Dagbrottsdesign med IPCC
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Mager is a fictitious mining project and preliminary feasibility studies show a positive result. The study was done with respect to regular open pit mining and Boliden wants to see if the project can be strengthening economically with the mining method “fully mobile In-Pit Crushing and Conveying” (IPCC). IPCC consists of a crusher and a conveyor and the idea behind IPCC is to minimize the lead time between excavator and crusher by placing the crusher inside the open pit. There are three different types of IPCC-systems; Stationary-, Semi-stationary- and Fully Mobile IPCC. Stationary- and Semi-stationary IPCC still utilize trucks but the lead time is minimized by placing the crusher somewhere inside the open pit at an arbitrary distance from the mining face. With Fully Mobile IPCC the ore is directly loaded into the crusher by the excavator and therefore eliminates the need for trucks. Fully Mobile IPCC is a standalone crusher equipped with crawlers, which enables it to continuously follow the excavator at the mining face. The optimization is done in Whittle, which uses the Lerchs-grossman method. The ore is mined with IPCC while the waste is handled with trucks. The mining cost for ore is 11 Sek/t with increment of 0.011 Sek/t per vertically mined meter and cost for waste is 14 Sek/t with an increment of 0.029 Sek/t. The investment cost is estimated to be 12,000 MSek. The optimization resulted in four open-pit shells and has a south-west directional spread. The eastern wall is kept constant during the entire life of mine. The slopes is kept as straight as possible to maximize the span of the conveyors and minimize unnecessary transfer-points. There will be two conveyors in production and they will be located at the north wall and at the west wall. The Optimization of Mager shows a positive net present value of approximate 4,400 MSek. The final size of the open pit is 2.1 km in northwest direction and 2.1 km in south direction. The open pit is mined with four pushback. The mine is located at a small mountain, and has its peak located at +390 m. Initial mining will be done by semi-stationary IPCC where the mobile crushers acts like an ordinary crusher and placed somewhere in the mine. When the level +300 is reached, the mining will switch to fully mobile. Pushback one levels the mountain down to +300 and continuous down to +15. All remaining pushbacks start at +300 and pushback two ends at -90m. Pushback three ends at -105 and the final pushback stretches down to -135 m. The walls are kept as straight as possible in order to maximize the span of the conveyors, which eliminates unnecessary transfer points. During production, two conveyor belts will be used and they are located at the north wall and the eastern wall. The cash flow analysis over Mager shows an accumulated cash flow of 40,000 MSek and a payback time of 10 years. The net present value is approximate 350 Msek. With the given conditions Mager is deemed to be a viable project.
Place, publisher, year, edition, pages
2015. , 59 p.
Teknik, Dagbrottsdesign, IPCC, In pit crushing and conveying
IdentifiersURN: urn:nbn:se:ltu:diva-56109Local ID: ce9c2331-bfe6-464f-bf7a-866246a145dbOAI: oai:DiVA.org:ltu-56109DiVA: diva2:1029495
Subject / course
Student thesis, at least 30 credits
Civil Engineering, master's level
Validerat; 20141013 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved