The Mark showing is situated east of Ecstall River in an upper cirque basin, 61.7 kilometres west-southwest of Kitimat and 66 kilometres southeast of Prince Rupert.

It is within the Ecstall belt, a north-northwest trending, high-grade metamorphic belt bounded by the elongate mid-Cretaceous Ecstall pluton on the west and the Paleocene Quottoon pluton on the east (Aldrick 2001). Gareau (1991a) divided stratified rocks of the belt into four principal units: metavolcanic rocks, metasedimentary rocks, quartzite and layered gneiss.

Mineralization consists of quartz-sericite-schists with disseminated chalcopyrite and pyrite. The best historic rock samples from this zone are 0.14 per cent Cu. It appears that this rhyolite schist unit is on strike with the Thirteen Creek Zone (MINFILE 103H 054). A 2019 rock sample (3440034) uphill from the Mark showing returned 0.11 per cent Cu and 0.10 per cent Zn (Assessment Report 38705).

Kingfisher Resources Ltd. conducted a rock, soil and stream sampling program in 2019. Although rock sampling did return some anomalous values, especially at the Mark showing, it did not identify anything that would explain the strong stream sediment anomalies down slope. Lithogeochemical analysis outlined one sample (3440031) with extreme silicification and desodification (93.52 per cent SiO2 and 0.04 per cent NaO2) associated with a 50-centimetre-wide zone of fracture controlled intense mariposite alteration. This subvertical zone trends 340 degrees and is on trend with a zone of soil anomalism surrounding a rusty gully (Assessment Report 38705).

The Mark showing was part of a 2019 Airborne VTEM survey over Kingfisher's Ecstall property (Assessment Report 39155).