The Sibola Mountain property is underlain predominantly by massive, fragmental and tuffaceous andesites, andesite porphyry, minor porphyritic dacite and welded rhyolite tuff of the Lower Jurassic Telkwa Formation (Hazelton Group). Hornblende biotite granodiorite of the Late Cretaceous Bulkley Intrusions is exposed in the northern portion of the property and locally, the andesitic units are altered to biotite hornfels. Late post-mineralization aplite dikes intrude all of the units.
Two parallel, northwest striking and near vertical dipping mineralized zones are hosted in andesite and exposed by trenches near the centre of the property. The mineralized zones are 259 metres apart and are called the Sibola West and Sibola East zones.
The Sibola East zone (formerly the West View) is characterized by pyrite-sphalerite mineralization present as stockwork stringers and thin lenses accompanied by sulphide-rich quartz stringers and veins. Minor amounts of chalcopyrite, molybdenite and galena are also evident. The wallrock andesite is silicified and sericitized. Resampling of the discovery trench yielded 6.5 grams per tonne gold, 49.3 grams per tonne silver and 10.1 per cent zinc over 0.9 metre. Nine drillholes delineated the Sibola East zone over a strike length of approximately 61 metres to a vertical depth of 47 metres. The drilling yielded erratic but strongly anomalous to significant gold, silver and zinc values over narrow widths; the deepest hole assayed 11.4 grams per tonne gold, 70.9 grams per tonne silver and 3.37 per cent zinc over 2.29 metres of core length. The zone is open along strike to the southeast and to depth (Assessment Report 18907).
The Sibola West zone consists of diffuse phyllic alteration with several per cent disseminated pyrite enveloping a massive pyrite-pyrrhotite lens exposed in a trench. The highest gold value obtained was 2.0 grams per tonne.
A bulk sample from a surface trench from the Sibola East zone containing massive sphalerite and pyrite with minor chalcopyrite was sent for metallurgical testing. Head assays reveal that the ore contains considerable gold and silver values in addition to zinc, minor copper and lead (Assessment Report 23112).