Outotec Gold Processing Solutions

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1 Finland, September Outotec provides leading technologies and services for the sustainable use of Earth s natural resources. As the global leader in minerals and metals processing technology, Outotec has developed many breakthrough technologies over the decades. The company also provides iovative solutions for industrial water treatment, the utilization of alternative energy sources and the chemical industry. Outotec shares are listed on NASDAQ OMX Helsinki. Outotec Gold Processing Solutions Outotec offers solutions from equipment to complete production plants and a full range of services that are tailor-made to the customer's needs. With expert knowledge in operation and maintenance together with proven technologies and equipment covering the total gold production chain, we are able to reduce process risks and guarantee the optimal technology fit and process results. Benefits Efficiency capture from a one stop shop Optimized total expenditure for the entire plant life cycle Process guarantees Global service network Experienced staff with operating plant background info@outotec.com Copyright 2013 Outotec Oyj. All rights reserved.

2 002 Outotec Gold Processing Solutions Outotec Gold Processing Solutions 003 A reliable partner for your gold operations Outotec provides the mining and metallurgical industry with advanced solutions for processing a variety of gold ore types ranging from free-milling ores to refractory gold ores. Our process solutions include comminution, flotation, pressure oxidation, roasting, leaching and recovery with analyzers and automation systems. Tailings and effluent treatment are an integral part of our solution offering. Outotec's competitive edge is based on our extensive experience in minerals processing, hydrometallurgy and pyrometallurgy combined with our proven technologies and equipment. In-depth process and plant knowledge make Outotec a unique strategic partner for our customers. The expertise of two Outotec in-house R&D centers with state-of-the-art laboratories and pilot plants is utilized in designing our process solutions. Outotec's HSC Chemistry software offers a modern way for simulating processes by using the data received from test work. Outotec s capability to combine process and automation design is vitally important. The provision of process design, plant engineering, equipment, automation and project management from Outotec eliminates expensive and restrictive interfaces during implementation. Outotec offers: Iovative and proven technologies Laboratory test programs and pilot test campaigns Scoping and feasibility studies Basic and detailed engineering Proprietary, key equipment and technology supply Process automation and instrumentation Training, commissioning and start-up services Operation and maintenance services Spare parts Plant audits, retrofits and equipment upgrades

3 004 Outotec Gold Processing Solutions Outotec Gold Processing Solutions 005 Concentrator and pressure oxidation technology for Petropavlovsk PLC Outotec recently supplied engineering, process equipment and technology to Petropavlovsk PCL, the second largest gold producer in Russia with assets located in the Far East. Extensive batch and continuous pilot autoclave test work and flowsheet development has been completed by Petropavlovsk in state-of-the-art laboratories in St Petersburg and Blagoveshchensk. Outotec s engineering expertise and proprietary process equipment were combined together with Petropavlovsk s process know-how. Outotec s delivery comprises flotation plant including all process equipment, instrumentation and process control system for the Malomir concentrator, as well as the entire pressure oxidation circuit including all process equipment and process control system for the Pokrovskiy pressure oxidation plant. Both the Malomir concentrator and Pokrovskiy pressure oxidation plants are currently under construction. Gold ore beneficiation Outotec offers an extensive selection of comminution, flotation and dewatering solutions and equipment with a high level of automation and process control enabling the optimization of gold beneficiation plant performance. Outotec's minerals processing technologies have been developed to provide comminution for various downstream processes and produce concentrates of every category with maximum efficiency. Outotec flotation solutions are always tailored to the customer s needs to reliably secure high gold recoveries. Outotec's dewatering solutions complement perfectly the total production chain and offer variable options to choose from. The latest proprietary technologies in ore beneficiation includes the Outotec HIGmill, enabling ultra fine grinding. Based on our life cycle approach, we are willing to support our customers on an operate and maintain basis. Outotec's know-how and solutions covering the total gold ore beneficiation and processing chain enable us to help you to reduce the environmental burden related to your operations. Due to declining ore grades, future gold processing plants require higher capacities demanding less but larger scale equipment, with a smaller footprint conserving energy, and reducing maintenance and manpower costs. Outotec equipment for beneficiation: Outotec autogenous, semi-autogenous, rod, ball and pebble grinding mills as well as Outotec HIGMill for high intensity grinding for fine, ultra fine, and regrind applications Outotec TankCell, OK and SkimAir flotation machines Outotec OKTOP conditioner Outotec high-rate and paste thickeners Outotec Larox filters Outotec Courier on-stream XRF and Outotec PSI on-line particle size analyzers, sampling systems and process instrumentation Outotec Proscon and Outotec ACT plant automation and reporting systems

