Annual Meeting Preliminary Program - Full Brochure (PDF) - SME

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wednesday, february 27 afternoon Bulk Material Handling by Conveyor Belt 7: Case Studies of Large Belt Conveyance Projects Part II 9:00 AM • Tuesday, February 26 Chair: E. Brady, Twentymile Coal Co., Oak Creek, CO 9:05 AM CADMAN Overland Conveyor P. Sehl 1 , W. Sayer 2 and M. Mendez 1 ; 1 ThyssenKrupp Robins inc, Greenwood Village, CO and 2 Cadman, Inc, Redmond, WA The new Cadman Overland Conveyor transports pit run from an upper mining area in North Bend, WA, downhill to a lower pit. The conveyor belt has a rated capacity of 1,000 stph, is 1.2 miles long and an elevation drop of 900 ft. The design includes provisions for transporting material uphill. The regenerative energy produced by the loaded conveyor is used to offset the power consumptions of the crusher and feed systems. The project team was faced with the challenge of building a conveyor that follows a complex route and maintains a “low–profile” design, which is minimally obtrusive to the environment. 9:35 AM Replacing the Long Distance Pipe Conveyor Belt at Western Arch Coal Skyline Mine M. Keller; ContiTech, Northeim, Germany Located approx. 3500 m above sea level the Arch Western Coal Skyline Mine Pipe Conveyor in Utah has a centre distance of 3414 m and an elevation drop of 172 m. It transports coal at approx. 1200 tph downhill from the pit to the mine’s train loading facilities. In 2006, after 13 years of service, the replacement of the initially installed belt had become inevitable. The turnkey project to the customer covered both the design and supply of the pipe conveyor belt as well as the procedures for the actual carry-out of the belt installation and commissioning. With its 22 horizontal and 45 vertical curves the conveyor system follows the natural geographical contour in order to minimize the conveyors impact to the environment. Therefore the biggest constraints for the project were to ensure the new pipe conveyor belt being accepted by the existing structure as well as minimizing the inevitable downtime during belt installation and commissioning and therefore to avoid a potential loss of production. 10:05 AM Large-scale Stacking System at the Phelps Dodge Safford Mine M. Schmalzel 1 , A. Osterloh 2 and G. Graber 3 ; 1 Phelps Dodge, Safford, AZ; 2 Fluor Canada Ltd, Vancouver, BC, Canada and 3 Terra Nova Technologies, Santee, CA Freeport-McMoRan Copper & Gold, Inc., will begin copper production from the Dos Pobres and San Juan deposits near Safford, Arizona. Ore reserves total 615 M tons grading 0.36% copper, predominantly as chrysocolla. Copper extraction will be by leaching with sulfuric acid. Fluor Canada Ltd. provided EPCM services to design an ore handling and conventional SX/EW facility capable of producing a nominal 240 million pounds per year of cathode copper. The ore handling facility will process 114,000 tons per day of ore through three-stage, open-circuit crushing followed by agglomeration and product placement on the permanent leach pad. Stacking of ore on the leach pad will utilize Terra Nova Technologies’ “Super Portable” mobile stacking system, comprising a fleet of (13) self-propelled, crawler-mounted, 72”- wide, 6,800 ton/hour mobile conveyor units, including (10) 250-ft-long portable conveyors, a 300-ft-long horizontal conveyor and a 220-ft-long radial stacker. 10:35 AM Thirty-Year Old Transfer Point Challenge R. McEwen; Drummond Equipment Co, Mississauga, ON, Canada Conveyor equipment beyond its prime chronically suffers from lack of understanding in today’s plant environment regularly delivers more material than original designers ever expected. A case in point is a belt conveyor in a major hard rock mine/milling operation asking to bring the unit up to current standards while eliminating spillage and reducing airborne dust. The challenge was to keep the system going by revamping the system while keeping the same footprint and allowing for higher production rate. Thirty years of daily maintenance and dust collection costs have virtually disappeared by the end of this challenging upgrade. Chair: Environmental: Water Management: The