Vancouver — An independent consultant has tabled an updated reserve estimate for the Storliden copper-zinc mine in northern Sweden. The mine is owned by North Atlantic Natural Resources, the 38%-owned subsidiary of
Micon International reports that proven and probable reserves stand at 1.4 million tonnes grading 9.7% zinc and 3.6% copper, plus 0.3 gram gold and 30 grams silver per tonne.
The deposit also hosts an indicated resource of 234,000 tonnes grading 7.7% zinc, 3.5% copper, 0.4 gram gold and 35 grams silver. This resource is expected to be upgraded to reserve-status as a result of underground drilling.
Between April and December of last year, 155,700 tonnes were mined, the average grades being 11.4% zinc, 3.6% copper, 0.4 gram gold and 35 grams.
North Atlantic discovered the volcanogenic massive sulphide deposit in 1997 following an airborne electromagnetic survey.
Storliden is hosted by a series of Proterozoic-aged metamorphosed sedimentary and tuffaceous volcanic rocks. These rocks have been invaded by intrusive quartz-feldspar porphyries, as well as mafic sills and dykes. The two principal styles of mineralization exist are high-grade massive sulphide and lower-grade disseminated-to-semi-massive sulphide.
Meanwhile, North Atlantic has acquired 34.5 sq. km near the Lappvattnet nickel prospect, also in Sweden, 25 km south of the city of Skelleftea in Vasterbotten province. The entire property now spans 100 sq. km and hosts numerous nickel prospects. The company is examining results from previous drilling, geological mapping, sampling and geophysical surveying.
Also, drilling is set to begin at the Norrbotten copper-gold project, near Sweden’s Kiruna iron mine.
Drilling on the 80-sq.-km project will focus on the 14-sq.-km S-1 Target. Previous work suggests that the zone is 700 metres long and, on average, 100 metres wide; it stretches to a depth of 250 metres.
Ground magnetic, induced-polarization and electromagnetic surveys are under way.
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