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Slope stability analysis in open pit mines of Jebel Gustar career, NE Algeria – a multi-steps approach

Zahri F., Boukelloul M. L., Hadji R., Talhi K.

Mining Science

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2016

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Vol. 23

137--146

EN

Several types of instabilities can menace the personnel and equipment in the open cast mines. Their kinematicis dependent commonly on the nature, the structure, the fracturing and the strength of the rock mass. A scientific assessment vis-a-vis their equilibrium is suggested. For this task a considerable amount of field work must already carrying out to supply the necessary data ie: geometric, mechanic and geologic parameters. The main purpose of this research is identifying different modes of slope failures that may develop on the career “ENOF” of Jebel Gustar, by a multi-step analysis. For this task, i) a structural analysis; ii) an estimation of the rock mass and discontinuity mechanical properties, iii) a rating of the rock mass quality, iv) and a numerical simulation of the stability are procedurally used. The results matched well with the field observations. They proved the poor stability of the career, showing a typical example of a bad slope-design. The application of such approaches can help stabilizing the mine and ensure the safety and a sustainable production.

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Application of PROMETHEE mathematical model for choosing a secondary breakage process of the oversized blocks in limestone quarries

Bouhedja A., Idres A., Boutrid A., Bounouala M., Benselhoub A., Talhi K.

Mining Science

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2016

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Vol. 23

121--135

EN

In this paper, the approach consists in selecting the best secondary breakage process of oversize blocks with explosives for the limestone quarries. To solve this problem, we propose the centroid weight method for weighting the selection criteria, and the PROMETHEE model as a multicriteria decision making method. A case study is carried out in the limestone quarry of the cement factory of Hadjar-Soud, Algeria.

3

A model study to measure fragmentation by blasting

Nefis M., Talhi K.

Mining Science

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2016

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Vol. 23

91--104

EN

Accurate measurement of blast fragmentation is important in mining and quarrying operations, to monitor blasting and optimize blast design. A new digital photoanalytical method to measure the size of fragments by using FragScan system is presented here. Photographs of the broken rock are digitized, and individual measurement, based on mathematical morphology techniques, achieves, within successive openings on a binary image, a numerical sieving. The method was tested during recent full scale blasting tests in the case of open pit gold mine of Amesmessa (Algeria). It shows great potential as a practical aid to predicting, monitoring, and controlling the quality of the fragmented rock.

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Chemical treatment of kaolin. Case study of kaolin from the Tamazert– Jijel mine

Chouafa M., Idres A., Bouhedja A., Talhi K.

Mining Science

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2015

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Vol. 22

171--180

EN

The Tamazert-Jijel kaolin deposit is located in eastern Algeria, It was formed during a process of hydro-thermal alteration of feldspars rich in potassium. Kaolin, obtained at the mine, mainly contains varying amounts of impurities such as iron oxide (Fe2O3) and anatase (TiO2). These components negatively affect the quality of the commercial product. This research was performed to improve the quality of kaolin to be used in the paper industry with the goal of reducing the impurities of iron and titanium oxides. Different sized fractions of the original sample were analyzed by XRD. The results obtained showed that the mineralogical composition is: quartz, muscovite, kaolinite, dolomite, albite and orthoclase. Kaolin, like all clays, has a thin dissemination of minerals throughout it. After processing kaolin, the particle size fraction of less than 45μm, corresponding to the liberation mesh size, was retained for purification by chemical treatment with different acids of different concentrations (hydrochloric acid, sulfuric acid, acetic acid), heated to boiling point temperatures. The kaolin samples treated with the various acids above were analyzed by X-ray fluorescence and by XRD. The results obtained from the sample treated with hydrochloric acid show that the iron oxide content of acid is reduced by 1.65% to 0.88%. Meanwhile, the brightness of the sample reached 90% under the effect of the treatment with hydrochloric acid at concentration of 2 mole/dm3.