The Ace showing is 1.15 kilometres northeast of the summit of Grasshopper Mountain, 9 kilometres west-northwest of the town of Tulameen.
The area on the east flank of Grasshopper Mountain is underlain by various metasediments and metavolcanics of the Upper Triassic Nicola Group. These rocks strike north to northwest and dip steeply west. The showing lies 150 to 200 metres northeast of the contact with hornblende clinopyroxenite of the Early Jurassic Tulameen Ultramafic Complex.
Five subparallel and steeply west dipping quartz veins striking 145 to 160 degrees, parallel to the pyroxenite contact, are exposed over an interval of 60 metres. Individual veins are 0.20 to 1.37 metres wide. The veins are hosted in schistose metasediments accompanied by considerable serpentine and calcareous rocks. The wallrocks are predominantly serpentinite.
The veins are comprised of vitreous quartz containing a large amount of rusty weathering carbonate (siderite (?)) and local pockets of talc. Mineralization is sparse and consists mainly of pyrite and chalcopyrite. Rare hematite, petzite (silver-bearing telluride) and native gold are also present. Some pyrite, pyrrhotite and chalcopyrite are locally present in the wallrocks.
The No. 4 vein is the most developed of the five veins. It has been traced along strike for 40 metres and is 0.41 to 1.37 metres wide along one section of stripping, 14 metres long. The vein pinches out to the north and fades into a 1.2-metre wide zone of alteration to the south. Petzite and native gold occur as stringers in the vein near the centre of the area of stripping. Six samples of typical vein material, including four from the No. 4 vein, analysed trace gold (Property File - M.S. Hedley, 1937, page 4). No attempt was made to include material containing petzite or native gold during this sampling. Four samples of malachite-stained quartz yielded insignificant platinum, gold and copper values (Assessment Report 7944, page 4).
The showing was first explored during the late 1930s by the Hamilton brothers. Some prospecting was conducted in 1979.
