Gan Samaradivakara (2010). MINING OF SHALLOW WATER COASTAL MINERAL SAND DEPOSITS: DREDGE MINE RECONCILIATION PhD Thesis, School of Mechanical and Mining Engineering, The University of Queensland.

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Author Gan Samaradivakara
School, Centre or Institute School of Mechanical and Mining Engineering
Institution The University of Queensland
Publication date 2010-03
Thesis type PhD Thesis
Supervisor Dr. Mehmet Kizil
Professor Peter Knights
Total pages 17+ 205 = 222
Total colour pages 55
Total black and white pages 167
Subjects 09 Engineering
Abstract/Summary Heavy mineral deposits such as rutile, ilmenite, zircon and monazite are of placer origin, and are mostly found as either beach or dune sand deposits. Dredge mining has been used to exploit such deposits over the decades as it is the most economical and feasible mining method applicable for such mineral accumulations throughout the world. Dune sand deposits are mined by means of suction cutter or bucket wheel dredgers operating in artificial channels or ponds when sufficient water is available. The sluicing is often used to control the stability of earthen slopes, while facilitating the dredging operation. The dredged material is pumped to a floating concentrator via a float line for the initial separation. Even though the sluicing process is essential and favourable for such a dredge mining operation, it complicates the task of the dredge mine reconciliation. This research aims to investigate all possible factors that affect dredge mine reconciliation discrepancies and to develop an enhanced dredge mine reconciliation model, with the aid of sonar and laser profiling technologies in conjunction with sampling and testing of heavy minerals. The variation of material on the workface up to the water level is monitored by conducting workface surveys using laser profiling technology. The movement and accumulation of material underwater is monitored by conducting sonar soundings, and the dredge retreat programs are planned accordingly. Production by the dredger is recorded online as the dredger throughput. This process is used to reconcile the dredged material quantitatively. In addition, sampling of material upstream and downstream of the dredger is done on a regular basis, and tested for physical properties and heavy minerals content. The results of the laboratory testing program reveals that the physical properties of material also affect the mine reconciliation discrepancies, as the gravity separation of heavy minerals takes place during the sluicing process. An enhanced ore reserve estimation model for the current dredge mining area is also developed by means of the latest geostatistical software to improve mine reconciliation. Sonar and laser profiling technologies, in conjunction with sampling and testing of heavy minerals, can effectively be utilised to improve dredge mine reconciliation in the heavy minerals sand mining industry.
Keyword heavy minerals, dredge mining, mine reconciliation, sonar sounding, laser profiling
Additional Notes Colour Pages: 14-20, 44, 47, 52-53, 55, 59-60, 62, 64-65, 72, 75, 83-92, 95, 99, 101-106, 110, 116, 118-122, 125-126, 151-159. Landscape Pages:74, 83-88(colour), 95(colour), 115-116(colour), 118-122(colour), 197.

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Created: Wed, 10 Nov 2010, 22:21:37 EST by Mr Gan Samaradivakara on behalf of Library - Information Access Service