This prospect lies 900 metres north-northeast of the northern end of the North Lens of the Ecstall deposit (103H 011). The showing was discovered during the exploration program of 1919 (MacDonald, 1920, p.3) by searching for the source rocks of an iron-oxide cemented talus pile (ferricrete) that had come to rest in Red Gulch Creek. The prospect crops out 60 metres east and uphill of Red Gulch Creek, where it is exposed in a minor west-draining creek gully. A lens of massive pyrite, 30 metres long and 1.5 to 2.0 metres thick, is hosted in pyritic quartz-sericite schist (Hassard et al., 1987b, p. 24-26 and Figure 6). A 1952 drill program completed 13 short holes with an x-ray drill. The best intersection was 5.2 metres (17 feet) grading 0.63 per cent copper and 2.3 per cent zinc in hole XR5 (Property File). This included a 5-foot intersection grading 3.7 per cent zinc and a 6-foot intersection grading 1.1 per cent copper. The drill results should be reassessed in light of the new structural interpretations for the geometry of the Ecstall (103H 011) and Packsack (103H 013) massive sulphide deposits, to determine if the initial drillholes were optimally located. The sulphide lens likely plunges at either -70º to the south or -60º to the north.

The immediate hangingwall (east side) rock is a 30-centimetre-thick chert unit. The northward continuation of this zone crops out 150 metres to the north-northwest in Red Gulch Creek as a 10-centimetre-wide band of massive pyrite. The host pyritic quartz-sericite schist unit has been traced for another 1.4 kilometres to the north-northwest where it crops out along the crest of Red Gulch Ridge. This prospect has not been examined in the field.

A new structural interpretation for the area around the Ecstall (103H 011) massive sulphide deposits predicts that the Third Outcrop prospect could be the folded repetition of the Red Bluff (103H 088) showing which crops out to the west and south of the Ecstall South Lens (103H 011).