Gem Diamonds Limited · LSE:GEMD

Gem Diamonds — Technical Presentation (May 2015)

8 slides from Gem Diamonds's technical presentation, May 22, 2015

  1. Slide 1: Letšeng Mine – Life of Mine 2015 Update Presentation

    Letšeng Mine – Life of Mine 2015 Update Presentation 22 May 2015

  2. Slide 2: Summary

    Summary 2 The most recent update of the Letšeng Life of Mine plan (published 17 March 2015) has resulted in:  A significantly improved NPV over the life of the mine  A 15% increase in higher value satellite ore being treated annually from 2015 to 2019  A 39% increase in higher value satellite ore

  3. Slide 3: Background

    Background 3  Long term mine plans for Letšeng are updated annually on most current market and operational information  The 2015 update is of greater significance as it incorporates a significant steepening of the pit slopes made possible by improved blasting practices and pit-wall protection  Th

  4. Slide 4: Pit Wall Protection

    Pit Wall Protection 4 The following initiatives have contributed to pit wall protection resulting in the steepening of the pit walls:  Employment of a Blasting Engineer  Engagement of Blasting Consultant  Establishment of a Geotechnical Department  Improved wall and floor control – better pre-sp

  5. Slide 5: Planning Parameters/Results

    Planning Parameters/Results 5 Objectives Basis  To enhance value  2014 Reserve grades and prices  Optimise/defer waste  6mtpa of ore treated through Plants 1 & 2  Optimise/maximise Satellite contribution  Contractor operation (AV) to continue - end of 2016  Incorporate steeper slopes in pit d

  6. Slide 6: Waste Tonnes Mined - million tonnes

    Waste Tonnes Mined - million tonnes 10 15 20 25 30 35 40 0 5 2015 2016 2017 2018 2019 Waste Mining Profile 2020 2021 2022 2023 2024 Main Pit Waste 2025 2026 2027 Updated LoM Plan 2028 Satellite Pit Waste 2029 Waste Mining Tonnage Profile 2030 2031 2032 2033 2034 2035 2036 2037 6

  7. Slide 7: Tonnes Treated / Carats Recovered Profile

    Tonnes Treated / Carats Recovered Profile 7 Updated LoM Plan Treated Tonnes and Carats Recovered Profile 120 8 Ore Tonnes Treated - million tonnes 7 Carats Recovered - thousand carats 100 6 80 5 60 4 3 40 2 20 1 0 0 2017 2015 2016 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031

  8. Slide 8: Letšeng reserves and resources

    Letšeng reserves and resources 8 Carats Grade In-situ value As at 1 January 2014 US$/ct (millions) (cpht) (US$ billions) Letšeng Indicated Resource 3.23 1.73 2 086 6.7 Letšeng Reserve 2.26 1.71 2 045 4.6  2014 Extension of Indicated depth at Letšeng to 350m below mining face  Letšeng Life of Mine

Gem Diamonds — Technical Presentation (May 2015) on 6ix