Recent underground drilling by Kirkland Lake Gold (KGI-T) at the Macassa gold mine near Kirkland Lake, Ont., has expanded the recently discovered D Zone northward, southward, and up-dip.
Macassa has been drilling the new zone from the 3800 and 3400 levels of the mine in the area of the No. 3 shaft. The new zone comes within 35 metres of the shaft.
Recent holes, drilled on 15- to 50-metre spacings into the D zone, have intersected the zone for about 200 metres north to south along its strike. The zone varies from 0.5 metres to 4.1 metres in true width.
The grades are also highly variable, but some intersections have been quite high-grade. Among the better intersections were a 4-metre core length (3.4 metres true width) grading 33.3 grams gold per tonne (0.97 oz. per ton) and a 1.1-metre core length (0.9 metres true width) grading 110.7 grams per tonne (3.23 oz. per ton).
Apart from those two high-grade intersections, the eight most recent holes intersected gold values ranging from 2.4 grams to 20.9 grams per tonne. Four of the holes showed visible gold and telluride minerals in quartz-vein material. (Telluride minerals are typical of Kirkland Lake gold deposits.)
The zone has now been intersected for 390 metres up- and down-dip and for 330 metres along strike. Unlike the other mineralized structures at Macassa, which run roughly parallel to the east-west Kirkland Lake Break fault system, the D Zone appears to crosscut the main structures.
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