... Abstract Cuiabá Mine (Anglogold Ashanti) is located at Sabará, at the northwest portion of Quadrilátero Ferrífero - Central region of Minas Gerais, Brazil. The underground gold mine is currently operating down to 1200 m depth, adopting the sublevel stoping as the main mining method. Design...

... Abstract In a sublevel caving mine, the ore recovery, side rock dilution and the total ore extraction rate are determined and controlled at the draw point. The decision to stop loading at a drawpoint and continue blasting the next fan is critical. Abandonment of the draw point too early leads...

...Harmonising Rock Engineering and the Environment Qian & Zhou (eds) © 2012 Taylor & Francis Group, London, ISBN 978-0-415-80444-8 Geotechnical design of the sublevel stoping method for the Poder and Trabajo Veins in the San Genaro Mine Peru A. Samaniego & H.I. Pehovaz SVS Ingenieros SAC & Mining...

... deformation sublevel Sinkhole Subsidence pillar reserves evaluation Simulation prediction sinkhole landslide effective range limestone damage zone strata 11th Congress of the International Society for Rock Mechanics Ribeiro e Sousa, Olalla & Grossmann (eds) © 2007 Taylor & Francis Group...

... to sustain stable the stopes without any supporting. This class includes room & pillar, stope & pillar, shrinkage stoping and sublevel stoping. Artificially methods are those that some type of structural support or backfill is used to provide substantial artificial support to maintain stability...

... techniques such as cut-and-fill, open stoping with fill and sublevel caving; and open pit mining for the exploitation of the upper parts of two orebodies. In this paper we present a summary of the rock mass conditions encountered and the different mining methods selected and put into practice...

... is mined annually using sublevel caving. The crude ore is transported underground through ore passes from the production levels to the main haulage level. The ore passes constitute a critical link in the production chain and high availability is required. There are currently eight groups of ore passes...

... ABSTRACT: Stresses and rock displacement induced by the sublevel mining system for a steep coal seam were analyzed with in-situ measurements and a numerical model in order to optimize the actual mining sequence and to guarantee the safety of the roadways. In-situ measurements, such as rock...

... ABSTRACT: During the sublevel driving in steeply inclined coal seams with high firedamp contents, a critical value of the driving rate has been observed over which high emissions of gas are produced up to levels that force to stop the works and, sometimes, even gasdynamic phenomena...

... ABSTRACT: The three-dimensional Distinct Element Method (program 3DEC) was applied to the stability of Jointed rock mass for a full scale test of a sublevel stoping mining method in Kiruna mine, Sweden. The computational model consists of 9 major faults and 256 blocks. The mining of primary...

... ABSTRACT: Stability problems in sublevel stoping caused by excessive 30 – 70 MPa horizontal stresses, have been largely eliminated at the Outokumpu Oy Pyhasalmi mine by pre-reinforcement with cable bolting, yielding pillars and stope shaping, rock destressing by sequential stoping technique...

... to marl and clay. Application of the sublevel method causes - depending on the hanging wall - either immediate roof caving or the formation of open spaces up to 2800 m 2 (horizontal cross section). The stability limit of open spaces was determined by means of observation in situ and calculation...

... down to the +35 m and +20 m levels respectively. In the upper levels of the NE group of orebodies, immediately under the original open pits, extraction was carried out by sublevel caving. Caving did not seem to occur naturally, and this caused difficulties in winter when the mine was exposed to arctic...

... correlated with excavating process and regularly varied with its productive operation. Fig. 2 is the representative of hundreds displacement-time curves, which-clearly expresses the variation of displacement velocity at different stages. b)When the sublevel is not worked, a chamber can only obviously...