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Keywords: dilution
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Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-031
... ABSTRACT: The Geotechnical Stope Index aims to highlight the ore's dilution potential. The profile uses calculations to consider historical observations and geotechnical data analysis to identify potential geotechnical hazards about overbreaks in sublevel stoping. After each step, a column...
Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-068
... ABSTRACT: This paper discusses the main causes for unplanned ore dilution in longhole mining and possible mitigation measures. It reports on the results of a case study of an underground mine that uses the longitudinal retreat method for the extraction of a narrow gold-silver orebody...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-010
... efficiency university risk management international conference ore recovery risk and uncertainty assessment knowledge management proceedings sublevel institute dilution metals & mining operator loading information technology exhibition engineering variation orebody...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-287
... of this method by the company, it is extremely important to understand the variables that control the stability and the consequent ore dilution in the extraction inter levels (Da Silva, et al, 2018). To estimate the design parameters, empirical methods are usually adopt, for example the stability graph method...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-348
... pillar sill pillar inclination upstream oil & gas reservoir characterization dilution reservoir simulation sill pillar thickness stope reservoir geomechanics orebody stability configuration hanging wall stability chart variability estimation strength sublevel sill pillar...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-344
... recovery figure overbreak dilution metals & mining pillar brazil breccia dimension strength footwall Rock Mechanics for Natural Resources and Infrastructure Development Fontoura, Rocca & Pavón Mendoza (Eds) © 2020 ISRM, ISBN 978-0-367-42284-4 Using numerical model as a tool to predict...
Proceedings Papers

Paper presented at the 13th ISRM International Congress of Rock Mechanics, May 10–13, 2015
Paper Number: ISRM-13CONGRESS-2015-003
... Abstract Mining worldwide and definitely in South Africa, is constantly under pressure to reduce its cost structure so as to sustain profitability. In underground gold mines where an open stope mining method is employed, dilution often has a significant effect on the viability of sustaining...
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-2003-063
... Dilution of ore has a major impact on economics of a mine. The magnitude of dilution depends on mining method, stope dimensions, reef and host rock quality, wall support and drilling accuracy. The main contributing factor is the presence of very weak graphitic shear band of varying thickness...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-063
... metals & mining stope knowledge management structural geology dilution strength Reservoir Characterization Upstream Oil & Gas Stability Graph Method instability case study low confinement strike length rock mass tensile strength rock mass strength stope strike length...
Proceedings Papers

Paper presented at the 8th ISRM Congress, September 25–29, 1995
Paper Number: ISRM-8CONGRESS-1995-001
... 5916-1 6516-1 6316-1 6316-2 6116-1 5916-1 5916-2 22.5m interval 6 DILUTION STUDY Given the complexity of the Louvicourt orebody it was decided to investigate the influence of the number of 6 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 vertical definition drilling holes on the delineation...
Proceedings Papers

Paper presented at the 8th ISRM Congress, September 25–29, 1995
Paper Number: ISRM-8CONGRESS-1995-258
... ABSTRACT: The success of open stope mining depends largely upon the ideal stope dimensions. If the stopes are made too large, this may cause severe problems such as dilution and increased rehabilitation costs, caving of hangingwall as reported in Zimbabwe's Gath's mine; and chimney caving...
Proceedings Papers

Paper presented at the 6th ISRM Congress, August 30–September 3, 1987
Paper Number: ISRM-6CONGRESS-1987-220
...-three stopes at various stages of extraction. An empirical formulation has been developed based upon the Ruttan data base whereby dilution was quantified in terms of the rock quality, the area exposed and the rate at which the hanging wall is mined. This relationship was found to accurately predict...
Proceedings Papers

Paper presented at the 5th ISRM Congress, April 10–15, 1983
Paper Number: ISRM-5CONGRESS-1983-113
... successful. A simplified analysis of a cable supported hangingwall demonstrates a need for increasing the cable density compared to current practice to improve hangingwall stability. This should form the basis for future trials with the support method to minimize hangingwall dilution. RESUME: La...

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