Timok Project


Overview

Timok Project Location

The Timok copper-gold project consists of the Cukaru Peki Upper Zone and Lower Zone. Nevsun owns 100% of the Cukaru Peki Upper Zone. The Lower Zone is a joint venture with Freeport-McMoRan Exploration Corporation (Freeport).

Upper Zone Overview

The Timok project is located within the central zone of the Timok Magmatic Complex (TMC), in the Serbian section of the East European Carpathian-Balkan Arc. The TMC has one of the highest concentrations of copper enrichment in the Tethyan Belt.

The high sulphidation epithermal (“HSE”) mineralization in the Upper Zone comprises massive sulphide, semi-massive, and also vein, stockwork, dissemination and hydrothermal breccia matrix sulphide hosted by strongly altered (advanced argillic and argillic) andesite. The HSE mineralization forms a single coherent zone at depths ranging from 400 to over 800 metres below surface. Pyrite is the dominant sulphide mineral, and the principal copper mineral is covellite with lesser enargite, bornite and chalcocite occurring in veins, hydrothermal breccias, disseminations and replacement. Gold is associated primarily with the copper sulphides.

The Timok project comprises the Brestovac-Metovnica, Brestovac Zapad, Jasikovo-Durlan Potok and Leskovo exploration permits that are held by Rakita d.o.o., a Serbian subsidiary of Nevsun. The exploration permits cover an area of 212.58 sq. km.  The Brestovac, Jasikovo, and Leskovo Exploration Permits are subject to renewal in February 2017. The Brestovac Zapad Exploration Permit not subject to renewal until April 2018. The total area of the Timok project exploration permits is 212.58 square kilometers.

More on the Upper Zone project can be found here.

Timok Upper Zone PEA Highlights

  • 15 year mine life producing over 2.1 billion pounds or 0.96 million tonnes of payable copper
  • Sub-level cave mining with 3.3 million tonnes per annum conventional plant producing copper concentrate
  • After tax NAV of $1.5 billion at flat $3.00 per pound copper and 8% discount rate
  • $630 million in pre-production capital with 50% IRR and under 1.5 year payback
  • Located in an established mining jurisdiction supportive of new mining investment
  • Strong project economics support a wide range of financing alternatives
  • Upside potential from on-license exploration and gold in pyrite concentrate
  • Next steps: PFS and exploration decline start in Q1 2018 followed by FS in H1 2019

For more information on the Upper Zone PEA, please visit the news release here.

Resources

The Company released highlights from a Preliminary Economic Assessment on October 26, 2017. The report will be posted within 45 days of that release. The document was prepared by SRK Consulting (UK) Limited (“SRK”), an independent mining and geological consulting company, in accordance with the National Instrument 43-101 Standards of Disclosure for Mineral Projects of the Canadian Securities Administrators.

The updated Measured and Indicated Resource for the Upper Zone is estimated to be 29 million tonnes at an average grade of 3.7% copper and 2.4g/t gold, containing 1.1 million tonnes of copper and 2.2 million ounces of gold. The Inferred Resource for the Upper Zone is estimated to be 14 million tonnes at 1.6% copper and 0.9g/t gold containing 0.23 million tonnes of copper and 0.42 million ounces of gold. The Resource NSR value used to report the estimate is US$35 per tonne.


Timok Upper Zone Mineral Resource Statement (as at April 24, 2017)

 

Category (all domains) Tonnes
M
Grade Contained Metal
% Cu g/t Au % As Cu, M tonnes Au, M ounces
Measured 2.2 8.6 5.7 0.29 0.19 0.4
Indicated 26.6 3.3 2.1 0.2 0.87 1.8
Total Measured and Indicated 28.7 3.7 2.4 0.2 1.05 2.2
Inferred 13.9 1.6 0.9 0.06 0.23 0.42

Note: totals do not match sum of individual items due to rounding. Qualified person Martin Pittuck SRK UK

(1)  Resource NSR value used to report the estimate is $US 35 per tonne
(2)  All figures are rounded to reflect the relative accuracy of the estimate
(3)  Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability
(4)  Mineral Resource is reported on 100% basis

Lower Zone Overview

The Lower Zone is divided in ownership; currently, Nevsun owns 60.4% with Freeport-McMoRan Exploration Corporation (Freeport) holding the remaining 39.6%. Upon completion of a feasibility study, Nevsun will indirectly own 46% of the Lower Zone and Freeport will indirectly own 54%.

The Cukaru Peki Lower Zone porphyry-type mineralization is characterized by chalcopyrite-pyrite and occasional bornite and molybdenite occurring as disseminations and within quartz and quartz-magnetite stockwork veinlets. Anhydrite veins are common. Within the Lower Zone, porphyry-type potassic alteration is preserved locally but generally overprinted by sericite-clay, argillic and locally advanced argillic alteration. The latter overprinting also locally brings covellite-pyrite mineralization. The host rocks are predominantly volcanic andesite and andesite breccias.


The Lower Zone appears to be limited to the southwest and southeast by drilling and geological considerations, but could be reasonably expected to extend to the north, and possibly to the south beneath the Upper Zone where there are no holes extending to the depths at which the Lower Zone might be expected. The top of the Lower Zone mineralization occurs at depths below surface ranging from approximately 1400 metres in the west to 750 metres in the east. The vertical full extent of the Lower Zone is not known since several drill holes terminate in mineralization, but intervals up to 900 metres have been reported. The geometry of the Lower Zone remains to be defined by the ongoing drilling.

The underlying Lower Zone of porphyry type mineralization has not yet been modelled due to the lack of drill data and geometrical understanding, and is not included in the resource estimate.

Qualified Person

The Mineral Resources and the associated Preliminary Economic Assessment (PEA) were reviewed and approved by Martin Pittuck of SRK Consulting (UK) Limited, a Qualified Person under National Instrument 43-101, details of which can be found on SEDAR once the PEA is filed (~45 days following October 26, 2017). The PEA is preliminary in nature and it includes inferred mineral resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves. Mineral resources that are not mineral reserves do not have demonstrated economic viability. There is no certainty that the PEA will be realized.