The MacLellan Property is located within the Churchill Structural Province of the Canadian Shield, lying within the northern portion of the Lynn Lake greenstone belt and underlain by metamorphosed, Wasekwan Group supracrustal rocks (Figure 6-1). The Wasekwan Group volcanic and sedimentary rocks have been intruded by small subvolcanic plutons and subsequently folded, faulted and intruded by larger mafic and felsic plutons. Sedimentary rocks belonging to the Sickle Group unconformably overlie the Wasekwan Group and the early intrusions. Along the margin of the greenstone belt, there is evidence of post-Sickle deformation and plutonism.
The Lynn Lake greenstone belt, comprised of a North and older South belts, is part of a larger litho-structural unit which extends in a northeasterly direction from the La Ronge greenstone belt in Saskatchewan.
The North belt is a north-facing homocline and consists of rhyolite, overlain by andesite and basalt, sedimentary rocks and an upper basaltic unit. The upper basalts include high alumina and subordinate high magnesia tholeiites. Both the MacLellan deposit (Au, Ag) and the Farley Lake deposit (Au) are located within this belt, which has been termed the 'Rainbow Trend' (Figure 6- 2). The rocks in the South belt consist of lens-shaped volcanic and sedimentary units which have been interpreted as overlapping edifices with flanking aprons of volcaniclastic rocks (Gilbert et al. 1980) and is termed the 'Johnson Trend'. The former Burnt Timber open pit deposit (Au) is contained within this belt.
Structurally, the most significant feature in the South belt is the east-west trending Johnson Shear Zone ("JSZ"), a wide zone of intense brittle-ductile deformation, characterized by faulting, shearing, mylonitization and associated silica and carbonate alteration and sporadic gold mineralization. The JSZ is host to at least 26 gold prospects and showings over a 44 km strike length.
