Informal invitation to contractors to prequalify for construction of two drill/blast tunnels, 8 km-long x 5 m-wide x 4.5 m-high, and 5 km-long x 4 m-wide x 4 m-high, steel supported and concrete lined, for Minera Los Pelambres at elevation 1.5 km in Andes. Contact Raíºl Paredes, e-mail rparedes@pelambres.cl 38/01.
