R. William Thornton

Gravis Oil Corp. explores and mines oil and gas. It is engaged in the acquisition, exploration and development of a number of unproven heavy oil properties in the United States. Its activities to date have included analysis and evaluation of technical data, preparation of geological models, acquisition of mineral rights, exploration and development drilling, conceptual engineering, construction and operation of thermal demonstration projects, and securing capital to fund related expenditures. The company was founded on February 8, 2000 and is headquartered in Houston, TX.

Western Oil Sands Inc. designs, constructs and operates the principal facilities needed to mine, extract, transport, and upgrade the recoverable bitumen reserves found in certain oil sands deposits in northeastern Alberta

Part of Freehold Royalties Ltd., Petrovera Resources Ltd. explores for and develops heavy oil resources. The company is based in Calgary, Canada. Petrovera Resources was acquired by Freehold Royalty Trust from Canadian Natural Resources Ltd. on May 10, 2005 for $277.68 million.