous Prospector Mountain syenite; and,
6. Quartz feldspar and feldspar hornblende porphyry dykes and plugs.

The major structural feature in the area is the Big Creek Fault with steeply-dipping, northwest-trending dextral faults parallel to the more regional Tintina and Denali faults (AR 097175).

Mineralization & Results

A distinct gossan is evident at two shafts from 1935 (1935 Shaft Zone). The west shaft shows a quartz vein containing pyrite with some limonite and copper staining 12 to 16 inches wide striking 280 degrees and dipping very steeply south. The wall rock is an altered granitic rock. A small fault fracture along the vein contains gouge from which gold is said to have been panned. Fifty feet to the south of the west shaft is a parallel vein of blue- grey, fine-grained quartz and pyrite. The east shaft is approximately 300 yards east of the west shaft. It is said to show a vein 7 feet 10 inches wide, striking approximately east. The vein matter on the dump is blue-grey quartz with pyrite (Paulter, 2006).

Sampling from one of the dumps at the 1935 Shaft Zone returned assays of 26.3 g/t Au from epithermal-style vein material. Mineralization consists of quartz veining with coxcomb textures and fine pyrite and sericite alteration of the matrix (AR 094709).

In 2013, a grab sample obtained from a boulder of vuggy quartz vein returned 914 ppb Au, 128 ppm Ag, 4300 ppm Cu, 2970 ppm Pb, 40 ppm Bi, and 2330 ppm Sb. Soil samples in 2013 delineated a 20-50 metre wide by 200 metre long zone of coincident anomalous gold, silver, bismuth, and copper. This zone parallels the inferred strike extension of the mineralized vein system observed in the 1935 shaft workings, as well as the magnetic lineament and the contact between the granodiorite and megacrystic syenite (AR 096643).

Location Map

Last Updated: Dec 24, 2020

Work History

Year Work Type Comment
2013 Geochemistry: Rock
2013 Geochemistry: Soil
2013 Trenching: Mechanical
2007 Geochemistry: Soil
2006 Airborne Geophysics: Magnetic Property wide survey.
2006 Airborne Geophysics: VTEM Property wide survey.
2004 Geochemistry: Rock Grab samples during prospecting.
2004 Geology: Bedrock Mapping
1986 Geochemistry: Soil
1986 Geology: Bedrock Mapping
1935 Development, Underground: Shaft Development

Regional Geology - Terrane

Group:
Affinity:
Name:
Realm:


Regional Geology - Bedrock

Supergroup:
Group/Suite:
Formation:
Member:
Terrane:
Period Max:
Age Max: MA
Period Min:
Age Min: MA
Rock Major:
Rock Minor:
Reference:
Geological Unit (1M):
Geological Unit (250K):

Related References

Number Title Page(s) Document Type
091896 Report on Geological Mapping and Geochemical and Geophysical Surveys Done on the Goldstar Property Assessment Report
097175 Drilling and Geochemical Report on the Freegold Mountain Project Assessment Report
YEG2017_4 New contributions to the bedrock geology of the Mount Freegold district, Dawson Range, Yukon (NTS 115I/2, 6 and 7) Annual Report Paper
2018-2 Bedrock geological map of the Mount Freegold district, Dawson Range Open File (Geological - Bedrock)
094745 2006 Geophysical Assessment Report on the Freegold Mountain Property Assessment Report
096643 2013 Geological and Geochemical Report for the Freegold Mountain Property Assessment Report
094709 2004 and 2005 Assessment Report on the Goldstar and Glen Property Assessment Report
093189 Exploration Report on the Freegold Mountain Project Freegold Mountain Area Assessment Report
Citations
Paulter, J. (2006). Evaluation Report on the Freegold Project for Northern Freegold Resources. Available on SEDAR.

Submit Information to Yukon Geological Survey

Name:

E-mail:

Comment: