Three alkaline stocks, spaced at about 13 kilometre intervals, occur along a northeast trend. The Parrott Lake intrusion, located at the west end of the intrusive belt, is poorly exposed, but, the large stock to the east (093L 263) is described in detail. The Parrott Lake intrusive was dated at 49.4, plus or minus, 1.5 million years (Energy, Mines and Petroleum Resources, Preliminary Map 11).
South of Parrott Lake, the Goosly Lake stock intrudes Francois Lake Group, Eocene Goosly Lake Formation volcanics comprised mainly of feldspathic andesite and trachyandesite lavas with breccias and sills (Bulletin 78, Figure 1).
The alkaline intrusive ranges from gabbro to syenomonzonite consisting of 65 to 80 per cent plagioclase, 5 to 20 per cent augite, accessory biotite, apatite and magnetite. Interstitial feldspar and traces of quartz are found in more acidic varieties. The gabbroic phases are enriched in pyroxene and contain calcite and chlorite pseudomorphs after olivine with accessory feldspathoid minerals.
Several significant mineral occurrences are associated with the alkaline rocks of the Goosly Lake area. Approximately 9.0 kilometres to the southwest of the Parrott Lake intrusion, showings at the Silver Queen Mine (093L 002), thought to be related to the alkaline dikes, host fissure veins of pyrite-sphalerite with galena and local concentrations of chalcopyrite with some tennanite.
In 1970, an analysis of the syenomonzonite at the south end of Upper Parrott Lake showed trace ilmenite with 1.4 per cent nepheline (Geology, Exploration and Mining in British Columbia 1970, page 124). A geophysical survey by Canadian Superior Exploration Limited identified a series of strong magnetic responses in the area. The magnetic responses are sub-parallel and trend 110°.