The ETB occurrence is located on the eastern side of Tranquil Creek, approximately 2.5 kilometres northeast of the creek mouth and at an elevation of about 75 metres.

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, a shear zone with rusty weathering occurs. In 1984, chip sampling (samples ETB-E1 and ETB-E2) of the shear yielded 0.34 gram per tonne gold over 6.3 metres and 0.41 gram per tonne gold over 2.1 metres, respectively (Assessment Report 13441).

In 1983 and 1984, Euro Petroleum Corp. completed a program of prospecting, geological mapping and rock and soil sampling on the area as the Tranquil property. In 1988, D.H. Wood completed a program of prospecting. This included the blasting of several pits.