VANCOUVER, BRITISH COLUMBIA -- (Marketwired) -- 05/23/13 -- Nevsun Resources Ltd. (TSX: NSU)(NYSE MKT: NSU) is pleased to announce diamond drill results from resource definition drilling at the Northwest Zone, located 1.2 km from the Bisha processing plant.
-- Northwest Zone still open to south, north and at depth-- Additional parallel zone discovered but limited drilling to date-- Mineral Resource estimate and Bisha Mineral Reserve update in early 2014
Select High Grade Results Include:
-- Hole NW-050 - 75.9 m @ 1.28% Cu and 0.18% Zn, from 131.1 m to 207.0 m in massive and stringer sulphide-- Hole NW-031 - 37.5 m @ 0.89% Cu and 4.13% Zn, from 96.0 m to 133.5 m in massive and stringer sulphide-- Hole NW-072 - 15.0 m @ 28.6 g/t Au from 38.0 m to 53.0 m in surficial weathered zone-- Hole NWDD-108 - 4.1 m @ 19.17% Cu from 64.9 m to 69.0 m in supergene- enriched massive sulphide
Bisha Mining Share Company (BMSC) has now completed the initial resource definition drilling program at its Northwest Zone located 1.2 km from its operating Bisha Mine. In 2013, 15,890 meters of drilling was completed at the Northwest Zone. This is in addition to 4,325 meters completed in 2011 and 13,520 meters completed in 2012. The system remains open to the north, south and at depth but drilling efforts have now shifted to the Hambok deposit to support 2013 work requirements on the Mogoraib exploration license.
Complete assay results received to-date from 2011, 2012 and 2013 drilling are included at the end of the release. Results from holes NWDD-129 - NWDD-201 are still outstanding but will be included in the maiden Mineral Resource Estimate.
Mineralization at the Northwest Zone is complex with a series of massive sulphide lenses hosted within altered felsic volcanic rocks. Both the footwall and hangingwall contain copper and zinc-rich stringer sulphide mineralization. Synvolcanic faulting and slumping associated with rhyolite cryptodomes and post volcanic faulting associated with regional deformation add complexity. The massive sulphides have been exposed to weathering at surface, oxide zones have been developed that are locally enriched in gold and beneath these areas, supergene copper mineralization may also be present. Core recovery is often poor in these zones as unconsolidated material is easily washed away and not recovered during the diamond drilling process. A program of RC drilling will be completed in these areas to better define the oxide gold potential.
The mineralized system at the Northwest Zone is extensive and resource expansion opportunities remain to the north, south and at depth. Further drilling is planned for the second half of 2013 to assess this potential. In addition, to the east there is a parallel zone of massive sulphide that is only defined by limited drilling. Further drilling on this new zone is also anticipated later in 2013.
Work for a maiden Mineral Resource Estimate at the Northwest Zone is in progress. This work in conjunction with an economic assessment of the impact of the Northwest Zone is expected to be included in a Mineral Resource and Mineral Reserve estimate update for the entire BMSC operation anticipated for early 2014.