A disseminated sulphide bearing horizon crops out high above Montgomery Lake on the east-trending divide between Goldstream River and Downie Creek.

The sulphide horizon is hosted by rusty wearthering thinly foliated actinolite schist and siliceous schist/metachert which form the hangingwall of a metadiorite sill 1 to 3 metres thick. The horizon can be traced for approximately 500 metres in a sequence of interlayered graphitic pelite, marble and micaceous quartzite which is coarsening upward. The sequence above the sulphide horizon consists of clean quartzite, mica schist and marble. The latter hosts the lead-zinc mineralization of the KJ showing.

The Upper Montgomery sulphide horizon has a prominent electromagnetic signature. It was sampled near its eastern and western ends and analyses returned low base and precious metal values, but elevated manganese.

Diamond drilling in 1994 tested the eastern end of this zone. Drillhole 94-2 interesected two semimassive pyrrhotite zones separated by 26 metres of interlayered greenstone, dark graphitic pelite and carbonate units. The upper (3.8 metres) and the lower (3.2 metres) zones returned trace to insignificant copper values. Drillhole 94-3, collared 100 metres north-northwest of 94-2, intersected only the upper sulphide zone. Analysed samples returned trace amounts of copper (Fieldwork 1994, page 235).