4 006 Outotec Gold Processing Solutions Outotec Gold Processing Solutions 007 Gold ore pre-treatment In refractory ores, gold is locked within sulfide minerals under high temperature and pressure using gaseous making these ores not amenable to conventional oxygen liberating gold for leaching and recovery. cyanide leaching without pre-treatment. Outotec Oxygen is a key operating expenditure in the POX plant offers two proven pre-treatment options, pressure and Outotec's autoclave mixing technology enables oxidation and roasting, to convert the refractory or efficient use of oxygen with superior gas-liquid mass double refractory ores into easily and effectively transfer. Outotec's autoclave train package includes leachable form. all main and auxiliary equipment from autoclave feed tanks to flash tanks. Pressure oxidation Outotec supplies process technology and equipment for all process steps in a pressure oxidation (POX) circuit with a high level of automation and process control to optimize plant performance. A typical POX circuit consists of the following main process steps: carbonate removal, chloride removal, pressure oxidation, gas scrubbing, conditioning, solid-liquid separation and neutralization. Outotec's technology packages are delivered as complete functional units integrated into the processing plant. OKTOP Pressure Equipment The autoclave is the heart of the POX circuit. In the autoclave the sulfide mineral matrix is decomposed OKTOP Reactors for carbonate removal, conditioning and neutralization OKTOP Reactors are designed using a modular approach. A combination of process, automation and equipment know-how results in minimum lifetime operating costs. This approach provides proven reactor solutions with optimal metallurgical results, availability and fast track delivery and ramp-up. Outotec Larox Filtration Plant for effective chloride washing The Outotec Larox filtration plant enables maximum chloride washing efficiency with minimum water consumption in applications where chlorides have a negative impact on gold recovery. Outotec Thickeners for counter-current decantation The Outotec High Rate Thickener has pioneered thickening and clarifying methods around the world and provides a robust and low-cost solution for countercurrent decantation of the oxidized slurry. Outotec Vent Gas Scrubbers Outotec's vent gas cleaning technology meets the toughest environmental regulations and captures harmful components from all autoclave exhaust gases. Reduced Risk: One stop shop from laboratory to operations Process guarantees Fast supply and installation due to modular design Lifetime partnership Gold roasting Outotec is capable of providing complete process solutions for the roasting process with in-house technology for fluidized beds, heat recovery, gas cleaning, sulfuric acid and effluent treatment plants. Fluidized bed roasting is a proven technology with many references covering a wide spectrum of process scenarios. The roasting process for both whole ore and concentrate adds significant benefits to downstream processing. In roasting, elements posing problems in the leach recovery of gold are either oxidized, including carbon, sulfur, arsenic and antimony, or volatized as in the case with mercury, chlorides and telluride. The roasting process is autothermal, but additional heating is needed for ores with low sulfur and carbon content. The sulfur dioxide created during roasting is further processed from the process gas to sulfuric acid. Offgas impurities are removed in special gas cleaning steps and hazardous materials are further processed to concentrated products with high stability. Double refractory materials containing both sulfide minerals and organic carbon are especially suitable for roasting. The roasting process can be made in one or two steps depending on the concentrate or ore composition. The use of circulating fluidized bed "CFB" technology for roasting assures that the narrow temperature operation window required for the gold roasting process can be reached. In the case where arsenic or antimony is contained within the concentrate, partial roasting or two stage roasting is realized and arsenic is removed from the solid phase and transferred to the gas phase. Outotec has over 60 years experience in commercialized fluidized bed plants with hundreds of references. Outotec offers well-proven and efficient complete roasting plant solutions including roasting, dedusting, calcine cooling, gas cleaning, effluent treatment and sulfuric acid. Our offering covers everything from laboratory testing to turnkey deliveries and life cycle services. Outotec equipment offering for roasting: Outotec FB Roasters Outotec CFB Roasters and pre-heaters Outotec Dearsenifying Roasters Waste Heat Recovery systems Outotec Hot Gas Cleaning systems Outotec Wet Gas Cleaning systems Outotec Sulfuric Acid Plant Other key processes and equipment Process automation, instrumentation

