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Keywords: extraction
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Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-381
... Abstract Exploiting deep geothermal energy is always an important topic in energy fields, however, there are still no well-established methods to extract heat energy from hot dry rock (HDR) in the scale of commercialization. Hydraulic stimulation or fluid-rock interaction can cause fracture...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-384
... in heat energy extraction from geothermal reservoirs, the embedded discrete fracture model (EDFM) is employed to explicitly tackle these fractures. The matrix part is treated as elastic porous media, in which the fluid-heat flow and rock deformation are solved by a mixed finite volume and finite element...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-274
... in the number of events per kilometer (a factor of 4 to 8) in comparison to the initial mining district using side-by-side longwall extraction. The importance of gate and barrier pillar designs for stress and seismicity control is demonstrated using geotechnical data and stress monitoring from three case...
Proceedings Papers

Paper presented at the 13th ISRM International Congress of Rock Mechanics, May 10–13, 2015
Paper Number: ISRM-13CONGRESS-2015-185
... Abstract Lonmin Platinum has experienced several cases of large-scale hangingwall instabilities during the extraction of the Upper Group 2 Chromitite Layer (UG2) at a number of the Marikana operations along the Western Limb of the Bushveld Complex. These instabilities were all attributed...
Proceedings Papers

Paper presented at the 13th ISRM International Congress of Rock Mechanics, May 10–13, 2015
Paper Number: ISRM-13CONGRESS-2015-207
... the conglomerate is left in-situ to form a competent hangingwall which can stabilize and prevent exposure of the weak Khakishale. This method of extraction was developed through trial and error and has been used reasonably successfully since its inception in the early 1960's where the method was developed...
Proceedings Papers

Paper presented at the 13th ISRM International Congress of Rock Mechanics, May 10–13, 2015
Paper Number: ISRM-13CONGRESS-2015-126
... in the Lorraine region of north-eastern France cover a surface area of approximately 3,900 km2 and involve more than 150 cities. A total extraction method was usually used during exploitation, but this technique was sometimes replaced by the room and abandoned pillar technique when it was necessary to protect...
Proceedings Papers

Paper presented at the 13th ISRM International Congress of Rock Mechanics, May 10–13, 2015
Paper Number: ISRM-13CONGRESS-2015-151
... South Wales, south of Sydney. The Dendrobium Mine, owned by BHP Billiton s Illawarra Coal, was required to manage the extraction of longwall panels in the vicinity of a particularly significant overhanging rock feature and major waterfall Sandy Creek Waterfall (Walsh et al, 2014b). The issue...
Proceedings Papers

Paper presented at the 12th ISRM Congress, October 16–21, 2011
Paper Number: ISRM-12CONGRESS-2011-279
... method uses large sublevel stopes and fan blast- ing. The stopes are 20 m wide, 30 m high and between 20 m and 60 m long. The method used to exploit the area consists in extracting the primary stopes with a height of 30 m, and then extract the secondary stopes, of the same size, located between...
Proceedings Papers

Paper presented at the 12th ISRM Congress, October 16–21, 2011
Paper Number: ISRM-12CONGRESS-2011-272
...Harmonising Rock Engineering and the Environment Qian & Zhou (eds) © 2012 Taylor & Francis Group, London, ISBN 978-0-415-80444-8 A new method on extraction of two thick seams simultaneously on extremely difficult ground condition a case study C.N. Ghosh, Prashant, P.K. Mandal, John Loui P...
Proceedings Papers

Paper presented at the 11th ISRM Congress, July 9–13, 2007
Paper Number: ISRM-11CONGRESS-2007-019
... of As. The results of the leaching and adsorption experiments showed that the As concentration leached from the muck decreased with the number of extractions, and that the leached As was adsorbed by silty soils in accordance with a Henry type-adsorption isotherm. This indicates that utilizing silty soil as a bottom...
Proceedings Papers

Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-224
.... These layouts are based on the concept of grid-type, scattered mining with dip pillars for regional support. As the extraction of the gold reefs extends to depths below 3500 m, the hazards associated with mining at these ultra-depths are expected to increase to unacceptable levels. Therefore, the question...
Proceedings Papers

Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-100
... An investigation was carried out to determine whether a numerical model could be constructed that would produce results that realistically represent actual ground deformations in and around a vertical shaft. The ground deformation was brought about by the partial extraction of the shaft pillar...
Proceedings Papers

Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-119
... A process for evaluating different options for extraction of mining blocks is presented. The process is described and an example of the application of the process to a case study is presented. Un procede pour evaluer differentes options pour l'extraction de blocs d'exploitation est presente. Le...
Proceedings Papers

Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-110
... decline and chairlift from number one shaft. The shaft infrastructure at Beatrix Gold Mine is shown in Figure 1. vertical shaft early shaft reef removal intersection shaft Reservoir Characterization satellite pillar extraction Beatrix structural geology dislocation stiff fill backfill...
Proceedings Papers

Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-171
... The established crown pillar extraction method at Gold Fields Australia Ltd.'s Crusader Mine, leads to the significant dilution and poor recovery of ore due to caving of the overlying loose rockfill. The application of selectively injecting specifically developed 'FB200' ettringite (calcium...
Proceedings Papers

Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-196
... of creating a stable pillar system to maintain pillar stresses at acceptable levels and to minimise the amount of stope closure. The starting point for the design process was to determine the pillar strength characteristics of both the Merensky and UG2 seam types for the primary and secondary extraction...
Proceedings Papers

Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-157
... Extraction of isolated blocks of ground with elevated levels of stress and/or seismicity is a common occurrence in South African gold mines. Isolated blocks of ground that are divorced from the main orebody and are bound by complex, dip and strike parallel, non-persistent geological structures...
Proceedings Papers

Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-188
... under the influence of increasing dimension of the excavation. Stiffness of pillars/overburden, extraction ratio and depth cover are observed to be the important parameters for the estimation of mining induced stress over the pillar. These parameters influence, both, the value of ultimate induced stress...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-284
... ABSTRACT: Prediction of roof falls inside the goaf during extraction of coal was attempted by many investigators on the basis of convergence monitoring data. In majority of the cases the data was collected by daily manual measurement of roof to floor convergence. Exact information about sharp...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-065
... ABSTRACT: In Mochia mine (of Hindustan zinc Limited, Udaipur, India), lead-zinc ore was extracted upto 7th level leaving a skeleton of remnant pillars at upper levels. At 7th level, a 48m thick horizontal pillar was left to protect workings below and a 43m, wide auxiliary shaft pillar was left...

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