April 28, 2015
Nevsun Continues to Expand Harena with High Grade Drill Results
Nevsun Resources Ltd. (TSX:NSU) (NYSE MKT:NSU) (Nevsun or the Company) is pleased to announce new assay results from exploration drilling completed on the Harena Mining License located 10 kilometers south of the Bisha Mine and processing plant. The drilling is part of the 2015 Bisha regional exploration program which builds on the highly successful 2014 program.
Intersections of high grade massive sulphide in Lower Zone include:
HX-050: 1.66% Cu, 6.62% Zn, 0.41 g/t Au, 28 g/t Ag over 67.2 m
including 4.61% Cu, 3.43% Zn, 0.99 g/t Au, 63 g/t Ag over 22.1 m
and 0.22% Cu, 8.18% Zn, 0.13 g/t Au, 10 g/t Ag over 45.1 m
HX-051: 1.09% Cu, 3.57% Zn, 0.43 g/t Au, 22 g/t Ag over 73.5 m
including 4.25% Cu, 1.17% Zn, 1.01 g/t Au, 62 g/t Ag over 11.0 m
Intersections of massive sulphide in Upper Zone include:
HX-043: 0.63% Cu, 5.70% Zn, 0.35 g/t Au, 28 g/t Ag over 18.5 m
New Gold Zone intersection confirming continuity:
HX-045: 7.49 g/t Au, 171 g/t Ag over 11.0 m
Lower Zone massive sulphide extended 120 m down dip with increasing width and grade
Upper Zone extended over 150 m along strike
Deposit remains open to depth and along strike
Nevsun CEO Cliff Davis commented, "We continue to have exciting results at Harena. The assays reported today demonstrate that the deposit is increasing in thickness and grade with depth as a core of high grade mineralization is being outlined. We also continue to see the deposit growing along strike to the south. These new results bode well for significant further expansion of the resource at Harena".
Three distinct high grade zones of mineralization being defined at Harena (see Figure 5 of this release).
Lower Zone: massive sulphide open at depth
Upper Zone: massive sulphide lens open on strike
Gold Zone: stringer and stockwork enriched gold zone
Holes HX-047, HX-050 and HX-051 were drilled to test down dip of hole HX-040 that returned 1.78% Cu, 5.78% Zn over 32.0 metres including 8.82% Zn over 20.1 metres and 4.19% Cu over 11.9 metres (see press release dated December 17, 2014). Both holes hit comparable intervals of massive sulphide to that of HX-040 with classic volcanogenic massive sulphide zonation consisting of an upper pyrite - sphalerite zone followed by a lower chalcopyrite - rich zone. Hole HX-050 is the deepest hole drilled to-date and with hole HX-051 demonstrate that the massive sulphide zone is increasing substantially in thickness with depth. Borehole Transient Electromagnetic (BHTEM) surveys completed in these and neighboring holes have defined a large high conductance geophysical plate associated with this mineralization in what is now being termed the Lower Zone. This zone appears to be the main core of the Harena deposit based on the thicknesses of massive sulphide encountered, the metal zonation and the high base metal content. It is still open at depth.
Hole HX-039 and subsequent holes HX-042, HX-043 and HX-049 were step-out holes approximately 150 metres to the south of the deposit targeting strong alteration in the host felsic volcanic rocks. These holes have intersected variable thicknesses of massive sulphide that are very zinc-rich. BHTEM has defined a large plate associated with this mineralization that suggests there should be considerable continuation of the mineralization to the south. This zone is now termed the Upper Zone and it is open along strike to the south.
Hole HX-045 targeted a gap in the drilling of the stringer mineralization that occurs between the Upper Zone and the Lower Zone. This hole successfully intersected stringer mineralization with 7.49 g/t Au and 171 g/t Ag over 11.0 metres and confirms the continuity of precious metal-rich stringer mineralization in what is now termed the Gold Zone. Further expansion of this zone to the south will be the goal of future drilling.
Regional Exploration Program
The 2015 Bisha Mining Share Company (BMSC) 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 and Tekewuda. Systematic surface and BHTEM surveys in combination with geological and lithogeochemical modeling is being used to successfully guide the exploration effort.
The 2015 Harena exploration results reported today are designed to expand the deposit beyond the known resource (see also press releases dated August 18, September 23, November 13 and December 17, 2014). Since drilling was renewed at Harena in mid-2014, the indicated resource at Harena has grown by 1.4 million tonnes and the inferred resource has increased by 6.1 million tonnes (see press release dated February 3, 2015). A plan map of the drilling and representative sections are attached at the end of this release. Drilling in part, is being guided by BHTEM surveys as the massive sulphides (particularly the copper-rich sections in holes HX-040, HX-047, HX-050 and HX-051) give strong electromagnetic responses.
A Quality Assurance/Quality Control program was part of the sampling program for the Harena work. This program includes chain of custody protocols as well as systematic use of standards, duplicates and blank samples into the flow of samples produced by the sampling. All samples were prepared at African Horn Testing Services (Eritrea) and analyzed at Genalysis Laboratories (a NATA registered laboratory) in Perth, Western Australia except for holes HX-050 and HX-051 which were prepared and analyzed at Bisha's on-site laboratory independently operated by SGS.
Drilling intercept lengths only are reported in the tables and text below.
Mr. Robert Foy P.Geo., BMSC's Exploration Manager, has been overseeing the drilling at Harena and is a Qualified Person as defined by NI 43-101. Mr. Foy has reviewed the technical content of this press release and approved its dissemination.
Received on Tue Apr 28 2015 - 09:45:26 EDT