HomeCopperNevsun Resources discovers new sulphide deposit at Bisha

Nevsun Resources discovers new sulphide deposit at Bisha

Eritrea – Dual-listed Nevsun Resources has discovered a greenfield volcanogenic massive sulphide discovery at the grassroots Asheli prospect on the Mogoraib River exploration license, located 20 km southwest of the Bisha processing plant.

The Asheli drilling forms part of the 2015 Bisha regional exploration program which builds on the highly successful 2014 program. The regional exploration program is currently focused on three main areas: expansion of the Harena deposit at depth and along strike; exploring the perimeter of the Bisha deposit at depth and along strike; and, evaluating regional targets on the Mogoraib River license at Asheli, Aderat and Tekewuda.

Asheli Prospect

The Asheli area was targeted for the initial drill testing of the over 5 km long Asheli Trend which is characterised by an extensive highly siliceous felsic fragmental unit that has numerous geophysical anomalies associated with it.

Having previously been tested, Bisha Mining Share Company re-evaluated the area by field mapping and completing a lithogeochemical analysis of the volcanic rocks. This work defined a 700 meter long zone of highly sericite and chlorite altered felsic volcanic stratigraphy associated with gossan zones enhancing the probability that a VMS deposit was likely to be found in the area.

High grade massive sulphide intersections include:Nevsun - Asheli prospect drill hole location map

  • MX-052: 2.29% copper, 4.50% zinc,  0.45 g/t gold, 37 g/t silver over 22.9 m
    Including 3.67% copper, 8.04% zinc, 0.68 g/t gold, 50 g/t silver over 7.4 m
    and 7.92% copper, 3.89% zinc, 1.14 g/t gold, 101 g/t silver over 2.9 m
  • MX-056: 1.26% copper, 6.08% zinc, 0.28 g/t gold, 26 g/t silver over 20.9 m
    including 1.71% copper, 8.51% zinc, 0.37 g/t gold, 35 g/t silver over 10.9 m

The Asheli discovery highlights the prospectivity of the Asheli Trend. With only 1 km of the trend drill tested during this first phase of exploration and an additional 4 km that has never been drill tested and having similar geology, the likelihood of further discoveries is high. Rainy season begins in mid-June and will require further work to be paused until later in the year.

“We continue to have excellent results from our exploration programs at Bisha. The assay results demonstrate that the Bisha District hosts numerous deposits like other classic volcanogenic massive sulphide (VMS) camps worldwide.

“Our new greenfield discovery at Asheli is exciting in that it shows that the mineralising systems on the Asheli trend are capable of producing high grade deposits with good thicknesses of massive sulphide. With over 4 km of untested strike length with similar geology the potential for further discoveries on this trend looks very promising”, says Nevsun CEO Cliff Davis.

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Chantelle Kotze
Chantelle Kotze is a Johannesburg-based media professional. She is a contributor at Mining Review Africa (Clarion Events - Africa) and has created content for the media brand over the past 6 years.