The golden square mile As the name implies, Guyana Goldfields is developing a property in the South American country of Guyana for a combined pit mine and underground mine that will be the largest gold operation in the country, Gary Toushek learns. Toronto-based Guyana Goldfields, Inc. was a junior exploration company when Claude Lemasson joined as president and COO in early 2009. After drilling for the previous four years, it had a large discovery in Guyana on its hands called the Aurora Project, and within a property covering 110,000 acres.