Laubscher block caving manual Moreover, development openings have to be designed and located to withstand moving and caving ground. Surface subsidence is inevitable and must be allowed for in the case of sublevel and block caving. Block caving is an underground mining method that uses gravity to exploit massive, steeply dipping ore bodies located at depth. Determination of optimum drawpoint layout in block caving using sequential Gaussian simulation. Block ( gravity) caving is a bulk underground mining method, which allows large low- grade deposits to be mined underground. It is a useful technique to extend.
Cavingisthelowest- cost underground mining method provided thatthe. In the mid- 1990s, the South African rock mechanics expert, Dr. CAVE MINING HANDBOOK _ _ _ _ _ Page 2 of 138 Chapter 1 INTRODUCTION The object of this handbook is to highlight factors which lead to problems in cave mining and to summarize the contents of the “ Manual on Block Caving” so as to provide a reference on all facets of cave mining. " Proceeding of Second International Symposium on Block and Sublevel Caving. Block Caving Manual. A new cavability index ( CI) for block caving mines is introduced. Online courses, short courses and live webcasts about Block Cave Mining for mining and geoscience from Edumine. Download A4 | Letter SRK News | Issue 56 : Caving In, International Caving Study ( ICS) published a practical manual on block caving by Dr. Figure 7- Subsidence arising from block caving operations, Dutoitspan and Bultfontein Mines, Kimberley, South Africa ( Photo: P. A MODEL FOR GRAVITY FLOW OF FRAGMENTED ROCK IN BLOCK CAVING MINES Matthew Edward Pierce SUMMARY of a thesis submitted for the degree of Doctor of Philosophy at The University of Queensland in September Sustainable Minerals Institute ( SMI) WH Bryan Mining & Geology Research Centre.
These ore bodies are generally low grade in nature and are too deep to be extracted through open pit mining. Guidelines On Caving Mining Methods: The Underlying Concepts. The interaction matrix based on the rock engineering system ( RES), that analyzes the interrelationship between the parameters affecting rock engineering activities, is used to study rock mass cavability.
Mine Sequence Optimization for Block Caving Using Concept of ‘ Best and Worst Case’ 3 Figure 5 demonstrates an example of the best and worst sequence concept and how other sequence options are located within this range. An improvement for rock engineering system ( RES) coding method is done in this paper by using fuzzy systems. * María José Latorre. Prepared for Caving. Please try again later. This sequence of mining is no longer widely used. Laubscher ( ) Block or panel caving strategy A block cave strategy will lead to more lateral dilution mixing than panel caving. " Cave mining: 16 years after Laubscher' s 1994 paper ‘ Cave mining– state of the art'. Cite As: Ugarte, E, Pourrahimian, Y & Boisvert, JB, ' Determination of optimum drawpoint layout in block caving using sequential Gaussian simulation', in M Hudyma & Y Potvin ( eds), Proceedings of the First International Conference on Underground Mining Technology, Australian Centre for Geomechanics, Perth, pp. Laubscher, DH, ‘ A practical manual on block caving’, Block Caving Manual, The University of Queensland, Brisbane, pp. Ngidi, SN & Pretorius, DD,, ‘ Impact of poor fragmentation on cave management’, in Y Potvin, ( ed. The identification of influencing parameters and cavability assessment are, thus, a prime geotechnical focus for all potential caving projects.
The Block Cave Manual has been built mainly around and/ or influenced by the experiences of Dr Laubscher in countries such as. [ 16] Chitombo, G. Despite the importance of gravity flow, there is debate within the literature about the influence that the height of draw, particle size and particle size distribution has on the geometry of extraction and movement zones. The MRMR Rock Mass Rating Classification System in Mining Practice J Jakubec1 and D H Laubscher2 ABSTRACT The in situ rock mass rating system – IRMR - leading to the mining rock mass rating system - MRMR - for jointed rock masses has been used ( and abused) in mining operations around the world for the past 27 years. [ 17] Laubscher, D H.
Block 4 is currenHy being mined as a BibCk Cave. In block caving, a large section of rock is undercut, creating an artificial cavern that fills with its own rubble as it collapses. Students ( in order of appearance) : * Sergio Godoy. It is the underground version of open pit mining. Applied to induce caving rather than to prevent the occurrence of caving.
Production must be maintained at a steady and continuous level to. John Wiley & Sons. Stopiog method for the mining of Blocks 1, 2 and 3. Laubscher block caving manual. Engineering rock mass classifications: a complete manual for engineers and geologists in mining, civil, and petroleum engineering. Thisincludes blockcaving, panelcaving, inclined- drawpoint caving, and frontcaving. Proceeding of Second International Symposium on Block and Sublevel Caving. Block caving is an underground hard rock mining method that involves undermining an ore body, allowing it to progressively collapse under its own weight. The opportunity to identify the value of the best option is an excellent reference for a mine.
Block caving methods rely on gravity to break and transport large amounts of ore and waste. This first comprehensive block caving publication was co- authored by several industry experts, including Dr. Laubscher ( ) Uniformity of draw High uniformity of the tonnage drawn from the neighbour drawpoints will Julin ( 1992), Susaeta ( ) lead to high interaction and late dilution entry. Perth: Australian Centre for Geomechanics. Block caving is large- scale mining method that allows for huge volumes of rock to be extracted efficiently.
A Practical Manual on Block Caving. Dennis Laubscher. Block Cave Mining - Courses and Live Webcasts. * Verónica Lagos. The term ' block caving' probably originated in the porphyry copper mines, where the area to be mined was divided into rectangular blocks that were mined in a checkerboard sequence with all the ore in a block being removed before an adjacent block was mined. By drawing rock from the extraction level in the lower part of the mine, a gap is created. Professor: Camilo Suarez. The process of identifying and optimising a mining method to mine the Block 5 ore body started in 1991 and in Inclined Caving was identified as being a technically feasible method. Block mining system.
Laubscher* Introduction Cavemining refers toallmining operations in whichtheorebody cavesnaturally after undercutting andthecavedmaterial isrecovered through drawpoints. Mining methods such as block caving or sublevel caving rely on the characteristics of the rock mass to cave efficiently to fulfill an economical production. A fuzzy expert semi- quantitative coding methodology is designed to assess the cavability of rock mass within the RES framework. Laubscher developed the Mining Rock Mass Rating ( MRMR) system by modifying the Rock Mass Rating ( RMR) system of Bieniawski. ), Proceedings of the Second International Symposium on Block and Sublevel Caving, Australian Centre for. Laubscher, DH, Block Caving Manual, prepared for the International Caving Study, Julius.
Alan Guest and Jarek Jakubec of SRK Consulting ( Canada) Inc. Dennis Laubscher, published what turned out to be a landmark paper on the design of caving operations, with the subsequent compilation of the definitive block caving manual. However, the development time before production starts is longer compared to other mining methods. Cavability Assessment with MRMR classification. Alan Guest and Jarek Jakubec of SRK Consulting. Module: General english II. This method involves undermining the orebody to make it collapse under its own weight into a series of chambers from which the ore extracted. In, International Caving Study ( ICS) published a practical manual on block caving by Dr.
In the MRMR system the stability and support are determined with the following equations:. This feature is not available right now.