Rio Tinto, a mining company, completed a $20m investment in Western Copper and Gold, a copper and gold explorer. "We are pleased to welcome Rio Tinto as a strategic investor in the company. The investment by Rio Tinto, a leading global mining group which operates in 35 countries around the world, and whose purpose is to produce the materials essential to human progress is a strong endorsement of the Casino Project. We look forward to working with Rio Tinto to advance Casino," Paul West-Sells, Western Copper President and CEO.