Slater then acted as mentor to business partner Ian Watson, through which Watson founded Centennial Minerals in 1982. It owned a major share in the Montana Tunnels gold mine, and was sold to Pegasus Gold at a substantial profit three years later. The pair formed Galahad Gold in 2002, successfully timing the commodities boom to make annualised 66% profits from gold exploration before winding the company down in 2007 and starting a new joint-venture, Agrifirma, this time investing in Brazilian agricultural farmland.