The Mag occurrence consists of massive magnetite (iron skarn) developed within an impure limestone horizon of the Stuhini Group. The magnetite body and limestone horizon are overlain by andesitic lapilli tuff. The magnetite body is at least 6 metres by 30 metres and weathers dark brown to black. The skarn is located on the northwest flank of a small, irregular altered granodiorite pluton believed to be coeval with the volcanic host rocks (Late Triassic).

In 2011 and 2012 Teck Resources Limited conducted a number of programs and surveys on its Eagle property which covered 61240.65 hectares and which was roughly bounded by Barrington River on the south, Hackett River on the North, Sheslay River on the west and Tahltan Lake, Tahltan River and Lovell Creek on the East. A total of 94 stream sediment samples, 208 rock samples and 2 U/Pb geochronology samples were collected in 2011; and 14 rock samples were collected in 2012. An airborne ZTEM survey conducted by Geotech Ltd. totalled 1800 kilometers in 2011 and 2906 kilometres in 2012 for a total of 4706 kilometres. A further airborne magnetic survey in 2011 totalled 1266 kilometres.

Teck was focused on mapping and the collection of rock samples in order to determine lithologic types. A total of 12800 hectares was mapped, mostly in the area extending 16 kilometes south from of Stone Lake and Hackett River. The Mag, located near the southwest corner of (and within) the Eagle property, appears to have been the only occurrence on the Eagle property. The Stan (104F 001), just west of Mag was encompassed by the aeromagnetic survey. A compiled geologic map is presented in Assessment Report 34266 (Figure 3). Several rock and stream samples were taken in the vicinity of the Mag showing. Teck identified several areas of weak chalcopyrite mineralization including new MINFILE occurrences in mapsheet 104J: Harper Reed, Gabb1, Gabb2, Hackett River SW and Stone Lake Molly.