The Wellington (Mascot, Eclipse) showings are not reliably located beyond the fact that they are near the headwaters of Hellroaring Creek, at an elevation of about 1800 metres. This may explain why they do not appear to have received recent attention during the exploration in the adjacent Perry Creek drainage; they could not be relocated.
A single vein of great strike extent is hosted by the Creston Formation of the Middle Proterozoic Purcell Supergroup, comprising argillaceous quartzites in this location, metamorphosed to greenschist facies. A porphyritic granite crops out about 60 metres below the vein, and is characterized as a stock. Recent mention of this stock (Assessment Report 16656) suggests it may be Cretaceous in age, and possibly related to the mineralization.
The vein is sharply defined, apparently following a strong fault- fissure zone conforming more or less with the schistosity of the enclosing quartzites rather than with their bedding; however, the two sources (Minister of Mines Annual Reports for 1915 and 1932) differ in the strike by 30 degrees, one suggesting the strike is due north and the other that it is 030 degrees, dipping 65 to 80 degrees east. The vein is mainly quartz with galena, pyrite, sphalerite and minor chalcopyrite; no alteration envelope is described. Values in gold and silver are apparently confined to a pay streak which favours the hangingwall side of the vein. The vein may be traced over a length of 600 metres, with assays over widths up to 1.0 metre of up to 14.4 grams per tonne gold, 140 grams per tonne silver, 15 per cent lead, and 0.8 per cent copper (Minister of Mines Annual Report 1932, page 162).