Environmental Challenges of Too Much or Too Little 2:00 PM • Wednesday, February 27 P. Gorman, URS Corporation, Tucson, AZ 2:05 PM Post-Closure Flooding of the Homestake Mine at Lead, South Dakota A. Davis 1 , W. Roggenthen 2 , L. Stetler 3 , Z. Hladysz 4 and C. Johnson 5 ; 1 Geology and Geological Engineering, South Dakota School of Mines and Technology, Rapid City, SD; 2 Geology and Geological Engineering, South Dakota School of Mines and Technology, Rapid City, SD; 3 Geology and Geological Engineering, South Dakota School of Mines and Technology, Rapid City, SD; 4 Mining Engineering and Management, South Dakota School of Mines and Technology, Rapid City, SD and 5 RESPEC, Inc., Rapid City, SD The historic Homestake gold mine at Lead, South Dakota, was closed in December of 2001, after 125 years of operation. Since closure, the mine has been selected by the National Science Foundation as the host site for the Deep Underground Science and Engineering Laboratory. Pumps in the 8000- ft deep mine were shut off on June 10, 2003. Post-closure flooding of the mine has resulted in rising water levels that reached the 5000-ft level in July of 2007. The rate of water inflow into the mine is about 700 gal/min. A plot of water level vs. time shows that the rise has not followed an exponential decay curve. When the pumps are turned on for dewatering, the rate of water-level decline will be monitored. Water in the Homestake mine contains arsenic that results from arsenopyrite. In samples of pumped water, the mean concentration of arsenic was below the surface-water aquatic life standard for beneficial use. 2:25 PM Determination of Surface Hydrologic Consequences for the Extension of a Western Semi-arid Surface Coal Mine S. Raugust 1 , B. Brock 1 , F. Lan 2 and C. Brown 3 ; 1 URS Corporation, Albuquerque, NM; 2 URS Corporation, Denver, CO and 3 BHP Navajo Coal Company, Fruitland, NM Office of Surface Mining mandated permit application for any proposed coal mine operation has two crucial components, i.e. baseline hydrologic information and probable hydrologic consequences (PHC). This paper presents the methodologies for the baseline surface hydrologic study and surface PHC evaluation for a mine extension project in a western semi-arid surface coal mine operated by BHP Navajo Coal Company. The new project will receive hauled back coal combustion byproducts (CCBs) for placement in new pits and a major arroyo will have to be diverted. Finally, the mine is to be reclaimed using a geomorphic reclamation approach. The study will begin with a baseline channel inventory of all surface water bodies, followed by determination of pre-mining/mining/post-mining hydrology and sedimentation using analytical tools. Based on the results obtained, the probable impacts of mining, CCB disposal, arroyo diversion and reclamation on surface water resources will be evaluated. Any changes in stream flow, sedimentology and water quality of the arroyos will be predicted. Finally, changes in erosion and sediment yields from disturbed and reclaimed areas will be assessed. 2:45 PM Managing precipitation events on reclaimed mining lands in the arid Four Corners Region – facilitating infiltration while controlling runoff D. Place; San Juan Coal Company, BHP Billiton, Waterflow, NM San Juan Coal Company’s La Plata and San Juan surface mines are located in the arid Four Corners Region in New Mexico. Although only about 20 miles apart there is quite a difference in average annual precipitation with La Plata Mine receiving about 12 inches and San Juan Mine receiving about 7 inches. The majority of the precipitation falls as rain between July and October during intense thunderstorms. The remainder falls as snow or short duration showers. The reclaimed lands must be able to capitalize on these showers by facilitating infiltration while controlling the runoff created during the intense events. This presentation discusses ways in which those two different goals are met and shows how the reclaimed lands stood up to a recent 200 year storm event that produced over 2 inches of rain in less than 3 hours. 58
