Bisha Regional Exploration Program

  • Bisha has untapped District scale potential
  • Bisha has District scale exploration licenses
  • Established VMS exploration techniques generating growth
  • Nevsun continues aggressive exploration in 2015 - see more below.

Latest Exploration News

JUN 18, 2015   Nevsun Discovers New Massive Sulphide Deposit at Bisha
APR 28, 2015   Nevsun Continues to Expand Harena with High Grade Drill Results
FEB 3, 2015   Nevsun Delivers Significant Resource Growth from 2014 Drilling
DEC 17, 2014   Nevsun Extends Harena with Additional High Grade Drill Results

Exploration Presentation


Bisha District Deposit Configurations

For detailed information on each of our exploration targets, please click to expand or collapse any of the zones below.

+ Harena

Harena VMS (Volcanogenic Massive Sulphide) is situated on the Harena Mining License. Harena is 10 km south of the Bisha Main deposit. Harena was discovered in 2005 following the drilling of a gossan zone associated with felsic volcanic rocks. Harena has a small open pit reserve (see Operations for details) which was mined for oxide gold-silver ore in 2012/2013.

In 2014, exploration drilling was renewed at Harena to explain the large alteration signature of the deposit. The drilling in 2014 was highly successful and the results are summarized in a news release from December 2014. The resulting increase to Harena resources was announced February 3, 2015.

In 2015, success continues with select high grade intercepts:

HX-040: 1.8% Cu 5.8% Zn 0.5 g/t Au 31 g/t Ag over 32 m including
4.2% Cu 0.6% Zn 1.1 g/t Au 70 g/t Ag over 12 m and
0.4% Cu 8.8% Zn 0.2 g/t Au 8 g/t Ag over 20 m
HX-041:1.1% Cu 3.0% Zn 0.6 g/t Au 36 g/t Ag over 50 m including
2.2% Cu 6.5% Zn 2.6 g/t Au 87 g/t Ag over 4 m
HX-050: 1.7% Cu 6.6% Zn 0.4g/t Au 28g/t Ag over 67m including
4.6% Cu 3.4% Zn 1.0g/t Au 63g/t Ag over 22m and
0.2% Cu 8.2% Zn 0.1g/t Au 10g/t Ag over 45m
HX-051: 1.1% Cu 3.6% Zn 0.4g/t Au 22g/t Ag over 74m including
4.2% Cu 1.2% Zn 1.0g/t Au 62g/t Ag over 11m

The deposit remains open in several directions and work continues. See Exploration Presentation for more details.


Deposit Configuration - Harena


3D Model - Harena

 


Interactive Cross Sections - Harena

+ Bisha Main

Bisha Main makes up over 96% of Bisha reserves. More information is available from Operations page.

The Bisha Main deposit remains open in several directions. In the north end of the current open pit constrained resource the deposit is open, bottoming in high grade primary resource. On strike, the deposit is prospective for both primary and supergene copper mineralization as the deposit trends under a hill next to the pit that has a corresponding geophysical anomaly.

The program of work budgeted for 2015 includes:

  • Step-out holes at depth under Bisha Main for primary mineralization extension
  • Geophysical target under Guardian Hill for supergene/primary mineralization
  • Other geophysical anomaly(s) on Bisha mining License
  • Commence scoping of underground mining for Bisha primary at depth

Deposit Configuration - Bisha

See operations page

See Exploration Presentation for more details.

+ Northwest Zone

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.

No further work is planned in 2015 but the favorable horizon north and south remains highly prospective.

Resources - NW Zone

Maiden resources were declared at Northwest Zone in February 2014.


3D Model - NW Zone

 


Interactive Cross Sections - NW Zone

See Exploration Presentation for more details.

+ Hambok

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.

No further work is planned in 2015 but the Hambok region remains highly prospective.

Resources - Hambok

Maiden resources were declared at Hambok in February 2014.


3D Model - Hambok

 


Interactive Cross Sections - Hambok

See Exploration Presentation for more details.

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Operations