The area of the Emu showing is located south of the King Salmon thrust fault within Paleocene to Eocene intrusions of the Sloko-Hyder Plutonic Suite consisting of quartz monzonite and quartz feldspar porphyry. These intrude Lower Jurassic sediments of the Takwahoni Formation, Laberge Group, and volcanic rock of the Upper Triassic Stuhini Group. The Jurassic Takwahoni sediments are situated to the north and south of a wedge of Tertiary felsic intrusive rocks.

The Takwahoni shales and siltstones are confined to the northern part of the claim and are thinly bedded, fresh, and brown in colour. Contacts between the intrusion and sediments are difficult to establish due to intensive fracturing and alteration. Contacts between these two units may be transitional along faults.

Quartz monzonite occurs throughout most of the claim area. It is generally fresh and often contains euhedral biotite and hornblende phenocrysts, and feldspar phenocrysts ranging up to 0.5 centimetre in length. A quartz-feldspar porphyry dike cuts through the central claim area and is comprised of a dense, often quartz-carbonate altered rock hosting disseminated pyrite. The quartz monzonite is slightly clay-chlorite altered. The strongest alteration is confined mainly to fault zones which show extensive iron-carbonate alteration and recessive weathering. Quartz-chalcedony and carbonate veins are mostly confined to fault zones. These veins occur irregularly and are up to 12 centimetres wide, crosscutting all rock types. Pyrite blebs and disseminations with traces of galena and sphalerite are common in some of the quartz veins.

Anomalous gold, silver, lead, and zinc values are restricted to quartz-chalcedony veins which host pyrite, sphalerite, and galena. The veins are found only in fault zones within or near the intrusion.

In 1982, rock samples collected from mineralized quartz-chalcedony veins assayed 0.675 gram per tonne gold, 17.0 grams per tonne silver, 0.26 per cent lead, 0.068 per cent zinc, 0.007 per cent antimony, 0.007 per cent copper, and greater than 1.0 per cent arsenic, and 0.001 gram per tonne gold, 0.2 gram per tonne silver, 0.0002 per cent lead, 0.034 per cent zinc, 0.002 per cent antimony, 0.006 per cent copper, and 0.015 per cent arsenic, respectively (Assessment Report 11108).

Chevron Canada limited staked the Emu claim in 1981. They followed in 1982 by collecting 12 rocks samples that included all rock types and veins throughout the claim.

In 1991, Omega Gold Corporation conducted a geochemical sampling program consisting of 79 rock samples, 47 soil samples and 7 silts on their A 1-8 claims which covered the Griz (104K 073), Griz 3 (104K 114) and Emu (104K 115) occurrences. Omega collected one sample in the area of the Emu showing that yielded 280 parts per billion gold from a gossanous float boulder, containing 10-20 per cent pyrite as disseminations and stringers, that was probably a quartz feldspar porphyry. (Assessment Report 21908).

During 2016 through 2020, Brixton Metals Corporation expanded their Thorn property through staking and acquisition of claims including those covering all the Griz (104K 073), Tardis (104K 112), Griz 3 (104K 114) and Emu (104K 115) showings. Refer to Thorn (104K 031), Chivas (104K 180), East Outlaw (104K 083), Oban (104K 168), Trapper (Inlaw) (104K 078) and Metla (104K 161) for details of the work history of the greater Thorn property.

As of early 2021, no work has been done on the Griz (104K 073), Griz 3 (104K 114) and Emu (104K 115) showings since 1991 and Tardis (104K 112) since 1987.