The EXTENSION occurrence is located 3 kilometres west of the north area of the Gibraltar Mine, 2.8 kilometres northwest of the north end of Cuisson Lake and 43 kilometres north-northwest of Williams Lake, B.C.

Dominant rock types in the region are metabasalt, limestone and argillaceous metasediments of the Mississippian to Triassic Cache Creek Group. These are intruded by the dioritic to quartz dioritic Late Triassic Granite Mountain pluton and the (?)Cretaceous Sheridan Creek pluton. The Granite Mountain pluton has been dated at 204 +/- 6 Ma by potassium-argon dating of hornblende (CIM Special Volume 15 page 195). Jurassic sedimentary rocks overlap both the Cache Creek and Quesnel terranes to the north and east of the plutons. Older rocks are largely obscured by Plateau Basalt of probable Miocene age, to the west. The Granite Mountain pluton has been affected by regional metamorphism (greenschist facies) and deformation along with the enclosing Cache Creek Group.

The Gibraltar orebodies are hosted by the Granite Mountain pluton with ore mineralization almost entirely confined to the Mine Phase Tonalite portion of the Granite Mountain pluton. The Mine Phase Tonalite (Trondhjemite) appears to form a thin outer shell about the main body of the pluton and contains approximately 30 per cent quartz, 50 per cent saussuritized plagioclase feldspar and 20 per cent chlorite.

The Extension showing, defined by a 2022 rotary air blast drill hole, is mainly hosted in Nicola volcanic rocks near the contact with the Granite Mountain Batholith Border Phase quartz diorite. Mineralization consists of disseminated pyrite and minor quartz-calcite veinlet hosted pyrite. Chalcopyrite and pyrite concentrations were most abundant between 91.4 and 106.7 metres downhole. The best intersection returned low-grade values of 0.205 per cent copper over 42.67 metres, including 0.704 per cent copper over 3.05 metres. Another intersection averaged 0.633 per cent copper over 6.1 metres (Assessment Report 41392).

In 2021, Gibraltar Mines Ltd. initiated a two-phase exploration program over the CKN claims to the east of the mine and several claims held adjacent to the mine. Phase I consisted of B-horizon soil sampling (1201 samples) and a 28 line-kilometre Titan induced polarization (IP) and magnetotellluric (MT) ground geophysical survey. Phase II consisted of a 14.4 line-kilometre IP survey and six NQ diamond drill holes totaling 2437.8 metres (Assessment Report 40520).

In 2022, Gibraltar Mines Ltd. carried out a further 125.4 line-kilometres of induced polarization across their property in addition to two RAB (rotary air blast drill holes) totaling 183 metres and two diamond drill holes (DDH) totaling 781.5 metres. RAB EXP2022-001, defines the Extension showing and targets a magnetic anomaly at the contact between the Border Phase quartz diorite and Nicola volcanics.

See Gibraltar North (Minfile 093B 011) for more detailed information on area exploration history and geology.