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The use of fractal geometry to model the spatial continuity of gold grades
220A
ANALYSIS TECHNIQUES:MODELLING & NUMERICAL METHODS
965236 Computerised orebody modelling and mine design for Chiria iron ore deposits H. K. Mohanta & A. K. Sen, in: Applications of computers
and operations research in the minerals industries. Conference, Brisbane, 1995, ed A N O N (AusIMM), 1995, pp 21-31.
965241 Global resource estimation and change of support at the Enterprise Gold Mine, Pine Creek, Northern Territory application of the geostatistical discrete Ganssian model J. Vann & H. Sans, in: Applications of computers and
operations research in the minerals industries. Conference, Brisbane, 1995, ed A N O N (AusIMM), 1995, pp 171-179.
The Chiria Iron Ore deposit falls within the well-known Horse-shoe-shaped Singhbhum-Bonal-Keonjhar belt in India. The present study is confined to only one of the four blocks of Chiria v/z North Block, comprising an area of 2.11 km 2. 'Corporate Plan 2005' of SAIL envisages development of a large open cast mine at Chiria to meet its enhanced requirement of iron ore by 2001-02 AD. (from Authors)
The geostatistical Discrete Ganssian (DG) model is demonstrated to be capable of providing an effective means of implicating change of support for Enterprise-style mineralisation and thus providing reliable global recoverable resource estimates. (from Authors)
965237 From databases to visualisution - data transfer standards and data structures of 3D geological modelling W. L. Power, P. Lamb & F. G. Hurowitz, in: Applications of
965242 Overburden volume estimation assisted by geostatisties in open cast coal mine S. A. Oliveira, J. C. Koppe & J. F. C. L. Costa, in:
computers and operations research in the minerals industries. Conference, Brisbane, 1995, ed A N O N (AusIMM), 1995, pp 65-70. Critical to better practice is an understanding of the basic syntax and character of geological and mining data, expressed in the form of a data model. In the short-term, a data model can be used to implement or evaluate schemes for data storage or exchange. It can be used to evaluate software. In the longer term, a data model is essential to the design of the next generation of software for 3D geological modelling. In this and the related paper the data model in used by CSIRO is presented. (from Authors)
Applications of computers and operations research in the minerals industries. Conference, Brisbane, 1995, ed ANON (AusIMM), 1995, pp 181-187. This paper compares different results for overburden volume estimation assisted by geostatistics, particularly using kriging methods. A comparison between the magnitude of the differences in volumes calculated with the different DTMs was attained. These final result indicates the sensitivity of the volume obtained to the number of data points. As the number of data points increases the estimation error decreases, but at some point there is no significant decrease in the final volume with the collection of additional data. (from Authors)
965238 An intetgrnted neural network and machine learning model for multi-dimensional mineral resource assessment I. G. Moore, in: Applications of computers and operations
965243 The use of fractal geometry to model the spatial continuity of gold grades J. F. Costa, A. H. White & M. T. M. B. Vilhena, in:
research in the minerals industries. Conference, Brisbane, 1995, ed ANON (AusIMM), 1995, pp 71-85.
