Euro Sun Mining Inc., reports that the feasibility-level metallurgical testing contract for its Rovina Valley Gold and Copper Project has been awarded to Eriez Flotation Division, USA ("Eriez"). SRK Consulting (Canada) Inc will oversee the metallurgical test program at Eriez as part of the Bankable Feasibility Study.
The test work will follow on the previous metallurgical results released in April 2017 (see press release dated April 26, 2017).
G. Scott Moore, President and CEO of Euro Sun Mining, commented, "The feasibility level metallurgical test work will follow on and confirm the outstanding results reported in April of 2017, wherein gold recoveries increased to 82% and copper to 88% in a 21% copper concentrate, all without the use of cyanide."
The metallurgical test work is to employ column flotation technology to investigate the optimal grade and recovery relationship for copper and gold within both the Colnic and Rovina geo-metallurgical domains. A copper concentrate grade of 18-20% is targeted for treatment of all ores. Coarse flotation using the Eriez HydroFloatTM will also be investigated in an effort to minimize the grinding requirements and maximize rejection of coarse clean tailings.
A total of four feed samples spanning four geo-metallurgical domains, three Colnic and one Rovina, will be provided by Euro Sun Mining. Samples are expected to arrive as core (3,000 kg per sample); therefore crushing, classification, and milling will precede all flotation testing. Following identification of the most optimal rougher flotation feed grind size via mechanical flotation tests, samples will be bulk milled to the appropriate P80 size and subjected to rougher-scavenger column flotation in series. Following primary column flotation optimization and treatment of each bulk sample, secondary grinding studies will be conducted on rougher-scavenger concentrates to determine grinding times necessary to achieve P80 grind sizes of 38 and 25 µm. Locked cycle, or closed circuit, cleaner flotation testing will be performed using Eriez' automated multi-stage column flotation circuit.
The laboratory-scale columns will be run with automatic level control and include the proprietary Cavitation-Tube sparging technology. The high collision rates afforded by the Cavitation-Tube sparging system ensure excellent recovery of fine and ultra-fine material. In addition, the use of wash water is expected to improve flotation grade by limiting entrainment.