The A 2-3 occurrence is located at an elevation of 1300 metres near the northwest shore of a small lake, approximately 2.5 kilometres north of Attycelley Creek and 4.7 kilometres north-northeast of the north end of Duncan Lake, about 197 kilometres north-northwest of the community of Germansen Landing.

The Toodoggone district lies within the eastern margin of the Intermontane Belt and is underlain by a northwest-trending belt of Paleozoic to Paleogene sediments, volcanics and intrusions covering an area of 90 by 25 kilometres. The basement rocks are Proterozoic metasedimentary equivalents of the Hadrynian Ingenika Group. These rocks are unconformably overlain by volcanic and sedimentary units of the Devonian to Permian Asitka Group, which are in turn overlain by Upper Triassic basaltic to andesitic flows, volcaniclastics and minor limestone of the Stuhini Group. Volcaniclastic rocks of the Lower Jurassic Hazelton Group and rhyolitic to dacitic flows, intrusions and volcaniclastics of the Lower Jurassic Toodoggone Formation (Hazelton Group) overlie the Stuhini Group. Further to the west, nonmarine sediments of the Cretaceous Sustut Group overlie the volcanic strata and form the western margin of the district.

The Early Jurassic Black Lake Suite, of quartz monzonitic to granodioritic composition, has intruded the older strata in the central and eastern parts of the region and forms the eastern margin of the Toodoggone district. Within the district, syenomonzonitic and quartz feldspar porphyritic dikes may be feeders to the Toodoggone Formation.

The dominant structures in the area are steeply dipping faults that define a prominent regional northwest structural fabric trending 140 to 170 degrees. High angle, northeast-striking faults (approximately 060 degrees) appear to truncate and displace northwest-striking faults. Collectively these faults form a boundary for variably rotated and tilted blocks underlain by monoclinal strata.

Locally, the area is underlain predominantly by lithologies of the Attycelley Member of the Toodoggone Formation. Non-welded lapilli-ash tuff, subordinate lapilli-block tuff with interspersed ash flows and lava flows and interbedded epiclastics comprise lithologies of the Attycelley Member. Rocks of the Stuhini Group to the immediate west of the occurrence are generally massive, dark, coarse grained porphyritic augite basalt; fine grained aphyric basaltic andesite lava flows with subordinate interbeds of lapilli tuff and volcanic breccia (Bulletin 86).

Locally, banded quartz veins with minor pyrite host gold and silver values. The vein strikes 118 degrees and dips 75 degrees to the south-southwest. In 2004, a rock sample (2004T143) assayed 0.54 gram per tonne gold and 99.7 grams per tonne silver (Assessment Report 27620).

In 1983, Kidd Creek Mines Ltd. completed a program of geological mapping, trenching and rock sampling on the area as the Awesome claim. In 1988, Canadian Venture Corp. completed a 180.0 line kilometre airborne magnetic and electromagnetic survey on the area as the Nel and Nell claims.

During 1990 through 1999, Electrum Resource Corp. conducted programs of prospecting, geochemical (rock, silt and soil) sampling, geological mapping and 5.8 line kilometres of ground electromagnetic (VLF) surveys on the area as the A 1-7, At 1-2 and Atty 3-7 claims.

During 2000 through 2004, Finlay Minerals Ltd., conducted programs of rock, silt and soil sampling, geological mapping, hand trenching and ground induced polarization and magnetic surveys on the area.

During 2013 through 2016, Finlay Minerals conducted further programs of prospecting and geochemical (rock and soil) sampling and a LiDAR survey on the Atty property. In 2018, Serengeti Resources Inc. conducted a program of rock sampling, core re-logging and sampling, geological mapping and a 20.0 line kilometre ground induced polarization survey on the area as the Atty-ATG property.