China
Africa
Explore chapters and articles related to this topic
Tailings management using TDR technology
Published in A.A. Balkema, Tailings and Mine Waste 2000, 2022
K.M. O’Connor, D.A. Poulter, D. Znidarcic
This ratio of velocities is approximately equivalent to the dielectric constant of the medium in which the probe is embedded. Since the dielectric constant of water is about 81 while that of mineral soil grains is 3–5, the measured dielectric constant is predominately a function of volumetric water content, θv=Vw/Vt where Vw is the volume of water and Vt is the total volume. The relationship between volumetric water content and propagation velocity is linear (Herkelrath et al, 1991), θv=b?(1/Vp)??- a as shown in Figure 3 for clay loam and nickel mine tailings. The slope, b, and offset, c, are functions of the particular porous material, and they are determined by conducting laboratory calibrations (Topp et al, 1994; Zegelin and White, 1994).
A design procedure for evaluation and prediction of in-situ cemented backfill performance
Published in Ferri Hassani, Jan Palarski, Violetta Sokoła-Szewioła, Grzegorz Strozik, Minefill 2020-2021, 2021
The Kalatongke Copper-Nickel mine was located in Fuyun County, Xinjiang. It was a non-ferrous metal company integrating mining, mineral processing and smelting (Bing and Jun, 2003; Xiaosu, 2009). At present, Gobi aggregate were used as filling aggregate in the mine (Chen et al., 2018). With the continuous improvement of national environmental protection requirements in recent years, procurement costs had risen sharply, and a large amount of smelting slag in the mine was also facing high disposal costs. In order to reduce the filling cost, the filling aggregate optimization test was carried out . Through in-situ coring and strength testing of cemented backfill in the underground industrial stope, the quality of in-situ backfill was systematically evaluated to guarantee the safety of stope (Ghirian and Fall, 2013; Di and Sijing, 2015).
New progress and sustainable development of rock mechanics and engineering in China
Published in Wang Sijing, Fu Bingjun, Li Zhongkui, st Century, 2020
The Jingchuan nickel mine in Gansu province is the second largest sulfured nickel mine in the world, and the largest in China accounting for 70% of know nickel deposits. During the first stage of mining, the upper parts of the ore deposits were extracted by open pit excavation, which ended in 1990. During the second stage, the exploitation of ore deposits buried relatively deeply (500–600m below the ground) has been through underground excavation. The ore body and surrounding rock had experienced several tectonic movements, the faults and joints are of frequent occurrence, and the in-situ stress is very high. Therefore, through the conventional mining technique, leaving rock pillars first and then retrieving them. It would be rather difficult to stabilize the rock pillars, and the rate of recovery of ore would be very low.
Anatomy of an obducted ultramafic unit (Tiébaghi Massif – Peridotite Nappe – New Caledonia): Polyphase brittle tectonics constrained by fault-slip data and crack seal mineralogy
Published in New Zealand Journal of Geology and Geophysics, 2023
Pierre Maurizot, Bernard Robineau, Julie Jeanpert, Marion Iseppi, Stéphane Lesimple, Farid Juillot, Michael Meyer, Patrick Fullenwarth, Vincent Mardhel
In this paper, we present several new sets data collected in the Tiébaghi Massif, a klippe of the Peridotite Nappe located in the north of New Caledonia. These data were collected by investigating two different types of mining works: the underground works of the Chromical hypogene chromite deposit and the open-cast works of the Société Le Nickel (SLN) supergene nickel deposits. In nickel mine, ground electro-magnetic (EM) survey and drilling data have been used to constrain the geometry of the mineralisation. In both the hypogene chromite deposit and supergene nickel works, structural, micro-structural measurements and oriented samples have been systematically collected to determine the chronology and kinematic parameters of the structural evolution of the ultrabasic unit. Raman spectrometry and TEM microscopy provided additional information on the composition of the minerals associated with the different kinematic indicators.
A novel long-short term memory network approach for stress model updating for excavations in high stress environments
Published in Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards, 2023
J. Morgenroth, K. Kalenchuk, L. Moreau-Verlaan, M. A. Perras, U. T. Khan
Garson Mine is a copper-nickel mine located near the town of Garson, Ontario, on the southeast rim of the Sudbury Basin (Figure 3). The copper-nickel sulphide deposits are hosted in parallel shears, which are offset by later stage dyke intrusions. The footwall typically consists of the lower zone Norite of the Sudbury Igneous Complex and metavolcanics (Greenstone/Metabasalt), while the hanging wall consists of metasediments. A bifurcated olivine diabase dyke crosscuts the host rock and the orebodies at Garson. The Garson Mine orebodies are more deformed than any other orebodies of the Sudbury Basin. The orebodies strike approximately east–west and dip south 75°. The geomechanical parameters applied to the initial FLAC3D model and used as part of this research are provided in Table A1 and Table A2 (Kalenchuk 2018). Note that it is not within the scope of this study to validate these rock mass parameters, as they have been based on previous work by geomechanical consultants spanning back to 2012.
The effect of mineral composition on direct aqueous carbonation of ultramafic mine waste rock for CO2 sequestration, a case study of Turnagain ultramafic complex in British Columbia, Canada
Published in International Journal of Mining, Reclamation and Environment, 2022
Jiajie Li, Anthony D. Jacobs, Michael Hitch
This study investigated the direct aqueous carbonation of nickel mine waste materials (which was dunite) from Turnagain ultramafic complex in British Columbia, Canada, with different extents of serpentinisation. The aim of the study was to determin the influence of feed variations on carbonation efficiency and develop an applicable integrated mineral carbonation process. Direct aqueous carbonation in a high-pressure and high-temperature laboratory-sized autoclave was chosen to test the carbonation extent, as the process offers the best application potential being a commercialised process [45,46]. The Rietveld method analysis on the X-ray diffraction patterns was used to quantify the mineral composition of pre- and post- carbonated products, and has been successfully used to quantify serpentine containing materials in the past [47]. The obtained results will provide basic criteria for the evaluation of the carbonation potential of an ultramafic mine deposit at a pre-feasibility study stage for a mining operation.