The Mack occurrence is located on the east slopes of Snow Peak, about 22 kilometres west of the community of Dease Lake.
The showing is in an area underlain by a belt of Lower Jurassic metasedimentary rocks of the Takwahoni Formation (Laberge Group) cut by abundant sills and dikes of feldspar porphyry. The Late Cretaceous Snow Peak pluton composed of granodiorite and quartz monzonite, intrudes the metasediments immediately north and east of Snow Peak.
Molybdenite, pyrite and trace chalcopyrite occur within a slightly porphyritic granodiorite body in an elongate zone trending for about 914 metres in an east-southeasterly direction from the south wall of a cirque, southeast of a tarn on the east side of Snow Peak. The sulphide minerals either occur in hairline fractures, 0.6 centimetre quartz seams or as disseminations. Spacing on the molybdenite and/or pyrite quartz stringers ranges from about 15 to 61 centimetres.
The fractures dip steeply north and strike from 295 to 305 degrees. Some jarosite, ferrimolybdite, scheelite and/or powellite have also been observed.
Samples from a trench and pits yielded up to 0.13 per cent molybdenum, 0.39 per cent WO3 (or 0.3 per cent tungsten) and 1.6 grams per tonne gold (Assessment Report 7657, page 10).
In 1966, the showings were discovered and staked by a local prospector, M.A. Nehase, but the claims were allowed to lapse the following year. In 1969, the Mack 1-28 claims were staked on the showings by Tournigan Mining Explorations Ltd. The Patino Mining Corporation examined the claims early in 1970 and collected 50 soil samples; assays for molybdenum ranged from 40 to 4000 parts per million. In 1971, soil sampling on the Mark 1-14 claims was carried out by Tournigan over 11 line kilometres and a geological mapping survey completed over the 28 claims. In 1972, Tormex Resources Ltd., a subsidiary of Tournigan Mining, carried out geological mapping, a magnetometer survey over 45 line kilometres, and a geochemical soil survey over 30 line kilometres. During the 1975-1976 assessment years, some road construction and trenching were carried out. During the summer of 1979, the existing trench from 1976 was extended to the east, and two pits were dug to test the IP anomalies. In 1979, Tormex conducted an IP survey over an area of approximately 750 by 900 metres – a total of five lines.
In 2011, Geoscience BC’s QUEST-NW initiative covered the Mack project area with bedrock mapping and airborne geophysical surveys.
In 2016, United Mineral Services Ltd. (UMS) acquired the Mack Property by staking the Mack claim which covers the strong copper-molybdenum- tungsten geochemical anomaly, the gold bearing trenches and pits in bedrock, and also the coincident IP chargeability anomaly.
In 2017, United Mineral Services completed a geophysical review on historical data over the Mack Property. The review utilized several historical datasets, which were digitized, processed and subsequently inverted. Results of the geophysical modelling revealed a donut like magnetic body, containing lower susceptibility values within the magnetic outer ring. A deep penetrating IP survey over this potentially altered and mineralized magnetic low was recommended (Assessment Report 37279).
In 2018, a geochemical soil sampling program was performed on the Mack mineral claim (Title 1048104) resulting in the collection of 386 soil samples. The survey revealed large areas of highly anomalous copper, molybdenum and tungsten values in soil, that coincide with historical IP chargeability anomalies, gold-bearing bedrock samples from trenches and pits. Mineral claims Mack 2 (Title 1063734) and Mack 3 (Title 1063733) were staked by United Mineral Services to cover the anomalous results and the full known extent of the prospective intrusion (Assessment Report 38367).
In 2020, United Mineral Services Ltd. drilled 583 metres in 3 diamond drill holes.
