The Blackpine Lake (Jackpine) pegmatite occurrences are located to the northeast of Blackpine Lake, approximately 75 kilometres north-northwest of the community of Germansen Landing.

The pegmatites are found near the margins of several intrusive bodies which are part of the Wolverine Complex. The Wolverine Complex consists of an assemblage of migmatites, gneisses and schists, with intimately associated granitic rocks and pegmatites of Cretaceous to Tertiary age (Geological Survey of Canada Memoir 274, page 91). The Wolverine rocks are metamorphic equivalents of the Neoproterozoic Ingenika Group, metamorphism occurring in the Jurassic. The largest granodiorite body is located on the mountain immediately northeast of Blackpine Lake, and outcrops over an area of approximately 13 square kilometres (Geological Survey of Canada Memoir 274, page 98). Several smaller bodies of granodiorite have been mapped for an additional 15 kilometres to the north-northeast.

Small bodies of pegmatite are abundant above and around the granodiorite stocks, and swarms of dikes are also found at intervals along the ridges between the granodiorite stocks and Chase Mountain, 25 kilometres north-northeast of Blackpine Lake. The pegmatites are generally in the form of dikes or sills, usually less than 3 metres thick and 150 metres long. In places, the pegmatites form a reticulate network which may occupy nearly 50 per cent of the rock volume over a 1.25 kilometres square area. The pegmatites are of simple composition, and are composed principally of quartz, microcline, microperthite and muscovite and minor sodic plagioclase, biotite, actinolite, garnet, magnetite, sphene, sillimanite and zircon. Muscovite commonly forms euhedral pseudo-hexagonal books as much as 12.5 centimetres in diameter and 7.5 centimetres thick, in some cases forming pockets in the dikes up to 3 metres across, composed of 50 per cent muscovite. Numerous quartz veins are associated with the pegmatites.

In addition to the pegmatites, cream coloured, coarse-grained, graphic granite occurs in irregular bodies up to 30 metres in diameter in the gneiss-migmatite roof rocks above the granodiorite body, northeast of Blackpine Lake. Feldspar (probably microperthite) in the graphic granite constitutes up to 70 per cent of the bodies (Geological Survey of Canada Memoir 274, page 101), the remainder of the rock being quartz (25 per cent) and twinned sodic plagioclase (5 per cent).