The Xen 1 occurrence is located on the eastern side of Tranquil Creek, approximately 4 kilometres north-northeast of the creek mouth.

The Tofino Inlet Pluton, of the Early to Middle Jurassic Island Plutonic Suite or the Mesozoic and/or Paleozoic Westcoast Complex, intrudes Paleozoic Sicker Group rocks. The plutonic rocks consist of quartz diorite and granodiorite. The Sicker rocks include volcanic breccias, tuffs, greenstone, greenschist and dikes and sills of andesite porphyry. The plutonic and volcanic rocks are transected by northeast trending faults.

Locally, quartz veins with blebs and disseminations of pyrite are hosted by a meta-andesite. The veins are steeply dipping with an east west strike. In 1984, sampling of the veins yielded 0.57, 0.15 and 0.32 gram per tonne gold across 200 metres (Assessment Report 13543). In 1985, a grab sample from a lensoidal stringer zone, 2 metres long and 0.4 metre wide along a 0.2 metre shear zone, yielded 0.28 gram per tonne gold (Assessment Report 14075).

In 1984 and 1985, Xenium Resources Inc. completed programs of geological mapping and rock, silt and soil sampling on the area as the Xen 1 and Xen 2 claims.