African Mining 91

The second 'African Mining' conference is planned for June 1991, and follows the first, very successful, event held in May 1987. That full four-year period was characterized by substantial changes in the political and economic climate of many countries in both hemispheres. Copper prices were relatively firm, and the advance and steady demand for nickel and ferrochromium stabilized important sectors of the mineral industry, certainly in Zimbabwe. The promise for gold remained unfulfilled, but the smaller, relatively flexible, mines survived and only the large, deep and low-value mines seem seriously at risk. None of this has affected the hungry, and intensive exploitations from surface to the water-table have revealed many targets of promise to those willing to take the risks. The pattern in Southern Africa was extraordinarily stable among the turmoil, with independence for Namibia, adjustments in South Africa and a gradual shift to market economies in the region. The pace of exploration has increased to recover some part of the progress that was lost in the Independence struggle, and atthe end of the first decade in Zimbabwe, for example, oil is being sought in the Zambesi Rift, following the investigation of the Luangwa in Zambia, and there are exciting exploration projects for methane released from coal, deep in its basins.

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The second 'African Mining' conference is planned for June 1991, and follows the first, very successful, event held in May 1987. That full four-year period was characterized by substantial changes in the political and economic climate of many countries in both hemispheres. Copper prices were relatively firm, and the advance and steady demand for nickel and ferrochromium stabilized important sectors of the mineral industry, certainly in Zimbabwe. The promise for gold remained unfulfilled, but the smaller, relatively flexible, mines survived and only the large, deep and low-value mines seem seriously at risk. None of this has affected the hungry, and intensive exploitations from surface to the water-table have revealed many targets of promise to those willing to take the risks. The pattern in Southern Africa was extraordinarily stable among the turmoil, with independence for Namibia, adjustments in South Africa and a gradual shift to market economies in the region. The pace of exploration has increased to recover some part of the progress that was lost in the Independence struggle, and atthe end of the first decade in Zimbabwe, for example, oil is being sought in the Zambesi Rift, following the investigation of the Luangwa in Zambia, and there are exciting exploration projects for methane released from coal, deep in its basins.

Contenu
General.- Strategy for increasing gold production: the case of A. G. C. (Ghana) Ltd.- Debt funding for African mining projects: issues, options and sources.- Small-scale mining to commercial operationsrequirements for successful development.- Role of small-scale mining in Africa: building on the informal sector.- Mining 1.- Geotechnical aspects of vertical crater mining method in a deep mine.- Stability predictions based on back analysis of collapsed crown pillar. Epoch mine, Zimbabwe.- Metallurgy 1.- Two gold heap leach operations in Zimbabwe.- Heap leaching of clayey oreThree Cheers project, Selous, Zimbabwe.- Improving the recovery of gold and copper in a CIP operation: flotation of a sulphide copper-bearing ore.- GeologyExploration.- Exploration for gold by use of cyanide leach analytical techniques on soil samples in the Greenstone Belts of Zimbabwe.- Design and development of a lithogeochemical database for regional exploration using dBASE IV.- Ruby and garnet gemstone deposits in southeast Kenya: their genesis and recommendations for exploration.- Geology and exploration of the Bokitiso Concession, Central Region, Ghana.- Metallurgy 2.- Pre-designed modular plants for small-scale mining operations in Third World countries.- Critical evaluation of small-scale gold plants in Africa, with special reference to Geita gold plant, Tanzania.- Effect of particle size in gravity separation processes at Palabora, South Africa.- Influence of some operating parameters on the metallurgy of a column cell around the region of optimum performance.- Mining 2.- Nonel initiation system trials in ZCCM operations.- Water management at Rössing uranium mine, Namibia.- Black Mountainthe oasis mine.- Metallurgy 3.- Application of CodelcoChile pyrometallurgical techniquesat the Nkana smelter, Zambia.- Process options for modification of the Outokumpu refinery circuit at BSR Ltd to improve base and platinum group metal recoveries.- Challenges associated with electrowinning nickel at BSR Ltd, Zimbabwe.- Production of ferrosilicon in Zimbabwe.- Mining 3.- Use of trucks in the underground false footwall block caving mining method of King mine, Zimbabwe.- Problems of mining around a sill intersecting the Shangani orebody, Zimbabwe.- Advances in cost-effective support technology for rock reinforcing in some deforming ground condition.- Artisanal mining in the Lake Victoria goldfields, Tanzania.- Metallurgy 4.- Metallurgical circuit development and optimisation subsequent to commissioning of the tailings leach plant stage III at Nchanga Division of Zambia Consolidated Copper Mines Ltd, Zambia.- New developments in X-ray fluorescence analysis of metallic and mining samples.- X-ray fluorescence spectrometry in the mining industry.- Geology.- Groundwater flow model for Konkola underground copper mine, Zambia.- Controls on Archaean gold mineralization in the Mashava area, Zimbabwe.- Geological setting of gold deposits in the Mutare Greenstone Belt, Zimbabwe.- General 2.- Regional strategies for the minerals industries of the states of the SADCC.- Development of a minerals information and evaluation system.- Minerals and the environment in Ghana.