5 008 Outotec Gold Processing Solutions Outotec Gold Processing Solutions 009 Iovative cyanide-free gold recovery Outotec s on going proactive development work on novel cyanide-free gold leaching and recovery technology is one example of our sustainable thinking. Based on extensive know-how in chloride leaching, Outotec has developed a new environmentally friendly chloride leaching process for gold ores and concentrates. The new process combines effective gold leaching with a new type of gold solvent extraction process. Highly oxidizing power in gold leaching provides very fast leaching kinetics and excellent gold recovery. Gold can be extracted from pregnant leach solutions using an Outotec's patented solvent extractant. Pure gold product is precipitated directly from the stripping solution. Solvent extraction technology enables also direct silver recovery. Gold leaching and recovery Following pre-treatment by pressure oxidation or roasting, Outotec can provide both carbon-in-pulp (CIP) and carbon-in-leach (CIL) plants, as well as elution and gold recovery technologies as an integrated gold production solution. Our technology portfolio covers cyanide detoxification and tailings disposal. Using inhouse know-how and specialized partners, our services begin with test work enabling delivery of an optimized plant with process guarantees. With a total gold solution from one supplier you will minimize the risks relating to your project and operations. Gold cyanide leaching and recovery plant Gold leaching is carried out in dilute alkaline cyanide solution in agitated reactors. Highly efficient OKTOP Reactors focus on minimizing carbon attrition and maximizing gold recovery. Outotec takes the agitator and reactor solutions to a new level of pre-designed leaching plant modules improving the efficiency and quality of the customer's project implementation. Outotec equipment for gold cyanide leaching and recovery: OKTOP Reactors and pre-designed Outotec Leaching Plant modules for cyanide leaching Elution plant and gold room Cyanide Destruction plant Outotec Thickeners and paste thickeners Outotec Courier on-stream XRF analyzers, sampling systems and process instrumentation Outotec Proscon and Outotec ACT plant automation and reporting systems

6 010 Outotec Gold Processing Solutions Outotec Gold Processing Solutions 011 Tailings and effluent treatment The effective recovery of gold with minimal water Effluent treatment and energy consumption and sustainable disposal of residues is one of the most challenging issues in Outotec provides tailored water treatment solutions the gold processing industry. Outotec s expertise and to produce water that meet environmental discharge capability to optimize the total gold production chain concepts and maximize water recycling for reuse, includes competitive solutions for water and tailings while enabling the recovery of valuable elements and management. Outotec offers proven tailings thickening reducing water and energy consumption. and filtration equipment and effluent treatment solutions for water discharges. With a long tradition in applying and investigating water treatment processes for gold plants, Outotec Tailings treatment offers efficient, sustainable and best available process solutions and technologies for the treatment of process From conventional to Outotec paste, thickening and waste water. technology is a modern way to handle and store tailings from gold operations in a more environmentally Outotec equipment for effluent treatment plant: sustainable way. Compared to traditional dumping, tailings coming from paste thickening contains less water enabling an improved water balance. Outotec has also developed novel filtration solutions for tailings to further improve water re-usage and minimize the tailings disposal area. OKTOP Reactors Outotec Thickeners Outotec Larox Filters Outotec Larox Filtration Plant Outotec VentGas Scrubbers Outotec Courier on-stream XRF analyzers, Outotec gold technologies : Gold ore beneficiation Comminution Flotation Thickening and clarification Gold leaching and recovery Gold cyanide leaching (CIL and CIP) Gold chloride leaching Elution and gold recovery Gold solvent extraction Gold precipitation technologies sampling systems and process instrumentation Filtration After paste thickening, Outotec offers both landfill and backfill solutions for tailings disposal. Our backfill technology allows paste to be stored in the mine either stabilized or dry. Our landfill technology enables stable above ground storage of tailings. Outotec equipment for tailings treatment plant: Outotec Thickeners and paste thickeners Outotec Larox Filters Outotec paste plant Mine backfill and landfill plants Outotec Proscon and Outotec ACT plant automation and reporting systems Pressure oxidation Carbonate removal Chloride removal Pressure oxidation Gas scrubbing Conditioning Gas cleaning Arsenic removal Neutralization Gold roasting Tailings and effluent treatment Paste thickening Paste filtration Backfill and landfill technologies Precipitation and ettringite precipitation technologies for enhanced sulfate and arsenic removal Cyanide detoxification Analyzers and automation Process automation and advanced process control Bubbling and circulating fluidized bed roasting On-line particle size analyzers On-line elemental analyzers Two stage dearsenifying roasting Image analysis systems Heat recovery system Fluidized bed cooling Sampling systems for metallurgical balance accounting Wet gas cleaning Reporting systems Sulfuric acid technologies Carbon removal Services Sulfide removal Arsenic removal Training, commissioning and start-up services Halogen removal Operation and maintenance services Spare parts Plant audits, retrofits and equipment upgrades