Dual-listed gold miner Yamana Gold on Friday announced positive results of the prefeasibility study (PFS) for its Agua Rica copper/gold project, including an “impressive and increased” net present value of $1.9-billion and an increased after-tax internal rate of return of 19.7%. The positive PFS results follow the March announcement of an agreement to develop Agua Rica using infrastructure and facilities of a joint venture that Yamana has with Glencore and Newmont Goldcorp in Argentina.