Guanacevi Eyes Doubling of Silver Production in 2007
During 2006, Endeavour drove 6,800 m of underground ramps, sills, and raises at the Porvenir mine; purchased six new scoop trams; ordered two new jumbo drills; built two new underground electrical substations; and refurbished the mine offices. Plant improvements included installation of a new 10.5 x 12-ft ball mill, construction of a new electrical substation, and upgrading of the plant laboratory. During 2007, a plant expansion program will emphasize improvement of metal recoveries by upgrading the performance of the CCD leach, Merrill Crowe precipitation, and refinery circuits.
The Guanacevi district has been mined at least since 1535 and is renowned for its high grades. Historic production from the district is estimated at 500 million oz of silver and silver equivalent. Endeavour is currently mining grades of about 12 oz/st from vein widths averaging 3 m. NI 43-101 compliant reserves total 9.93 million oz of silver plus gold (10.85 million oz silver equivalent); indicated resources total 21.06 million oz of silver plus gold (21.23 million oz silver equivalent); and inferred resources total 9.99 million oz of silver plus gold (10.94 million oz silver equivalent).