Euromax hosted a visit to the Ilovica-Shtuka site in November 2016; the following is a summary of the salient points.
Post-feasibility optimisation
Euromax released the results of the definitive feasibility study (DFS) on Ilovica-Shtuka on 6 January 2015. The study was conducted by Amec Foster Wheeler, Tetra Tech, DMT, Golder Associates and Schlumberger, among others, and calculated pre- and post-tax NPVs of US$513.0m and US$440.1m, respectively, at a 5% discount rate and long-term metal prices of US$1,220/oz Au and US$2.90/lb Cu. Corresponding internal rates of return were 19.8% and 17.8%. Capex was lower than in Euromax’s 2014 pre-feasibility study, at US$474.3m vs US$501.8m. Updated World Gold Council-defined adjusted operating cash costs were estimated to be US$200/oz and all-in costs to be US$372/oz (after Cu credits), which should put Ilovica-Shtuka well within the industry’s lowest-cost quartile.
The well-known mining consultant SRK has subsequently optimised the feasibility study. While exact details of the revisions are not known, a summary of key points is as follows:
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The mine plan has been updated so that it identifies working benches on a monthly level of detail and dovetails correctly with the tailings embankment raises, which utilise mine waste rock.
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The key effect resulting from the updated mining plan is reported to be the strip and pre-strip in early years, which has been adjusted to allow the mining of more waste, earlier, to reflect the lack of ore in the upper levels of the pit (effectively just below a ridge at the top of a moderately steep hill) – in part as a result of the decision to classify oxide material as waste. The overall effect of this adjustment is marginal however, with the strip ratio increasing from 1:1 to just 1.1 to one.
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Throughput is unchanged at 10Mtpa. However, it will now be achieved with a smaller fleet. Whereas it had been assumed to employ two hydraulic shovels with a fleet of up to 19 rigid dump trucks, the mining schedule is now assumed to be achieved using an up-scaled fleet comprising one shovel and 10 trucks of larger size (although not the largest size). Note that the possibility still remains to use smaller shovels and (possibly) smaller trucks from years 10 and 11 of a 19-year mine life.
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In part, the need for a smaller fleet of higher tonnage trucks can be justified by the decision to employ a high angle (sandwich) conveyor belt to convey ore from the bottom of the pit to the plant stockpile instead of trucking it, which was taken after the conclusion of a trade-off study between the two.
The economic consequences of the optimisation
Costs are continually updated as engineering advances. In the most recent iteration, capex costs and mining costs are said to have increased, primarily as a result of the up-scaling of the mining fleet. In the meantime however, initial bids returned on the mills and crusher indicated that capex relating to process equipment will be significantly reduced.
Euromax’s feasibility study and front-end engineering & design process was conducted by AMEC Foster Wheeler for plant and process design, DMT and SRK for mining, Golder Associates and Skopje University for tailings management, SGS for metallurgy and Tetra-Tech for geology.
Since then, Euromax has invited tenders for EPCM and/or EPC contracts relating to the construction and management of the process plant. A number of existing and new contractors are reported to have tendered bids in this process. In the meantime, Ilovica’s funding consortium of banks has retained Runge Pincock Minarco (RPM) as its independent engineering consultant and D’Appolonia as its environmental consultant.
Engineering, technical and geotechnical matters
In general, many design features of the Ilovica-Shtuka pit are controlled by the topography of the area. Nevertheless, in common with the mine plan, SRK has also significantly updated the analysis around the pit’s geotechnical parameters. In the first instance, this has involved recognising six different mining domains, compared to the one initially assumed. Among other things, this allows it to apply more appropriate geotechnical criteria to its ultimate design features. While drilling to this end is ongoing and the process has yet to be finalised, one immediate effect is that has resulted in a flattening off of the pit slopes from 43° to 37°. In addition, it has also resulted in SRK identifying intermittent (albeit impure) clay in a specific fault contact zone, 150m down into the pit, which will have to be allowed for in the pit’s eventual bench design.
Tailings storage facility
In simple terms, the tailings storage facility (TSF) for the Ilovica-Shtuka mine will be located in the adjacent valley. This is being configured as a rock-filled, down-stream raised engineered waste dump. Since it is in an area designated an earthquake area, it therefore also needs compaction, to which end it has been decided to adopt a pallet dumping method of deposition.
Water infrastructure in the region includes the small Ilovica reservoir in the immediate vicinity as well as a larger (under-utilised) one some 15km away. Euromax is currently working with the local water company on plans to install a pipeline between the two to allow water to be pumped from the larger reservoir to the smaller one. This will beneficiate the local water supply and improve the quality of drinking water. It will also allow Euromax to use the smaller reservoir as an effective holding dam for water for its mining and processing operations. In addition to the existing reservoirs, Euromax is also drilling in the valley to establish the potential for groundwater in line with the terms of its environmental requirements.
