The D1 occurrence is located about 64 kilometres southeast of the community of Dease Lake.
The area is underlain by Upper Triassic to Lower Jurassic green and purplish red volcanic and volcaniclastic rock of andesitic composition. These are interstratified with lithic sandstone and conglomerate and overlain by a black argillite unit, possibly of the Lower Jurassic Takwahoni Formation (Laberge Group). The strata dips gently to the east (5 to 30 degrees).
The Discovery showing was found in 1981 and consists of a mineralized quartz-calcite vein, up to 30 centimetres wide, containing sulphides and precious metals. The vein is mineralized with semimassive galena and sphalerite along with disseminated blebby pyrite, chalcopyrite, bornite, malachite and arsenopyrite. Native gold, electrum, freibergite and hessite were recognized under a reflecting optical microscope. Weak limonitic alteration occurs in and adjacent to the vein.
The vein strikes 030 degrees with a vertical dip and is hosted by andesitic tuffs. The vein has been traced, through prospecting and trenching, for 30 metres. The overburden-covered lineament in which the vein occurs can be traced for 300 metres.
In 1981, channel samples assayed 1110.87 grams per tonne silver and 161.32 grams per tonne gold across 10 centimetres, and 589.72 grams per tonne silver and 115.89 grams per tonne across 25 centimetres (Assessment Report 14004).
In 2014, eleven mineralized rock samples were collected from the Discovery vein. Highest result was from sample D1-A-189-14 which assayed 43.1 grams per tonne gold, 1.8 per cent lead, 1.98 per cent zinc and 240 grams per tonne silver (Assessment Report 35096).
Between 1981 and 1987, the D claims were worked by Pamicon Resources in conjunction with Orsina Resources and/or Balance Resources. Work included geochemical programs, geological surveys and trenching. Northair Mines Ltd. held the property as the McBride claim in 1990 and collected 34 rock samples.
In 2014, rock sampling and geological investigations were completed on behalf of D. Javorsky Prospecting Inc.
See related occurrences D4 (104I 100) located 1.8 kilometres northeast, and D8 (104I 101) located 325 metres east.
