Reverse circulation drilling by Montreal-based Semafo (SMF-T) has extended the Nyaf gold-bearing structure, on the Mana property in Burkina Faso, some 300 metres to the northeast.
Selected results form the 23-hole, 1,332-metre drilling campaign include:
- Hole 113 – 9 metres (from 26 metres below surface) grading 18.4 grams gold per tonne;
- Hole 115 – 6 metres (from 29 m) averaging 8.9 grams gold, including 4 metres (from 29 m) of 12.9 grams;
- Hole 120 – 10 metres (from 21 m) running 10.9 grams gold.
- Hole 129 – 9 metres (from 42 m) of 11.1 grams gold;
Significant other intersections yielded between 2 and 18 grams gold over widths from 2-3 metres.
The latest holes have increased the Nyafe structure’s strike length to more than 2,400 metres. The oxidation zone has an average vertical depth of 50 metres.
Minearalization at Nyaf is associated with a major fault zone hosted by altered mafic schists interbedded with massive andesitic lavas. The gold-bearing rocks are mostly highly altered and schistose mafic tuffs. The rocks are also locally quartz-veined.
Some 1 million tonnes grading 8.5 grams gold have been outlined at Nyaf, Semafo’s original discovery at Mana. Nayf is one of three deposits at Mana.
Earlier this year, Semafo tabled an estimated indicated resources of 3.5 million tonnes grading 2.38 grams gold per tonne at the newly discovered Wona zone 8 km to the north. The estimated is based on a cutoff grade of 0.5 gram gold.
Of the total resource, 1.8 million tonnes of oxide ore run 2.45 grams gold and 1.7 million tonnes of sulphide ore average 2.31 grams gold.
The main TW-4 structure has been traced over a strike length of 2 km. The oxide resource has an average depth of 60 metres.
Mineralization at Wona appears to be hosted by three structures in highly deformed felsic tuffs. Locally, the rocks are silicified and quartz-veined.
Induced-polarization (IP) surveying has detected anomalies extending from Wona, as well as a separate anomaly to the east. In all, seven IP anomalies were identified.
The Maoula deposit is situated 3 km south of Nyaf and has been traced for 600 metres along a northeastern strike.
Semafo has boosted its stake in the Mana property to 95% via a partial buy-back of a local partner.
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