Recent drilling on a sulphide lens discovered last year at the north end of Brunswick Mining and Smelting’s (TSE) No. 12 mine near Bathurst, N.B., has extended the zone along strike and at depth. Most of the holes, however, contain relatively low-grade lead-zinc mineralization. To date, Brunswick says it has outlined an ore-grade lens over a strike length of 200 metres and vertical height of 170 metres. The new zone lies two kilometres north of the No. 3 shaft at a depth of about 1,100 metres.
The latest results include a 6-metre length grading 7.95% zinc, 3.64% lead, 0.37% copper, and 103.3 grams silver per tonne and a 1.4-metre length grading 10.76% zinc, 5.79% lead, 0.34% copper and 134.1 grams silver, from two surface holes. All of the intersections from underground holes, although relatively wide (up to 52 metres), averaged less than 1% zinc and 0.5% lead.
Having completed 9,619 metres of surface and 2,225 metres of underground drilling, Brunswick continues to probe the “Northend zone” with three rigs, two on surface and one underground.
In November 1989, Brunswick discovered the zone by pulling a 13.4-metre massive sulphide lens, including 8.5 metres grading 9.91% zinc, 4.61% lead, 0.22% copper and 183.4 grams silver from hole A-248.
While strikers show no sign of returning to the job, the Brunswick mill continues to operate at 20% capacity. Throughput in the third quarter averaged just over 2,000 tonnes per day with an 83.3% recovery.
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