The Spark showing is located 1.5 kilometres west of the southern tip of Fourth Lake.

The area is underlain by volcanic and sedimentary rocks of the Devonian Nitinat Formation or possibly the Duck Lake Formation both of the Paleozoic Sicker Group.

The rocks comprise porphyritic hornblende andesite, black andesite, minor rhyolite, conglomerates, greywacke, banded chert and hornblende granodiorite of unknown affinity.

There are two sets of quartz veins in the area. The first set are very tight, closed veins which have been metamorphosed with the surrounding rocks. The veins in the second set, possibly related to the hornblende granodiorite intrusive, are vuggy and often contain pyrite and chalcopyrite.

In 1986, Baseline Resources completed a program of silt sampling and prospecting on the Spark claim.