The Har 3 is underlain by Lower Jurassic Hazelton Group porphyritic andesites and plagioclase meta-diorite with minor limestones, andesites and andesitic lapilli tuffs. These are intruded by the Early Jurassic Melville Pluton, a hornblende-biotite to quartz diorite. A major Tertiary dike swarm intrudes the andesites.

A massive magnetite showing was located along the northern margin of a glacier on the Har 3 claim. This skarn type showing is associated with the contact of granodiorite and a banded limestone unit. Gossanous zones within this showing contain up to 80 per cent magnetite, 5 per cent pyrite and 5 per cent hematite. Brecciated zones of intrusive rock are also evident in this zone.

Work History

In 1989 a limited amount of Assessment work was completed on the Cop, Har 1 and 3 claims for Westmar Resources Ltd (Assessment Report 19813). A total of 15 rock chip samples were collected but no anomalous results were obtained.

In 1990, Kinghorn Energy Corp collected 147 rock samples and 3 pan concentrate samples the Cop, Har 1 and 3 claims (Assessment Report 21463).

In 2006 and 2007, Hathor Exploration Ltd. completed a 7228.7 line-kilometre airborne geophysical survey on the area as the Macgold claims of the Iskut project. In 2008, Max Minerals Ltd. examined the property.

In 2020, Eskay Mining Corp. completed a program of prospecting, rock sampling, ground and airborne geophysical surveys and 4335 metres of diamond drilling in 20 holes on the area as part of the Sib-Corey-North Mitchell property. The geophysical surveys consisted of a 911.7 line-kilometre airborne electromagnetic survey, a 55.85 line-kilometre induced polarization survey and a 43.19 line-kilometre magnetotelluric survey. Drilling was performed on the TV (MINFILE 104B 385) and Jeff (MINFILE 104B 525) occurrences.