Project combines two stations in the remote Chanchamayo Valley region at Yanango and Chimay, the first for completion mid-2000 and the second a year later. Drill/blast contractors on the Tarma, Yanango access and valves chamber exit tunnels are Grana y Montero using predominantly Atlas Copco equipment in andesite. Jose Cartellone Construcciones Civiles driving 9.6 km using TBM from powerhouse location and drill/blast from an adit 7.5 km upstream. June 1999.Breakthrough reported on 4.3 km-long Chimay drive by 5.7 m-diameter Robbins TBM in ten months at rates of up to 190 m/week. Several areas of weak rock were encountered. Drill/blast drives also completed earlier this year. Visit www.robbinstbm.com May 2000.
