The Macquillan Zone occurs on the mostly forested slope north of the Sulphurets glacier and is primarily underlain by mixed sedimentary rocks of the Lower Jurassic Unuk River Formation, Hazelton Group. These sediments may consist of arkosic and lithic wacke, siltstone, conglomerate and tuffaceous interbeds. Intrusions of Jurassic monzonite to quartz monzonite are exposed nearby to the north and southeast (Open File 1988- 4).

In 2003, a chip sample of weathered porphyry assayed 0.47 per cent copper and 0.30 gram per tonne gold, while the surrounding altered sediments yielded up to 0.30 per cent copper and 0.66 gram per tonne gold (Lechner, M.J. (2007-04-06): Mitchell Creek Technical Report).

In 2005, Falconbridge Limited completed 4092 metres of drilling in 16 holes, distributed over six zones on its Kerr-Sulphurets property, one of them being the MacQuillan zone in which one hole was drilled. Disseminated and veinlet chalcopyrite and pyrite is associated with an altered feldspar porphyric intrusion, and mineralization occurs in both the intrusion and surrounding hornfelsed sedimentary rocks. The intrusion is strongly quartz-sericite altered, with variable stockwork of thin quartz veinlets, and is typically weathered and partially leached. The sedimentary rocks have been pervasively silicified and form massive, prominent rusty-purple weathering outcrops. Less silicified sedimentary rocks are calcareous, with local thin limestone beds that have been marbleized. A total of 10 partially leached rock chip samples taken by Noranda averaged 0.29 per cent copper and 0.23 gram per tonne gold over an area of at least 600 by 300 metres (Press Release Seabridge Gold Inc., July 25, 2005).

Copper mineralization, up to 1 per cent, is reported to occur in an area of pyrite-quartz-sericite alteration (Newmont Exploration Ltd. Map-Property File). A sample taken across 48.77 metres contained 0.245 per cent copper. Higher grade sections contained up to 1.03 grams per tonne gold (Bridge et al, 1981).

In 2005, Falconbridge conducted a drill program consisting of 16 drillholes totalling 4,092 metres. Five holes were drilled on the Iron Cap, 3 holes on the North Mitchell, 1 hole on the West Mitchell, 2 holes on the Icefield, 4 holes on the Main Copper and one hole on the MacQuillan (Assessment Report 28062).

Hole MQ-05-01 was collared between an IP anomaly and the cliff exposure, and oriented perpendicular to the interpreted trend of mineralization. Weak copper and gold assays stem from widespread, fine disseminated chalcopyrite associated with strong silica flooding, stockwork veining, and hydrothermal breccias. Host rocks are finely porphyritic, massive diorite or andesitic intrusive. Disseminated and veinlet pyrite content ranges from a few up to ten percent and increases with intensity of silicification. High arsenic values are due to fine arsenopyrite. There is a late set of ragged calcite veinlets which is likely related to regional deformation.

In 2012 and 2013, diamond drilling confirmed the presence of a distinct gold-copper porphyry mineralization system southeast of and below the Sulphurets deposit. Magnetite-bearing potassic alteration and hydrothermal breccias with chalcopyrite and gold values are reported to indicate proximity to a possible core zone. Drilling yielded intercepts ranging from 0.49 gram per tonne gold and 0.18 per cent copper over 283.2 metres in hole MQ-12-05 to 2.98 grams per tonne gold with 0.07 per cent copper over 18 metres in hole MQ-12-04 (Lechner, M.J. (2014-03-31): NI 43-101 Technical Report on Initial Deep Kerr Resource).

Refer to Mitchell – 104B 180 for a detailed work history of the Kerr-Sulphurets property. Refer to Sulphurets (104B 182).