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Follow on Google News | Sand River Stone Mining Equipment Crusher Griniding Mill MachinesTara lead and zinc mine is located at Navan, County Meath, approximately 50km northwest of Dublin. The mine opened in 1977, was acquired by Outokumpu in 1986 and in January 2004 was transferred to New Boliden as part of an asset exchange between
By: ray chang sand river stone crushing GEOLOGY AND RESERVES The Navan orebody consists of several strata-bound, southwest-dipping, faulted lenses hosted in Lower Carboniferous limestones. Ore horizons commonly display irregular assay outlines and vary from a few metres thick to several tens of metres. As of January 2006, reserves were 3.4Mt at 9.2% zinc and 2.0% lead proven and 12.3Mt probable with 8.5% Zn and 1.8% Pb. Measured resources totalled 1.1Mt. grading 7.1% Zn and 2.8% Pb. In addition, the Nevinstown (Bula) orebody, northwest of Tara, contains 8Mt grading 10% Zn and 2% Pb, raising the overall resource to approximately 40Mt. Boliden expects further exploration to raise ore tonnage sufficiently to guarantee a mine life of ten years. UNDERGROUND MINING Tara uses underground trackless mining, supported by one production and one service shaft, and an access decline from surface. The use of specifically tailored, state-of-the- Mining methods have varied in the past but, currently, variations of blast hole open stoping with drawpoints located in footwall ore are used and involve substantial use of remote-controlled Tamrock (now Sandvik) load-haul-dump (LHD) equipment. Pillar extraction is usually carried out using similar methods between cemented, hydraulically placed fill walls consisting of mill tailings. Tamrock 50D trucks are used for ore haulage underground with Normet utility vehicles, and New Boliden has also recently begun introducing some Atlas Copco equipment. Communications underground are provided by a Motorola mobile radio system. "Boliden expects further exploration to raise ore tonnage sufficiently to guarantee a mine life of ten years." Production is currently targeted from 60 stopes/pillars with a lateral development schedule of 15km/y. Approximately 1.3Mt/y of backfill are placed. Over the last few years Tara has moved into areas of much lower average thickness (3–20m). If the ore is thick, blind upholes are used and the stope mined from the footwall drift, with inclined room-and-pillar and/or longitudinal longhole stoping used in thinner areas. sand making process ORE PROCESSING Four underground crushers are equipped with a hydraulic rockbreaker over a crusher pocket. One operator controls and monitors the operation of the crushers, together with the associated conveyors, the tramp metal magnet and conveyor transfer points. On surface, run-of-mine ore is fed to the secondary and tertiary crushers, then ground by open-circuit rod milling followed by closed-circuit ball milling. The ground product passes to flotation circuits for lead recovery, followed by zinc. The flotation circuit includes 18 Outomec OK-38 and eleven OK-8 cells. Each concentrate is dewatered by thickening and subsequent vacuum filtration. The filter cakes are dried in oil-fired rotary drum dryers to reduce moisture content to levels suitable for shipment. http://www.rockscrusher.com/ http://www.rockscrusher.com/ http://www.rockscrusher.com/ # # # We main products is stone crusher,jaw crusher,cone crusher impact crusher,grinding mill,raymond mill,vertical roller mill,ball mill. End
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