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About us Ambiotek SpA, is a spin off from Universidad de Santiago de Chile, that develops and offers environmental solutions for the mining industry. Ambiotek’s vision is to become a world class supplier for a more sustainable mining industry. 2

Ambiotek SpA supports mining industry in regulatory compliance and enhancement of its environmental liabilities giving added value to solid and liquid residues. Our offer is based on over 10 years of applied research with mining companies and our network of national and international partners. What do we do? 3

OUR OFFER Chemical & mechanical stabilization of mine storage facilities and surrounding areas Phytomining of mine storage facilities and surrounding areas Treatment of wastewater and acid water derived from miming activities 4

1. Chemical and mechanical stabilization of mine storage facilities and soil We prevent dispersion of dust and particulate material by using native plants and microorganisms. – Higher effectiveness at lower investment and operational costs – Up to 30% potential reduction of particulate matter due to air erosion – Potential metals recovery – Potential power generation – More aesthetically attractive solution Technology tested in Salar de la India (Chile) (Project FONDEF D06I1097), and implemented in Talabre (Chile) world's largest tailing dam. 5

1. Chemical and mechanical stabilization of tailings and mine soils Effectiveness (Parameters evaluated after 13 months of implementation) 6 Results from Pilot Plant - Project Fondef D06I1097:

The process has three steps: Diagnosis cost: MCh$ 5,000 Implementation cost per hectare: between Mch$ 30,000 to MCh$ 37,000 (*) (*) Cost fluctuates according to the specific conditions of the site and the tailings 1. Chemical and mechanical stabilization of tailings and mine soils Estimative Costs 7

8 1. Chemical and mechanical stabilization of tailings and mine soils Aesthetic and Environmental Benefit

Tailing dams have about tons of potentially extractable copper Sand of tailings: 0.2 to 0.4 % Cu Water of tailings: up to 2 ppm Cu at pH 7.5 Sediments: 0.4 % Cu 1. Chemical and mechanical stabilization of tailings and mine soils Copper recovery 9

10 1. Chemical and mechanical stabilization of tailings and mine soils Phytomining 1. Growth of metal hyperaccumulator/ accumulator plant species 2. Biomass harvest 3. Burning of biomass to recover the metal.

Theoretical yields based on data from empirical copper accumulation: - Grass (Polypogon australis): 7.0 tons dry weight/ha/year. Average copper accumulation: 4.6 kg Cu/ha - Woody (Atriplex deserticola): 20 tons dry weight/ha/year. Average copper accumulation: 26 kg Cu/ha - Phragmites australis: 52.7 tons dry weight/ha/year. Average copper accumulation: Cu 15.8 kg/ha Referential operational cost: 3 MUSD/ha Chemical and mechanical stabilization of tailings and mine soils Recovery potential & Operational Cost

2. Mining wastewater treatment, and acid water treatment 12

Biological systems (plants and microorganisms) to the depletion of copper and sulfate, and improvement of pH and electrical conductivity. The offer includes diagnosis, conceptual and detailed engineering, implementation and monitoring of the solution.. Technology being tested in a semi-industrial scale in Codelco Chuquicamata Mining wastewater treatment, and acid water treatment

3. Biofilter for depletion and/or recovery of metals Development of adsorbent matrixes made off native brown algae biomass for the recovery and/or depletion of copper, arsenic and boron. Technology at experimental stage. 14

15 Partnerships and collaborations

Contact 16