The Red Brick showing is located on a southeast facing slope near the headwaters of Treaty Creek, roughly 16 kilometres north of Brucejack Lake.

BCGS fieldwork in July 2025 documented an approximately 0.8 metre-thick iron formation bed within felsic volcanic strata of the Iskut River Formation (upper Hazelton Group, Middle Jurassic). The iron formation bed extends for at least 10 metres along strike, and is hosted within a moderately north-northwest dipping succession of felsic lapilli-tuff, felsic crystal tuff, felsic lapillistone, lesser volcanic siltstone, mudstone, siltstone, volcanic sandstone, felsic tuff breccia, and rare limestone.

Transmitted and reflected light microscopy show that the iron formation consists of hematite, minor magnetite, trace pyrite, and irregular blebs and veinlets of prehnite(?) and quartz. A geochemical sample from the iron formation returned high Fe (15.1 weight per cent), and moderately enriched Sb (22.9 parts per million) and As (74.9 parts per million) concentrations. High Fe and low Ti, Mn, and Al concentrations support classification as an Algoma-type iron formation precipitated from venting of hydrothermal fluids in a submarine volcanic arc, back arc, spreading ridge, or rift environment. Its geochemical signature is similar to VMS-associated iron formations globally and suggests potential for the broader area to host VMS mineralization (see EMPR FIELDWORK 2026, p. 143).

The Treaty Creek area has been explored since at least the late 1920s to early 1930s (see summary in EMPR ASS RPT 41893). Exploration in the area has resulted in discovery of broad quartz-clay argillic to advanced argillic alteration zones at the Treaty Gossan (MINFILE 104B 078) and Orpiment zone (MINFILE 104B 590), and a porphyry copper-gold deposit at Copper Belle – Goldstorm (MINFILE 104B 518, 704; Crowie and Kirkham, 2024, NI 43-101 Technical Report).