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Abstract

Audrey Resources Inc.'s Mobrun Mine is located in Dufresnoy Township, some 30 km northeast of Rouyn-Noranda, in Northwestern Quebec (Fig. 1). Rio Algom discovered The Mobrun Main Lens by means of a mobile road E.M. survey. Until 1985, the drill estimated 3.3 million metric tonnes of massive sulphides were not considered economic. Increasing metal and gold prices enabled Audrey start selective production in June 1986 for metallurgical testing purposes.

Underground development and detailed diamond drilling on the Main Lens have outlined 1 523 000 t of economical massive sulphides (proven reserves) grading, 0.80 % Cu, 2.44% Zn, 30.19 g/t Ag, and 2.2 g/t Au (to a depth of 300m) to be outlined, of which 465 000 t have been mined.

Additiona1 dri11 indicated reserves, pertaining to the 850-870-930 Lens system, total 180 000 t grading; 1.20% Cu, 2.41% Zn, 42.23 g/t Ag, and 4.98 g/t Au, to a depth of 300m. These satellite lenses, discovered while attempting to delineate the eastern extension of the Main Lens, are accessible through development on levels 4, 5, and 6 (respectively 200, 250, and 300m below surface).

Subsequent surface drilling in 1988, aimed at defining the eastern depth extension of the 930 Lens, defined a strong Pulse E.M. anomaly with a source beneath the holes. On March 30, 1988, discovery hole, Au-88-42, cut 17.6 m of semimassive sulphides followed by 18.6 m of massive sulphides. As of February 1989, probable economical reserves for the 1100 Lens stood at 10 400 000 t grading 0.76 % Cu

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