African Mining ’91 by S. E. Jonah, J. A. Cox (auth.)

By S. E. Jonah, J. A. Cox (auth.)

The moment 'African Mining' convention is deliberate for June 1991, and follows the 1st, very winning, occasion held in could 1987. That complete four-year interval was once characterised by means of immense adjustments within the political and economy of many nations in either hemispheres. Copper costs have been fairly enterprise, and the improvement and regular call for for nickel and ferrochromium stabilized vital sectors of the mineral undefined, definitely in Zimbabwe. The promise for gold remained unfulfilled, however the smaller, really versatile, mines survived and purely the massive, deep and low-value mines look heavily in danger. None of this has affected the hungry, and extensive exploitations from floor to the water-table have published many objectives of promise to these prepared to take the hazards. The trend in Southern Africa was once terribly sturdy one of the turmoil, with independence for Namibia, changes in South Africa and a gentle shift to marketplace economies within the area. The speed of exploration has elevated to get better a few a part of the growth that used to be misplaced within the Independence fight, and atthe finish of the 1st decade in Zimbabwe, for instance, oil is being sought within the Zambesi Rift, following the research of the Luangwa in Zambia, and there are fascinating exploration tasks for methane published from coal, deep in its basins.

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1990. Mining 1 Geotechnical aspects of vertical crater mining method in a deep mine S. C. Goel Zambia Consolidated Copper Mines Ltd, Zambia SYNOPSIS I NTRODUCTI ON Vertical Crater Retreat is compared to other open stoping methods. Various geotechnical factors have been considered including the effects of stress concentration, jointing, dynamic stresses superimposed by blasting vibrations, amount of development required and shrinkage draw. All these factors favour a VCR method in a deep mining environment.

The method, however, suffered from the following disadvantages: . TIOHAL 60 >; I ~ [] [J X r- [~ DAILLI"~ 1400' L£VH ISIO L ~ nlOL (HA"IlA OIIllLItUIl LEVEL. 'Umm FA N HOLES II .. 1m ~ RI. PILLAR lS90L GltrZZ UY LEVU ~ I + + ~ + -+ + -t 'l A" Fig. 7 + + •+ . ALL 1I t- I · larger blasts of normally 180 kg explosive per delay · premature fall of ore after every blast resulting in poor fragmentation. It was therefore realised that the next logical stage of development should be the use of down the hole machines for drilling longer holes.

124 125. 2. Investment in African Mining Development. E. Bolte. Workshop on African Mining Development, organised by the Economic Commission for Africa, Harare. 1990. 3. , Phimister G. P. A review - past, present and future - of Zimbabwe's mining industry. African Mining 1987 Harare, IMM. p. 401 - 424. 4. Associates. Startup of new mine, mill-concentrator and processing plants for copper, lead, zinc and nickel. Prepared for the World Bank, November 1979. 5. The Economist, December 8th 1990, p. 75 6.

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