Mineralization on Zone 1 of the Unuk property occurs near the geologic contact of the Lower Jurassic Betty Creek Formation and the Middle Jurassic Salmon River Formation, both of the Hazelton Group. Salmon River Formation rocks consist primarily of siltstone, greywacke, sandstone, some calcarenite, argillite, conglomerate and minor limestone. Betty Creek Formation rocks may be comprised of volcanic breccia, conglomerate, sandstone, siltstone, tuffs and minor chert and limestone (Grove, Bulletin 63).
Galena and magnetite are reported to occur in outcrop, west of the toe of Jack Glacier, just south of the headwaters of Storie Creek (Newmont Exploration Geology Map). Several hundred metres north of this showing at the tip of the glacier's toe pieces of float containing abundant stringers of pyrite and carbonate were collected. This float assayed 31.5 grams per tonne silver, 0.0157 per cent arsenic, 0.0116 per cent lead and 0.0061 per cent zinc (Assessment Report 15961).
Another area of east trending mineralization occurs about 700 metres to the southwest. Several samples of volcanic rock were taken with one sample identified as dacite and another as rhyolite. These rocks are reported to contain up to 60 per cent sulphides with pyrite being the main sulphide along with lesser chalcopyrite and galena. One sample contained 3.16 grams per tonne gold. Values of silver range from 0.2 to 74.1 grams per tonne (Assessment Report 17087).
Several of the samples collected were float. The company doing the exploration failed to indicate the location of samples containing high gold and silver or if the samples were collected from outcrop or float.
Refer to AP (104B 072) for further details of Zone 1.
Earliest documented exploration in the area now encompassed by the Unuk-Coul claims was by Newmont Exploration in 1960 as part of a broad regional reconnaissance mapping program. Glacier), Unuk Zone 2 () and Unuk Zone 4 (McTagg Several zones were identified as follows: Unuk Zone 1 (Jack Creek) and Gingrass Creek.
The Unuk property claim group were staked in 1986 and 1987 on behalf of Malcolm Bell and Clive Ashworthy. In 1986 the Coul 1-4, and Unuk 1-25 claims were staked followed by the Unuk 26-50 claims in 1987.
Initial work in 1986 involved an airborne VLF-Mag survey commissioned by Hi-Tec Resource Management Limited, followed by a four-day follow-up examination of the property geology by J.P. Sorbara and Associates. In September and October of 1987 Hi Tee Resource Management Limited conducted a two-phase reconnaissance type exploration program (totalling 28 days). Hi-Tec carried out a similar program in 1988 (16 days) to follow up the results of the previous year and to outline other areas of interest on which to focus future exploration efforts. The net result of these preliminary reconnaissance
Both 1987 and 1988 saw reconnaissance programs to relocate and resample existing showings and outline additional localities for potential mineralization in various areas was identified: Zone 1 (AP), Zone 2 (LJ2), R grid, J 1989 and 1990: Six grid, Bedee Zone, and Zone 4 (McTagg Creek).
By 1989, the claims were jointly owned by Cove Energy Corporation (25%) and Springer Resources Ltd. (75%). Both 1987 and 1988 saw reconnaissance programs to relocate and resample existing showings and outline additional localities for potential Mineralization in various areas was identified: Zone 1 (AP) (104B 083), Zone 2 (U2) (104B, R grid, J grid, Beedee Zone, and Zone 4 (McTagg Creek).
In 1989, a field camp was constructed by Granges Inc on the west side of the Unuk River, just upstream from the Coulter Creek junction. The 1989 field work was divided between follow-up of known areas of interest and locating new areas. Detailed work involved establishing control grids with 100 m spaced lines on the 'R' Grid (Coul l), 'J' Grid (Coul 4), Zone 1 (Unuk 14-15) and Zone 2 (Unuk 11 and 12). A total of 1501 soil, 164 silt and 1113 rock samples were collected. VLF-Mag geophysical surveys were conducted on the 'RI Grid and Zone 1 Grid. During the latter part of the 1989 season, five holes totallinq 566.94 m were drilled on the south Zone 1, AP structure, while 3 holes totalling 344.43 m were drilled on the 'R' Grid creek showing.
The 1990 Unuk project exploration program by Granges concentrated on areas of known mineralization which included: (Assessment Report 20390 and 20993): Zone 1 - Unuk 14 and 26; 'R' Grid - Coul 1: and Beedee Zone - Unuk 18 and 19, as well as the development of new targets on the Zone 2/U2 Grid - Unuk 11 and 12. Exploration in the Zone 1 area included mapping, sampling and an IP survey covering property targets selected from the 1989 data. Thirteen drill holes totalling 2678 meters tested these areas. Anomalous gold values up to 7.91 grams per tonne gold across 0.4 meters were intersected in drilling the Cliff Zone. Gold values up to 3.77 grams per tonne gold across 1.0 meters were obtained from the AP structure north along strike from the area drilled in 1989. Mapping and resampling at the Beedee Zone indicated that gold mineralization is located in contact aureoles peripheral to altered mafic dykes. Work on the U2 Grid (Unuk 11 and 12) identified three areas of interest. Bruno's showing which contains gold values to 15.7 grams per tonne from breccia veins is in close proximity to an airborne magnetic/resistivity anomaly. The U2 north area has low gold values associated with arsenopyrite and occurs in a structural setting similar to the Zone l/AP Zone. The Stibnite showing has low gold values associated with arsenopyrite and stibnite mineralization occurring in a structure which is traced along-strike for 150 meters.
In 1991, work by Granges included (Assessment Report 22113): approximately 38.0 kilometers of line was cut, 14.6 km on the 'G' Grid (Coul 1 and 2 claims) and 22.4 km on the Jeff Grid (Coul 3 claim). The results of the geological field program, together with soil sampling and geophysical surveys not reported here, were used to locate preliminary diamond drilling targets. The Tarn Creek (Unuk 11 claim), Jeff Ridge (Coul 3 claim) and 'R' Grid (Coul 1 claim) areas were chosen for preliminary drill testing conducted in September. The Tarn Creek shear zone was tested by a single 114.6 metre hole and anomalous results warrant additional follow-up drill testing. The 'R' Grid Alice Lake showing and the Creek anomaly were tested by five drill holes totalling 310.9 meters. The Mount Dilworth- Salmon River contact was tested in most holes. The only anomalous results were obtained in holes R91-4 and R91-5. The broad zone of alteration and low, but anomalous, gold values required additional work. Six geochemical and geophysical targets on Jeff Ridge were tested during initial drilling. Positive results from the preliminary drilling led to additional drilling in October. Thirty holes, totalling 5380 meters, were drilled on Jeff Grid. Mineralized intervals intersected in drilling indicate that significant gold values occur in eight drill holes (up to 47.14 grams per tonne gold and 348.4 grams per tonne silver across 4 metres in hole J91-7), while an additional ten have anomalous values.
In 2020, Eskay Mining Corp. completed a program of prospecting, rock sampling, ground and airborne geophysical surveys and 4335 metres of diamond drilling in 20 holes on the area as part of the Sib-Corey-North Mitchell property. The geophysical surveys consisted of a 911.7 line-kilometre airborne electromagnetic survey, a 55.85 line-kilometre induced polarization survey and a 43.19 line-kilometre magnetotelluric survey. Drilling was performed on the TV (MINFILE 104B 385) and Jeff (MINFILE 104B 525) occurrences.