Bertil Norén. Processing Manager, Björkdalsgruvan. Euromine Expo, Skellefteå June 15, 2016
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1 Bertil Norén Processing Manager, Björkdalsgruvan Euromine Expo, Skellefteå June 15, 2016
2 A Values-Based and Value-Focused Company Profitable and Dividend Paying: (3.3% yield)* We create exceptional shareholder value through the acquisition of undervalued assets that can rapidly become cash generative, self-fund exploration, establish and maintain high operating margins and return cash to shareholders within a planned period of time. Mandalay is committed to operating safely and in an environmentally responsible manner, while developing a high level of community and employee engagement WE ARE SUCCESSFUL WHEN: Our employees live and work safely and experience the personal satisfaction that comes with high performance and recognition The communities in which we operate value our presence Our environmental impact is minimized and causes no permanent harm We have a large, diversified set of customers who are delighted with and compete for our products Our shareholders realize a superior total return on their investment and support our corporate values. Our values are visibly demonstrated by strong local management, at the point of impact with or stakeholders, and co-ordinated across the Company for maximum effect *Trailing 12 months dividends divided by current market capitalization (June 8, 2016) 2
3 Mandalay Resources - Björkdalsgruvan Björkdal Overview 3
4 Mandalay Resources - Björkdalsgruvan Short History: The deposit was discovered in Terra Mining opened the mine in July 1988 and ran it until it was bought out by William Resources in 1996 (legal entity: Terra Mining AB ). William continued to run the mine until June 1999, when the gold price fell sharply and it was forced to shut down. Production resumed in From the restart the owners have been International Gold Exploration, 2001 to 2003, Minmet, 2003 to 2007, Gold Ore Resources, 2007 to Elgin Mining Inc, Currently: Mandalay Resources. To date, the mine produced about 38,119 kg of gold or 1.23 million ounces (until 2015). 4
5 Mandalay Resources - Björkdalsgruvan Quick Plant Facts: 37 employees 2015 figures: Throughput ~ 1.3 Mton/year Utilization ~ % Recovery ~ 88.1% Average head grade ~ 1.22 g/t Au Average Tail ~ 0.14 g/t Au Installed nominal grinding power: = 1590 kw 5
6 Mandalay Resources - Björkdalsgruvan Yearly; Production, Grade, Recovery 1,400, ,200, ,000, , , , , Mill feed (ton) Mill feed g/ton Tot.rec. (%) 6
7 Mandalay Resources - Björkdalsgruvan 93 Recovery and Feed Grade Tot.rec. (%) Mill feed g/ton 7
8 Simplified Process Flow Sheet 8
9 Björkdalsgruvan Products Björkdal Products - Main Components- Sample [%] Gravity Gravity Flotation Knelson Conc Middling Conc Fe S Si Ca Cu Mg Al P Zn Trace As Zr < Ag Sb Te La Ce W (Au) % , Pb Bi Au [g/ton]
10 Mandalay Resources Björkdalsgruvan Occurrence of Gold In the Björkdal Process Products Neea Heino, M. Sc 10
11 Flotation Concentrate Foto/SEM study: Neea Heino, Geological Survey of Finland 11
12 Flotation Concentrate MLA/SEM study: Neea Heino, Geological Survey of Finland 12
13 Gravity Middlings Foto/SEM study: Neea Heino, Geological Survey of Finland 13
14 Gravity Middlings MLA/SEM study: Neea Heino, Geological Survey of Finland 14
15 Conclusions SEM/MLA Study: There is a high degree of liberation in all concentrate products (90-95%) There is a size effect; liberation drops ~10% from P80 to P95 Electrum is less liberated than gold (Knelson concentrate) Non liberated Au is associated with silicates, sulphides and tellurides. (Chemical correlations in concentrates are not explained by association) No significant correlation to any other elements/minerals. A longer XRF vs Au study is recommended MLA/SEM study: Neea Heino, Geological Survey of Finland 15
16 Projects 2016 Ongoing projects: Ore sorting with laser scattering (By Tomra sorting solutions) Upcoming Projects: Flotation expansion Extended Tailing Storage Facility 16
17 Ore Sorting Layout 17
18 Ore Sorting Layout 18
19 Ore Sorting Layout 19
20 Ore sorting at Björkdal Pilot studies confirm that: Au is contained in fragments of white quartz vein material, not in black wallrock material Can optically sort out 40+% of black rock and only lose a few % of gold recovery Potential to upgrade low-grade material or even high-grade material to increase mill head grade, producing more gold from existing mill capacity Onsite pilot plant in operation as of May 20 on 60,000 80,000 t test; good visual results after first days Expect test results in July-August Stockpiled Mixed Low-Grade Material Sorted Waste no veins Sorted Ore with veins Bulk Test Start Grade End Grade Times Upgraded Waste Rejection Gold Retained g/t Au g/t Au (%) (%) Underground Ore Stockpile Ore
21 Suggested Flotation Capacity Expansion In co-operation with Outotec (Sweden) AB Project Manager: Anders Rutdal, Outotec Objective: Increase flotation volume with 60 m 3 Implement two stage cleaning Decrease Au in tail by g/t Estimated project time: 9-12 Months 21
22 Suggested Flotation Capacity Expansion Flot Feed vs Tail3 (g/ton) (No outliers removed) (24th Feb - 15th April) R² = Flot Feed; Au [g/ton] Tail; Au [g/ton] 22
23 Suggested Flotation Capacity Expansion Flot Feed vs Tail3 (g/ton) R² = Flot Feed; Au [g/ton] Tail; Au [g/ton] 23
24 Suggested Flotation Capacity Expansion Layout 24
25 Mandalay Resources - Björkdalsgruvan Extended Tailing Storage Facility 25
26 Extended Tailing Storage Facility 26
27 Extended Tailing Storage Facility 27
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