The Jewel Lake area is underlain by a complex of metamorphic rocks mostly of sedimentary and volcanic origin correlative with the Carboniferous or older Anarchist Group, and a large granodiorite intrusion correlative to the Juro-Cretaceous Nelson Plutonic Rocks. Small dykes and sill-like bodies, feeders to nearby Tertiary lavas, pervade these units.
Locally the metamorphosed volcanic and sedimentary rocks are not always distinguishable, both being fine-grained and medium or dark coloured with primary structures such as bedding and flow banding being confused with foliation or gneissosity. Generally the sedi- mentary rocks are brittle and quartz-rich, however, compositions vary and some biotitic varieties have the same competence as the amphibole- rich volcanic rocks. These rocks are locally called quartzites but few are true quartzites and more appropriate terms would be quartz wacke or lithic wacke. The massive character of the volcanic rocks is due to a combination of intense regional metamorphism and primary structures. Field and petrographic data indicate that at least some of the original rock formed as a result of massive accumulations of lava flows and pillow lava. Crosscutting feeder dykes and sills are significant and contribute to the massive aspect of the volcanic rocks. The metamorphosed schistose volcanic rocks are compositionally basalts. These metasedimentary and metavolcanic rocks form part of the Carboniferous (Pennsylvanian-Mississippian) or older Anarchist Group.
Igneous intrusions in the Jewel Lake camp include a large Lower Cretaceous granodiorite pluton and a host of younger pulaskite and lamprophyre dykes. The granodiorite is correlative with Nelson Plutonic Rocks. It is a homogeneous medium-grained grey body which intrudes the metavolcanic rocks along a northwest trending contact in the southwest part of the camp. The intrusive has produced little effect in both the metavolcanic and metasedimentary rocks. Grano- diorite dykes occur and are compositionally similar to the main grano- diorite body and are probably offshoots from it. Pulaskite dykes are numerically most important. Several types are evident including both quartz-bearing and undersaturated types. Post-vein lamprophyre dykes as well as the pulaskite dykes are of probable Lower Tertiary age and cut all other major geological units.
On the Amandy claim (L.2795), north striking fractured and sheared metasedimentary rocks of the Carboniferous (Pennsylvanina- Mississippian) or older Anarchist Group dip 30 to 60 degrees east. The rocks are schistose quartz wackes or lithic wackes and are intruded by a swarm of Lower Tertiary pulaskite dykes and Lower Cretaceous granodiorite dykes.
Quartz fissure-veins have a tendency to occur in fracture zones that roughly parallel the bedding/foliation planes of the metasedi- mentary rocks. The quartz vein in the dominant fracture zone is alternately banded with host rock. Mineralization consists of pyrite which is oxidized near surface, galena, sphalerite and tellurides (possibly sylvanite). The vein width ranges from a few centimetres to 3 metres, and extends for short distances along strike and down- dip. This vein swings northeast along bedding/foliation planes in the northern part of the claim. In less prominent fracture zones east and northeast of the main fracture zone, quartz veins also occur with similar mineralization and widths ranging from 1 to 45 centi- metres.
The North Star occurrence was first discovered in 1895 to 1907.
In 1947, Quatsino Copper-Gold Mines Ltd. completed an exploration program on the occurrence. Diamond drilling explored the extent of the Amandy vein.
In 1969, a geological and airphoto interpretation was completed on the Amandy area.
In 1983, Bay Ann Resources conducted a soil sampling program. No significant results were reported.
In 1981 to 1986, Kenar Resources Ltd. conducted an exploration program including the occurrence. Exploration included a small drilling program, and a soil geochemical survey over the areas of Gold Drop, North Star, and Lake View.