Mineral & Metallurgical Processing: Mineralogy of New Ore Reserves as it Applies to Processing 2:00 PM • Wednesday, February 27 Chairs: A. Hagni, Intellection Corporation, Rolla, MO P. Miranda, Montana Tech, Butte, MT 2:05 PM Refractory Copper Ore from Nchanga, Zambia: A Materials Characterization Study A. Hagni 2 , O. Sikazwe 1 and R. Hagni 3 ; 1 Geology, University of Zambia, Lusaka, Zambia; 2 Intellection Corporation, Rolla, MO and 3 Geological Sciences and Engineering, University of Missouri-Rolla, Rolla, MO The Nchanga Cu-Co ore deposit of the Zambian Copperbelt, is hosted in the Neoproterozoic siliciclastic-carbonate sedimentary rocks, and consists of two orebodies: the Lower Orebody (shale) and the Upper Orebody (arkose). Refractory Cu ores present in the Upper Orebody comprise 150 Mt with avaerage 0.87% Cu, and are characterized by inadequate recovery of copper by leaching. This materials characterization study, conducted on refractory ore samples from the Upper Orebody using optical, QEMSCAN, and microprobe, has shown that copper occurs mainly in biotite-phlogopite, malachite, pseudo-malachite and goethite. QEMSCAN has quantified the abaundance of phases and total Cu in each phase. 2:25 PM Geology and Mineralogy of REE-bearing breccia pipes, Pea Ridge Mine, Missouri C. Seeger; Missouri Geologic Survey <strong>Program</strong>, Rolla, MO The Pea Ridge Mine contains four REE-bearing breccia pipes located near contacts between major lithologic zones. The pipes contain rhyolite, hematite, and silicified rock clasts in a groundmass of rock flour, feldspar, chlorite, barite, apatite, monazite, quartz, and calcite. REE-bearing minerals include monazite, xenotime, and rare bastnaesite and britholite. Thorium and uranium are present in the groundmass. Bulk samples have average REO concentrations of 12 weight percent; grab samples are as high as 37.8 weight percent. Cerium, lanthanum, and yttrium are present in recoverable quantities. Estimated reserves are 180,000 tonnes of 12% REO. 2:45 PM Head Grade Effects on Gold Recovery M. Brittan; Gold Fields, Denver, CO The occlusion of unliberated gold particles in silicates and sulfides in crushed/milled ore dictates the recovery that can be expected. The grade of this occluded gold in cyanide leach residues shows a consistent, general relationship to the head grade of the ore, irrespective of mineralogy or geographical location. The residue grade almost invariably increases with the head grade, but not in proportion to it. This phenomenon appears to stem from the nature of the geological events originally responsible for creating the ore deposits. A statistically-based technique for determining the true head grade-tail grade relationship from gold plant operating data is described. The effect is illustrated with results from several worldwide gold milling operations analyzed over the last 35 years. 3:05 PM The Sulphide Mineral Assemblages and <strong>Preliminary</strong> Metallurgical Characterization at the Pebble Porphyry Deposits, Alaska S. Freudigmann 1 , B. Fielder 2 , D. Barratt 3 and R. Schafer 1 ; 1 HunterDickinson Inc., Vancouver, BC, Canada; 2 Melis Engineering Ltd., Saskatoon, SK, Canada and 3 DJB Consultants Inc., Vancouver, BC, Canada Northern Dynasty Mines Inc. is preparing development plans for the Pebble Project in Alaska, about 200 miles (320 kms) southwest of Anchorage. The property hosts significant copper-gold-molybdenum porphyry deposits that have been delineated by substantial exploration drilling since the initial discovery of Pebble West in 1988. In 2005 exploration drilling revealed the presence of a large, higher-grade Cu-Au-Mo deposit, ultimately designated Pebble East, at the east end of the then-known resource beneath younger volcanic cover rocks. The lithology, mineralogy and alteration of the deposits are being correlated to the metallurgical trends observed. Both deposits have been the subject of extensive metallurgical testwork, which has developed preliminary process flow sheets. Factors such as grind size versus recovery, flotation reagents, flotation pH and gold recovery techniques have been assessed and optimisation and variability work continues. A significant comminution testwork program has been conducted in parallel with flotation. An innovative