The Hilltop showing consists of an extension of the quartz vein system at the Spokane (082FSE032) and Harris (082FSE078) occurrences), to the northeast, and several small associated veins at variable orientations. The showing is hosted by Hadrynian Monk Formation sediments of the Windermere Supergroup (correlative with pelitic rocks of the lower Horsethief Creek Group). These sediments have been intruded by granodiorite of the Middle to Late Jurassic Nelson Intrusions.
The general trends of the veins are east-west with steep north dips. The veins, which average 1 to 2 centimetres in width, host small lenses, stringers, and disseminations of pyrite, pyrrhotite, galena, sphalerite and some minor chalcopyrite. Gold and silver contents are apparently low.