Applications of computers and operations research in the minerals industries. Conference, Brisbane, 1995, ed ANON
The specific application presented involves automatic earth resource modelling and assessment involving geological theories of mineral potential. The developed system functions as a new and powerful mineral exploration tool. To date the model has been trialled on an earth resource database and several published data sets. (from Authors)
(AusIMM), 1995, pp 189-199. This study investigates the fra~tal properties of grade distribution using the variogram and some proposed variations as techniques to measure the fractalness. The aim is to assess applicability of fraetal geometry theory to modelling ore grade distribution in a deposit. A comparison of the results demonstrates the methods which better capture the spatial behaviour of the variable under study. (from Authors)
965239 Some practical aspects of ore reserve estimation at Chuquicamata copper mine, Chile D. G. Krige & P. G. Dunn, in: Applications of computers and
operations research in the minerals industries. Conference, Brisbane, 1995, ed ANON (AusIMM), 1995, pp 125-133. The copper ore reserves at the Chuquicamata mine were reestimated during March to June 1994, as part of the comprehensive audit of the mine's overall short- and longterm planning. The basic principles essential to all ore reserve estimates were implemented; a detailed study of the geology, drillhole and blasthole data sets, statistical and geostatistical analyses, block kriging, and a comprehensive validation of the block valuations. (from Authors) 965240 A revision of ore evaluation techniques at Sishen Iron Ore Mine, South Africa A. P. Vorster & W. L. Schoning, in: Applications of
computers and operations research in the minerals industries. Conference, Brisbane, 1995, ed A N O N (AusIMM), 1995, pp 139-148. A series of improvement projects have been initiated with the main focus on: the computer modelling procedure of the orebody, the method of in situ grade prediction, the use of beneficiation charaeteristies for prediction of final produet grades and the def'mition of ore in the modelling and planning process. Computer systems provided new solutions and insight into the varied geological problems and assisted in re-defining the mineable ore reserves. (from Authors)
965244 Optimisation in underground mine design C. Alford, in: Applications of computers and operations
research in the minerals industries. Conference, Brisbane, 1995, ed A N O N (AusIMM), 1995, pp 213-218. A new tool called the 'floating stope' has been developed to define the optimal (boundary) limit for material that can be economically extracted by underground stoping methods. The method is analogous to the 'floating cone' method of open pit optimisation. The paper outlines the algorithms used in the definition of the stope envelope, and describes the analysis and results of several case studies where the optimisation procedure has been applied. (Author) 965245 Selective extraction dynamic cone algorithm for threedimensional open pit designs J. Yamatomi, G. Mogi, A. Aksike & U. Yamaguchi, in:
Applications of computers and operations research in the minerals industries. Conference, Brisbane, 1995, ed ANON (AusIMM), 1995, pp 267-274. A new algorithm has been investigated for three-dimensional open pit designs to improve the dynamic cone approach which utilises the dynamic programming technique. The algorithm was applied to a large-scale open pit copper mine in a planning stage and the results compared with those obtained by the conventional methods. (Authors)
ANALYSIS TECHNIQUES:MODELLING & NUMERICAL METHODS
965236 Computerised orebody modelling and mine design for Chiria iron ore deposits H. K. Mohanta & A. K. Sen, in: Applications of computers
and operations research in the minerals industries. Conference, Brisbane, 1995, ed A N O N (AusIMM), 1995, pp 21-31.
965241 Global resource estimation and change of support at the Enterprise Gold Mine, Pine Creek, Northern Territory application of the geostatistical discrete Ganssian model J. Vann & H. Sans, in: Applications of computers and
operations research in the minerals industries. Conference, Brisbane, 1995, ed A N O N (AusIMM), 1995, pp 171-179.
The Chiria Iron Ore deposit falls within the well-known Horse-shoe-shaped Singhbhum-Bonal-Keonjhar belt in India. The present study is confined to only one of the four blocks of Chiria v/z North Block, comprising an area of 2.11 km 2. 'Corporate Plan 2005' of SAIL envisages development of a large open cast mine at Chiria to meet its enhanced requirement of iron ore by 2001-02 AD. (from Authors)
The geostatistical Discrete Ganssian (DG) model is demonstrated to be capable of providing an effective means of implicating change of support for Enterprise-style mineralisation and thus providing reliable global recoverable resource estimates. (from Authors)
965237 From databases to visualisution - data transfer standards and data structures of 3D geological modelling W. L. Power, P. Lamb & F. G. Hurowitz, in: Applications of
965242 Overburden volume estimation assisted by geostatisties in open cast coal mine S. A. Oliveira, J. C. Koppe & J. F. C. L. Costa, in:
computers and operations research in the minerals industries. Conference, Brisbane, 1995, ed A N O N (AusIMM), 1995, pp 65-70. Critical to better practice is an understanding of the basic syntax and character of geological and mining data, expressed in the form of a data model. In the short-term, a data model can be used to implement or evaluate schemes for data storage or exchange. It can be used to evaluate software. In the longer term, a data model is essential to the design of the next generation of software for 3D geological modelling. In this and the related paper the data model in used by CSIRO is presented. (from Authors)
Applications of computers and operations research in the minerals industries. Conference, Brisbane, 1995, ed ANON (AusIMM), 1995, pp 181-187. This paper compares different results for overburden volume estimation assisted by geostatistics, particularly using kriging methods. A comparison between the magnitude of the differences in volumes calculated with the different DTMs was attained. These final result indicates the sensitivity of the volume obtained to the number of data points. As the number of data points increases the estimation error decreases, but at some point there is no significant decrease in the final volume with the collection of additional data. (from Authors)
965238 An intetgrnted neural network and machine learning model for multi-dimensional mineral resource assessment I. G. Moore, in: Applications of computers and operations
965243 The use of fractal geometry to model the spatial continuity of gold grades J. F. Costa, A. H. White & M. T. M. B. Vilhena, in:
research in the minerals industries. Conference, Brisbane, 1995, ed ANON (AusIMM), 1995, pp 71-85.
