«Mekhanobr Engineering» JSC (Russia):

Baranov V. F., Deputy General Director for Prospective Projects, Doctor of Engineering, office@mekhanobr.spb.ru 

Main production equipment and design-and-spatial-layout solutions of the newest copper and coppergold operating, as well as being at design stage, concentrating plants' ore-preparation circuits, applying two competitive methods of ore-preparation: ore semiautogenous grinding (SAG) and grinding by high-pressure grinding rolls (HPGR), are considered. An important specialty of foreign concentrating plants' spatial-layout solutions with SAG being applied to mono ores — designing ore-preparation circuit as a mono section for capacities up to 36 million tons of ore per year, is shown up. In design of spatial-layout solutions for concentrating plants with HPGR, foreign engineering com panies seek to reduce costs of ore-preparation circuits through minimization of transport facilities length, as well as capacities of ore storages and bins, and also by means of applying blocking solutions and concepts. A detailed comparison of the two methods of ore-preparation by power consumption was carried out. Simultaneously, the start-up problems of ore-dressing facilities and ways of their solution are elucidated. Recommendations are given with regard to most rational spatial-layout solutions application in design practice, as well as to working out actions with a view to achieve designed throughput capacity of ore-preparation circuits during start-up period, in the cases when supplied feed material is stronger, than planned.

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2. Orser T., Svalbonas V., Van de Vijfeijken M. Conga: the world's first 42 foot diameter 28 MW gearless SAG mill. Conf. SAG—2011, Vancouver, Canada, Sept. 2011.
3. Shuey S. Mill technology: New generations and the rein vented standby. Engineering and Mining Journal. 2002. May. 
4. Fluor Corp. Bozshchakol Project. Expanded variant. Report on the Prefeasibility Study. Oct. 2009.
5. TeckCominco. Petaquilla Project. Vol. II. Dec. 2006. Cost update.
6. FLSmidth to supply world's largest mineral mills and cone crushers. Company Announcement No. 062008.
7. Building the future today at OyuTolgoi Integrated Development Plan 2010. Presentation.
8. Goldcorp Inc. Penasquito Project Technical Report. March 2009. 
9. Putland B. Comminution circuit selection — key drivers and circuit limitations. Conf. SAG—2006. Vancouver, Canada.
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11. Klymowsky R. How have HPGRs fared in the current financial crisis? Procemin—2009. Santiago, Chile, Dec. 2009.
12. Pacific Booker Minerals Inc. Morrison Project HPGR Tradeoff Study Document No. 0652720100REPR000402. Wardrop, May 2008.
13. Adanac Molybdenum Corp. Management presentation. Oct. 2008.
14. Spinifex Ridge Molybdenum Deposit Western Australia NI 43101 Updated Technical Report. Aug. 25, 2009. Moly Mines Ltd.
15. Ajax Copper/Gold Project — Kamloops, British Columbia Feasibility Study Technical Report. Document No. 1054610300REPR000402 . Wardrop. Jan. 6, 2012.
16. NI 43101 Technical Report on the Prefeasibility Study of the Kemag Iron Ore Project, Quebec for New Millennium Capital Corp. Montreal, Canada, March 2, 2009.