Engineering & Mining Journal

AUG 2017

Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr

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Page 91 of 99

90 E&MJ • AUGUST 2017 PROCESSING SOLUTIONS The demonstration system can pro- cess up to 170 kilograms/h of magnetite but Kelsey plans to upscale the system to a commercial level. The technology, which is claimed to have received signifi cant global interest, will continue to be developed in South Australia. Technology May Eliminate Slurry Tailings Dams FLSmidth recently announced it will join with Goldcorp to develop EcoTails, a new system the company said is intended to dramatically improve tailings and waste rock disposal while economically pro- cessing mine waste and increasing water recovery and reuse by as much as 95%. Together with Goldcorp, the world's third largest gold miner, FLSmidth is co-developing a system for co-mingling dewatered tailings with waste rock in a continuous process. Designed specifi - cally for large-scale mining applications, the system is expected to be environ- mentally safer for managing tailings and waste rock storage and has the potential to eliminate conventional slurry tailings dams completely. Combined with FLS- midth's co-developed fi lter press dewater- ing technology, co-mingling is described as the missing piece of the puzzle to keep costs low for dry stacked tailings. "As water resources become increas- ingly scarce and mining dams grow glob- ally, so do the risks," said Todd Wisdom, director of tailings systems, FLSmidth. "We believe that the target for the in- dustry is to completely eliminate tailings dams, and to recirculate maximum water back to the process. Highly dewatered tailings is the sustainable route for tail- ings disposal, and our work with Goldcorp will help EcoTails develop into both a technologically viable and economically feasible solution for large-scale mining." The solution is being studied for full-scale testing at Peñasquito, Gold- corp's largest mine, with an average dai- ly throughput of 130,000 tons per day. Co-mingled waste disposal has previously only been used at small-scale mines us- ing dozers, trucks, high-cost liquid-solid separation processes, and signifi cant manpower, making the solution too costly for large-tonnage operations. By using materials conveyance as the energy source for the mixing, Goldcorp and FLSmidth said they are testing a low-energy, low-cost co-mingling solu- tion, with the waste blended in transit using specially designed material han- dling technologies. This method, ac- cording to the companies, will make the solution economically competitive with traditional tailings disposal methods for large mines. Co-mingling tailings with mine waste in a continuous process produces a new type of waste called GeoWaste. The fi l- tered tailings cost is minimized by using fast fi ltering technology and waste rock to provide additional strength to the blended material. The risk of acid rock leaching from the waste rock is mini- mized by the use of fi lter cake to fi ll the voids of the waste rock matrix, greatly re- ducing oxygen fl ux. The system will be offered commer- cially by FLSmidth following completion of testing. Our Experience for Your Individual Solution Hermann Paus Maschinenfabrik GmbH Siemensstr. 1-9, 48488 Emsbueren/Germany Scaler Utility Vehicles LHD Loaders Dump Trucks Road Maintenance Coal Mining Access Technology

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