The Master Ace occurrence is located on steep, south-facing, high mountain slopes in the northern head waters of Eighteen Mile Creek, approximately 3 kilometres west-northwest of Ghostpass Lake. Former trenches are exposed over elevations from 1710 metres to almost 2100 metres.

The area is underlain by Permian to Jurassic Hozameen Complex rocks composed mainly of interbedded chert, pelite, basic volcanics and minor limestone. These are intruded by a Late Cretaceous or older quartz diorite intrusion. To the northeast of the showing, the Hozameen fault traverses south-southeast and separates the low greenschist facies rocks of the Hozameen Complex from unmetamorphosed Mesozoic rocks. Ultramafic rocks are cut by greenstones of the Hozameen Complex and generally occur along the fault. There is shearing along this contact and in places the ultramafic rocks appear to be intrusive. The ultramafic rocks that occur along the Hozameen fault are part of the Coquihalla Serpentine Belt.

The occurrence is underlain by altered Hozameen Complex greenstone and volcanic chert with argillaceous chert and mylonite. A major fault/shear structure trending 350 to 360 degrees with an apparent dip of 75 to 80 degrees west, traverses the property. The fault/shear is represented by a serpentinized ultramafic, which is up to 100 metres wide in places. The western contact of the serpentinite is comprised of a strong talc shear in fault contact with sheared, siliceous argillaceous chert. The eastern contact is comprised of an irregular serpentinite, cherty volcanic-greenstone contact. Both east and west contacts are associated with quartz veining.

Several old trenches and open cuts are found along the west contact, which follows a talc shear zone. Mineralization is hosted in sub-parallel quartz veins and stringers that are associated with the talcose schist. Sheared quartz veins consistently carry chalcopyrite with malachite-azurite staining and lesser arsenopyrite. In 1933, the quartz veining was found to host pyrite, chalcopyrite and arsenopyrite. The vein averaged 0.6 to 1.8 metres in width and is traceable for several kilometres. Samples were reported to have assayed 8.9 grams per tonne gold and 189.5 grams per tonne silver.

Surface sampling of the Master Ace zone, which has been outlined for 762 metres, yielded anomalous gold, silver, copper and arsenic with detectable nickel, chromium and bismuth. In the late 1940s, a mining consultant reported "ribboned" or "banded" arsenopyrite in the quartz as well as sperrylite, an arsenide of platinum. Detectable platinum associated with the nickel and chromium was reported in 1986

In 1985, sampling of the old workings yielded 3.2 grams per tonne gold, 22.1 grams per tonne silver and 1.345 per cent copper (Assessment Report 15086).

The 1986 drilling in the quartz-altered talc schist shear intersected magnetite, chalcopyrite, pyrrhotite and arsenopyrite with lesser pyrite associated with quartz. Two samples from the percussion drilling averaged 9.33 grams per tonne gold and 13.71 grams per tonne silver (Assessment Report 16342).

In 1986, rock samples yielded values of up to 3.20 grams per tonne gold, 22.0 grams per tonne silver and 1.345 per cent copper, while a chip sample, across 4.5 metres, yielded 3.74 grams per tonne gold and 14.4 grams per tonne silver (Assessment Report 16342).

Also at this time, quartz float or sub-crop samples, taken 450 metres to the south, yielded from 3.2 to 11.0 grams per tonne gold with 3.1 to 16.2 grams per tonne silver,; while percussions drilling at this location yielded 12.1 grams per tonne gold with 18.4 grams per tonne silver over 2.4 metres and 4.8 grams per tonne gold with 6.6 grams per tonne silver over 2.7 metres (Assessment Report 16342).

In 1987, diamond drilling yielded up to 0.37 gram per tonne gold, 2.5 grams per tonne silver and 0.11 per cent copper over 1.5 metres (Assessment Report 16730).

The area was originally explored in the 1920’s and 1930’s and a number of trenches were completed. During 1985 through 1987, programs of prospecting, rock and soil sampling, geological mapping, a 10.0 line-kilometre ground electromagnetic survey, thirty shallow percussion drill holes and seven diamond drill holes, totalling 277.9 metres, were completed on the area as the Master Ace I-II claims. In 2007 and 2008, the area was prospected by D. Chamberlain. In 2009, the area was prospected by D. Cardinal.

During 2011 through 2014, minor programs of reconnaissance geological mapping, prospecting and trenching were performed on the area as the Master Ace property. Most of this work was centred on the Timberline (MINFILE 092HSW146) occurrence to the north.