Bisha Regional Exploration Program
Bisha has untapped district-scale potential. Bisha district deposits include: Harena, Bisha Main, Northwest Zone, Hambok and Asheli.
Latest Exploration News
April 4, 2017[pdf]Nevsun Extends Harena 150 Metres Beyond Current Resource and Identifies New Regional Targets from VTEM Survey
March 23, 2017[pdf]Nevsun Delivers Substantial Resource Growth at Bisha from 2016 Drilling
July 26, 2016 [pdf]Nevsun Increases Bisha’s Exploration License Area Nearly Twenty-Fold
June 1, 2016[pdf]Nevsun Continues to Intersect High Grade Mineralization at Asheli
April 19, 2016 [pdf]Nevsun Intersects Further High Grade Mineralization at Asheli
Bisha District Deposit Configurations
For detailed information on each of our exploration targets, please click to expand or collapse any of the zones below.
The Harena VMS (Volcanogenic Massive Sulphide) deposit is located 10 km south of the Bisha Main deposit. It was discovered by the drilling of a small gossan zone in 2005. From 2012 to 2013, Harena was mined for gold from its weathered oxide cap. Mining was suspended in 2013 at which time Harena had a remaining open pit indicated resource of 1.85 million tonnes grading 0.65% Cu and 3.90% Cu. In 2014, exploration drilling was renewed at Harena encouraged by the intensely altered felsic volcanic host rocks that suggested a much larger deposit was likely. Drilling since that time has been successful in expanding the deposit. Harena remains open at depth and as of December 31, 2016, has an open pit indicated resource of 3.95 million tonnes grading 0.87% Cu and 3.16% Zn and an open pit and underground inferred resource of 25.06 million tonnes grading 0.92% Cu and 4.75% Zn.
Deposit Configuration - Harena
Bisha Main makes up over 96% of Bisha reserves. More information is available from Operations page.
Deposit Configuration - Bisha
The Northwest Zone VMS lies within the Bisha mining license. The Northwest Zone is 2 km from the Bisha Main deposit. Bisha views the Northwest Zone as a potential source of supplemental feed for the processing plant at Bisha. The feed would provide additional cash flow as an extension to mine life without significant capital expense.
Geological mapping of the Bisha area in 2002 identified altered felsic volcanic rocks to the northwest of the (future) Bisha Mine with a coincident strong airborne EM response. In the fall of 2003, diamond drilling intersected potentially economic widths of copper, gold and silver massive and stringer sulphide mineralization. Follow up drilling in 2004 - 2006 and 2012 - 2013 identified copper and zinc VMS mineralization over a strike length of 800m that remains open to the northeast, southwest and at depth.
The favorable horizon north and south remains highly prospective.
Resources - NW Zone
Hambok VMS is a satellite deposit located 16 km southwest of the Bisha mill on the Mogoraib River Exploration License. Bisha views the Hambok deposit as a potential source of supplemental feed for the processing plant at Bisha. The feed would provide additional cash flow as an extension to mine life without significant capital expenses.
The Hambok massive sulphide body is a steeply east dipping, lenticular body. The massive sulphide body extends for over 1,000 m along strike, approximately 350 m down dip and is up to 75 m thick in the center of the lens. The ore body remains open along strike to north and south and down dip at depth.
The Hambok region remains highly prospective.
Resources - Hambok
Asheli VMS (Volcanogenic Massive Sulphide) is situated on the Mogoraib River Exploration License 23 km southwest of the Bisha Main deposit and processing plant. The Asheli deposit was discovered by Bisha Mining Share Company (BMSC) in April 2015 (see June 18, 2015 Press Release). The initial focus of exploration was a 700 metre long section of highly sericite and chlorite altered felsic volcanics with associated small, pod-shaped surface gossans within a five kilometre long horizon with similar geology. Limited historical drilling (ASD prefixed holes) had intersected only narrow stringer style mineralization with minor chalcopyrite and sphalerite but no massive sulphides.
Resources – Asheli
Maiden resources were declared at Asheli in March 2017.