The Kem 1 (Atty Gossan West, Atty 4) occurrence is located on a west-facing slope, approximately 2 kilometres south of Attycelley Creek and 3.5 kilometres east of Duncan Lake, about 191 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 by augite porphyry basalt, dacite and andesite crystal and lapilli tuffs and flows, and augite crystal tuffs and ash tuffs of the Stuhini Group. To the northeast and east lie dacite lapilli and crystal tuffs and breccias, and andesite crystal tuffs of the Toodoggone Formation, which are interbedded with conglomerate, sandstone and siltstone. The Early Jurassic Kemess pluton, a monzonite intrusive body that is part of the Black Lake Suite, outcrops to the south.

At the Kem 1 occurrence, silicified gossanous (limonite, hematite and goethite) zones in andesitic to basaltic volcanics, granite, diorite and monzonite host quartz-carbonate veins with disseminated pyrite and trace chalcopyrite and molybdenite. Sericite, specular hematite, magnetite, epidote and chlorite alteration minerals are also reported. A northwest trending quartz vein and other quartz-calcite veins with copper mineralization are also reported in the area associated with zones of shearing.

In 1981, two rock samples (61280 and 61290) of mineralized gossanous material assayed 10.0 and 2.8 grams per tonne silver with 0.46 and 1.95 grams per tonne gold, respectively (Assessment Report 10113).

In 1997, two rock samples (JBA64 and JBA78) from the western end of the gossanous zone yielded values of up to 0.95 gram per tonne gold, 27 grams per tonne silver and 0.14 per cent copper (Assessment Report 25486). In 1998, a rock sample (52265) assayed 1.00 per cent copper and 31.6 grams per tonne silver (Assessment Report 25722).

In 2000, rock sampling of the gossanous zone and mineralized shears yielded values of up to 0.78 gram per tonne gold, 27.6 grams per tonne silver, 0.157 per cent copper, 0.123 per cent zinc and 0.016 per cent molybdenum (Samples ATTY-RB00-03, -08, -10 and -11; Assessment Report 26360). In 2004, diamond drilling yielded intercepts including greater than 1.0 per cent zinc, 0.293 per cent lead and 7.3 grams per tonne silver over 1.53 metres in drillhole AT2004-3; 0.11 gram per tonne gold over 23.5 metres and 0.130 per cent copper, 0.270 per cent lead, 0.016 per cent molybdenum, 0.017 per cent tungsten, greater than 0.01 per cent cadmium, greater than 1.0 per cent zinc and 16.6 grams per tonne silver over 0.88 metre in hole AT2004-4, and 0.51 gram per tonne gold with 0.428 per cent copper over 2.17 metres in hole AT2004-7 (Assessment Report 27620).

The area was originally staked by D.W. Chisholm in 1929 as the Fokker mineral claim.

During 1969 through 1973, Kennco Explorations Ltd. completed programs of prospecting and soil sampling on the area as the Attycelley 1-6 claims. In 1977, Bishop Mines Ltd. completed a program of rock and soil sampling and a 2.0 line kilometre ground magnetic and electromagnetic survey on the area as the Audrey property.

In 1980, ABM Mining Corp. completed a 69.8 line kilometre airborne magnetic and electromagnetic survey on the area as the Audrey 1, 2, East and West claims and Kem 1-9 claims. Also, at this time, Inca Resources Inc. completed a program of soil sampling and a ground electromagnetic survey on the claims. In 1981, Texasgulf Inc. completed a program of geological mapping and rock sampling on the Audrey and Kem claims on behalf of Inca Resources. In 1982, Kidd Creek Mines Ltd. completed a program of geological mapping, trenching and rock sampling.

During 1990 through 1999, Electrum Resource Corp. conducted programs of prospecting, geochemical (rock, silt and soil) sampling, geological mapping and a 4.7 line kilometre ground magnetic and electromagnetic (VLF) survey on the area as the 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, seven diamond-drill holes totalling 1653.0 metres, and ground induced polarization and magnetic surveys on the area. In 2009, Finlay Minerals conducted a 2.6 line kilometre induced polarization survey 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.