[2] Mount Pleasant's Fire Tower Zone contains tungsten-molybdenum mineralization, and is the site of a past-producing tungsten mine operated by Billiton from 1983 to 1985.

[5] In the early 1980s, Billiton invested approximately $150 million for the construction of a tungsten mine and mill at Mount Pleasant's Fire Tower Zone.

Subsequently, the company launched a number of programs designed to move the project towards the definitive feasibility study and mine activation phases.

These deposits occur within gently dipping Late Devonian age volcanic and sedimentary rocks that are the remnants of a large epicontinental caldera complex.

The regional geology in the mine area is dominated by the Mount Pleasant Caldera, the exposed part of which measures approximately 13 by 17 kilometres.