Under the terms of its long-term power purchase agreement with the electricity utility company, MEPSO, Euromax is designated a ‘qualified consumer’, which gives it direct access to high voltage grid power.
The plant’s ultimate products are gold doré bars and a copper-gold concentrate. Gold doré will be transported using a dedicated security service. In the meantime, the copper-gold concentrate output will be transported to Pirdop in Bulgaria for smelting using 20 30t trucks. Initially, Euromax will build a temporary road over state land to accommodate this transportation requirement. The road will be constructed on a ‘lease, rehab and return’ basis. In due course however, Euromax plans a new, permanent, dedicated road to be built over private land from the mine site to Macedonia’s main arterial road link to Bulgaria.
Macedonia has a dry, mild climate and the Ilovica-Shtuka project is located on the slopes of a relatively steep hill covered in (largely) Mediterranean oak bushes, which are generally no more than about 10 feet tall. It is therefore typically used by villagers as a source of firewood.
The majority of the land underlying Euromax’s area of operations is state owned. However, some of the state parcels are co-owned with private owners via inheritance and Euromax’s strategy has been to trace these owners and to settle compensation with them, with compulsory purchase as a last resort.
Ilovica-Shtuka is a relatively large project for both the region and the country (it will account for between 1-2% of Macedonian GDP alone), situated in a poor area with high unemployment. As a result, there has been no opposition to the project from any quarter and no objections have been raised by any NGOs. After its exploitation licence was granted in 2013, Euromax opened an Information Centre in Ilovica and has been operating an ‘open house’ consultation policy with respect to the project. The company reports most of the enquiries at the centre to date have concerned employment.
In the meantime, Macedonia held parliamentary elections on 11 December. The elections were called following an EU-brokered agreement after the prime minister, Nikola Gruevski, stepped down in January after being accused by the leader of the opposition of wiretapping tens of thousands of Macedonian citizens. Gruevski denied any culpability in the affair. In the ensuing elections, his party the nationalist VMRO-DPMNE, won 51 of 120 parliamentary seats (a reduction of 10 compared to the previous election). The opposition Social Democrats won 49 seats, while the main ethnic Albanian party – the Democratic Union for Integration (DUI) – which has long been junior partner in coalition with the governing VMRO-DPMNE, came third with 10 seats, giving the government a technical majority of one. Election observers from the Organization for Security & Co-operation in Europe said that the voting had been conducted smoothly. Observers said there had been some irregularities but that no political party had complained about either the electoral process or the result.
While the election had been seen as a delaying factor regarding construction permits at Ilovica-Shtuka, the eventual granting of the permits was never perceived as being in doubt, given that both main parties in the election had voiced their support for the project. Nevertheless, the continuity afforded by the incumbent government’s victory should be helpful in expediting the process and Euromax now expects final construction permits to be granted early in 2017.
In general, Ilovica-Shtuka is situated in the drier east of the country. Owing to its location in a mountainous region however, it attracts above average rainfall of c 600-700mm per annum, albeit this is comparable to London (c 600mm per annum) and significantly less than New York City (c 1,270mm per annum). As noted previously, water infrastructure in the region includes two reservoirs, which the local water company plans to link. In addition, Euromax is also drilling in the valley to establish the potential for groundwater supplies. Euromax submitted its Environmental Impact Assessment to the Macedonian Ministry of Environment in H116 as the first step towards its international Environmental & Social Impact Assessment (ESIA). Whereas the ESIA requires a long-term water management plan, there is no such practical requirement at a local level. In addition, there are very few reclamation requirements at the mine site, other than to strip out the remaining equipment at the end of the life of the mine and to re-vegetate the area.
With respect to fauna, the only impediment to the mine appears to be that the region is a prime butterfly area. As a result, Euromax is conducting a study, presided over by a local academic and lepidopterist, including the potential to designate a neighbouring region as a prime butterfly area in mitigation.
Ilovica-Shtuka is located on the Tethyan magmatic arc that covers large areas of central Romania, Serbia, Macedonia, Bulgaria, Greece and Turkey. It is associated with a poorly exposed dacite-granodiorite plug on the north-eastern border of the Strumica graben and was previously explored by the Geological Institute of Macedonia. At surface the Ilovica intrusive complex consists of a central dacitic breccia diatreme that has been intruded by at least one dacite and two granodiorite porphyry stocks that have generated several hydrothermal pulses, resulting in widespread, multi-phase veining at depth within a mineralised stockwork with granodiorite (below) and dacite (above). The plug is hosted within granite, which is easily identified by an absence of trees.
As with many such systems, material blue-sky geological upside exists if Euromax can identify and delineate the underlying feeder zone.