The Hen property is underlain by the Nicola Group, Upper Triassic in age, that consists here of predominantly volcanic and calcareous sandstone of the Nicola volcaniclastic succession, and coarser volcanic breccia and mafic flow units occur to the north of the Hen-Dyke and Ledge prospects, and to the west at the Anomaly Creek prospect. At the Anomaly Creek zone, these volcanic rocks occur in north trending contact with the Boss Creek units of the Takomkane batholith. Schiarizza and Macauley, (Fieldwork, 2006, Paper 2007-1) explain that rocks assigned to the Boss Creek unit occur over much of the north eastern part of the Takomkane batholith. This unit consists mainly of light grey, medium to coarse grained, equigranular rocks of predominantly quartz monzodiorite composition, but monzodiorite, granodiorite, quartz diorite, diorite and tonalite are also present. Mafic minerals commonly form 15 to 25% of the rock, and include varying proportions of clinopyroxene, hornblende and biotite.
Dykes of diorite to monzonite composition cut the volcanic and sedimentary rocks in the Anomaly Creek zone. The intrusive rock is locally altered to biotite, chlorite, epidote, magnetite, quartz and k-feldspar +/- trace tourmaline occurs in fractures and trace pyrite, chalcopyrite and bornite occur. Volcanic and sedimentary rocks are moderate to strongly biotite altered, fractured and contain variable amounts of dominantly quartz and sericite that are either in veinlets or replace the rock matrix. Trace to 15% pyrite, pyrrhotite and variable concentrations of gypsum, sphalerite, galena and trace chalcopyrite occur.
To the east, at the Hen, Dyke and Ledge prospects, the volcanic sediments are in east trending contact with a biotite-hornblende monzogranite to granodiorite stock, early Cretaceous in age (104.9 +/-1.9 Ma-Million years), for four kilometres adjacent to the Hen, Dyke and Ledge zones. This age is similar to that of the Boss Mountain stock (98-105 Ma) that is associated with the molybdenum deposits at Boss Mountain mine to the north.
The geological contact between volcanic and the easterly trending intrusive is locally irregular in shape, and dikes or sills occur up to several hundred metres from the moderately north dipping contact. Rocks within approximately one kilometre of the stock contact are strongly biotite-hornfelsed, contain between 1-5% pyrrhotite, pyrite, trace chalcopyrite and trace to 3% arsenopyrite. Dominant structures trend around 110 azimuth, generally subparallel to the intrusive contact. A petrographic report indicates the calc-silicate alteration consists of banded quartz, actinolite, tremolite, epidote, biotite, carbonate, k-feldspar, clinopyroxene, and pyrrhotite, chalcopyrite and arsenopyrite. Ilmenite, rutile, actinolite and possible scapolite, wollastonite and diopside have also been identified. Locally, up to 10% pyrrhotite occurs in calcareous volcanic rock and red garnet occurs locally in carbonate veins. Variable concentrations of disseminated and stringers of pyrrhotite, chalcopyrite, sphalerite, arsenopyrite and possibly stibnite(?) occur within the hornfels and calc-silicate zones. Gold and silver values occur with highly variable concentrations of copper, molybdenum, arsenic, zinc and antimony trace elements. The presence of molybdenum and an adjacent intrusive rock that is similar in age to the Boss Mountain molybdenum mine to the north is an interesting association.
The geology and alteration associated with positive gold values suggest the Hen, Dyke and Ledge prospects contain gold-bearing pyroxene, calcic skarn zones over a distance of four kilometres in proximity to an intrusive contact.