Applications of computers and operations research in the minerals industries. Conference, Brisbane, 1995, ed ANON
The specific application presented involves automatic earth resource modelling and assessment involving geological theories of mineral potential. The developed system functions as a new and powerful mineral exploration tool. To date the model has been trialled on an earth resource database and several published data sets. (from Authors)
(AusIMM), 1995, pp 189-199. This study investigates the fra~tal properties of grade distribution using the variogram and some proposed variations as techniques to measure the fractalness. The aim is to assess applicability of fraetal geometry theory to modelling ore grade distribution in a deposit. A comparison of the results demonstrates the methods which better capture the spatial behaviour of the variable under study. (from Authors)
965239 Some practical aspects of ore reserve estimation at Chuquicamata copper mine, Chile D. G. Krige & P. G. Dunn, in: Applications of computers and
operations research in the minerals industries. Conference, Brisbane, 1995, ed ANON (AusIMM), 1995, pp 125-133. The copper ore reserves at the Chuquicamata mine were reestimated during March to June 1994, as part of the comprehensive audit of the mine's overall short- and longterm planning. The basic principles essential to all ore reserve estimates were implemented; a detailed study of the geology, drillhole and blasthole data sets, statistical and geostatistical analyses, block kriging, and a comprehensive validation of the block valuations. (from Authors) 965240 A revision of ore evaluation techniques at Sishen Iron Ore Mine, South Africa A. P. Vorster & W. L. Schoning, in: Applications of
computers and operations research in the minerals industries. Conference, Brisbane, 1995, ed A N O N (AusIMM), 1995, pp 139-148. A series of improvement projects have been initiated with the main focus on: the computer modelling procedure of the orebody, the method of in situ grade prediction, the use of beneficiation charaeteristies for prediction of final produet grades and the def'mition of ore in the modelling and planning process. Computer systems provided new solutions and insight into the varied geological problems and assisted in re-defining the mineable ore reserves. (from Authors)
965244 Optimisation in underground mine design C. Alford, in: Applications of computers and operations
research in the minerals industries. Conference, Brisbane, 1995, ed A N O N (AusIMM), 1995, pp 213-218. A new tool called the 'floating stope' has been developed to define the optimal (boundary) limit for material that can be economically extracted by underground stoping methods. The method is analogous to the 'floating cone' method of open pit optimisation. The paper outlines the algorithms used in the definition of the stope envelope, and describes the analysis and results of several case studies where the optimisation procedure has been applied. (Author) 965245 Selective extraction dynamic cone algorithm for threedimensional open pit designs J. Yamatomi, G. Mogi, A. Aksike & U. Yamaguchi, in:
Applications of computers and operations research in the minerals industries. Conference, Brisbane, 1995, ed ANON (AusIMM), 1995, pp 267-274. A new algorithm has been investigated for three-dimensional open pit designs to improve the dynamic cone approach which utilises the dynamic programming technique. The algorithm was applied to a large-scale open pit copper mine in a planning stage and the results compared with those obtained by the conventional methods. (Authors)