From January 2013 Too bad it never happened Guyana Goldfields Announces Updated Feasibility Study with $800 Million NPV and 38% IRR (After-Tax) TORONTO, January 11, 2013 – Guyana Goldfields Inc. (TSX: GUY) (the “Company”) is pleased to report the key findings from its NI 43-101 Technical Report, Updated Feasibility Study (“FS”) for the 100% owned and fully permitted Aurora Gold Property (the “Project”). The FS was authored by Tetra Tech Inc. with contributions from SRK Consulting Inc., Bluhm Burton Engineering, Itasca International Inc., Environ International Corporation, and others. The FS will be available on SEDAR and the Company website within 45 days. The estimated initial capital required to achieve commercial production is US$205 million and reflects numerous positive changes, in particular, the phased mining and milling approach, reduced footprint of the mine site and facilities, and utilization of an optimized mobile equipment fleet. Based on the key findings of the FS, the Company will continue to move forward with mine construction and development of the Project. The improved mine plan produces 3.29 million ounces of gold over an initial 17 year mine life at an operating cash cost of US$527 per ounce (including royalty). Average annual gold production over the life of mine is 194,000 ounces, and averages 231,000 ounces per year over the first ten years. Gold production peaks in 2020 at 349,000 ounces. Commercial production is expected to commence in Q1 2015. Gold production will be staged, with initial open pit production of 5,000 tonnes per day from the Rory’s Knoll deposit and expanding to 10,000 tonnes per day in early 2018 when underground mining commences.