approach is being used to incorporate these data into the feasibility plan. 3:25 PM MLA: Current Projects and New Ore Reserve Mineralogy at the Center for Advanced Mineral and Metallurgical Processing P. Miranda and C. Anderson; Montana Tech/CAMP, Butte, MT The Center for Advanced Mineral and Metallurgical Processing (CAMP) has obtained a Mineral Liberation Analyzer (MLA) and successfully evaluated over 30 projects using this new technology. CAMP has utilized the technology for several projects with some surprising results. The MLA is able to both analyze and quantify minerals and phases. For this presentation, current CAMP projects have been evaluated and data collected using the MLA. These projects include Platinum Group Metal (PGMs) refinery evaluation from a mine located in Montana. Secondly, a copper molybdenum mine process evaluation with surprising results was evaluated. Next, a potential gold and PGM tailings pile was considered using the technology. A uranium deposit was evaluated and finally, a Canadian copper mine with native copper and gold was reviewed for potential improvements. For all projects, MLA application results will be presented and discussed. 3:45 PM Peñasquito, Mexico - Exploration of a Giant Diatreme-hosted Au-Ag- Zn-Pb Deposit G. Brown; Exploration, Goldcorp, Inc., Zacatecas, Mexico Peñasquito is a world-class Au-Ag-Zn-Pb deposit centered on two diatremes cutting Cretaceous clastic units above an Eocene-Oligocene intrusive complex. Its discovery under post-mineral Quaternary alluvium in the Concepcion del Oro District of northern Zacatecas state is a testimonial to perseverance during more than a decade of exploration. Disseminated and lesser fracture-controlled sphalerite, galena, various silver sulfosalts, and electrum are hosted by milled-clast breccias within the diatremes and by clastic units in the surrounding mineralized halo. Proven and probable open pit reserves of 917.5 million metric tonnes (Mt) of ore containing 13.0 Moz Au, 864 Moz Ag, 5.81 Mt Zn, and 2.67 Mt Pb continue to increase with additional exploration and drilling. Alteration and mineral zoning suggest these reserves represent distal mineralization related to an underlying porphyry system. 4:05 PM MLA: Current Projects at the Center for Advanced Mineral and Metallurgical Processing P. Miranda and C. Anderson; Montana Tech, Butte, MT The Center for Advanced Mineral and Metallurgical Processing (CAMP) has recently obtained a Mineral Liberation Analyzer (MLA) and has currently evaluated over 15 projects using this new technology. CAMP has utilized the technology for several projects with excellent results. The MLA is able to both analyze and quantify minerals and phases. For this presentation, current CAMP projects have been evaluated and data collected using the MLA. These projects include Platinum Group Metal (PGMs) refiner evaluation from a mine located in Montana. Secondly, a copper molybdenum mine process evaluation with surprising results was evaluated. Next, a potential gold and PGM tailings pile was considered using the technology. Finally, a Canadian copper mine with native copper and gold was reviewed for potential improvements. For all projects, MLA application results will be presented and discussed. Mineral and Metallurgical Processing: New Reagents and Technology 2:00 PM • Wednesday, February 27 Chair: D. Nagaraj, Cytec Industries Inc, Stamford, CT 2:05 PM An overview of fine particles (slimes) in flotation A. Gorken; Mining, Cytec Industries Inc., Stamford, CT Effects of very fine particles (slimes) occurring mostly in the form of clay minerals has been so strong that it was recognized even in the early stages of flotation development. Numerous researchers have studied this phenomenon in great details from mineralogical, chemical and equipment points of views. 59
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SME Annual Meeting & Exhibit NEW HO
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How to Register Register by January
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Conference Registration Includes: f
Page 7 and 8: keynote The Mineral Supercycle: Pas
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