The upper part of the Revue basin in the Manica District, Mozambique is located in a mountainous area underlain by rocks of the Manica greenstone belt. This greenstone belt has alluvial gold deposits in the Revue river and its tributaries Chua and Zambuzi. Alluvial gold in the Manica District has been mined by local people using artisanal mining methods (panning) and by small scale companies. The recovery process of gold involves washing of the auriferous gravel with large quantities of water and the surface water quality has been impaired in this process. The aim of this dissertation is to assess the impact of alluvial gold mining on surface water quality in the Revue basin. Physical and chemical characteristics of the surface water were determined upstream of, within and downstream of the mining area and in the main tributaries immediately before flowing into the Revue river. Upstream of the mining area the water is clear and the rock types of the Manica greenstone belt are likely to be the only source of metals dissolved in the water. Metal concentrations are generally low except Cd, Mo and Ni but the water in this area meets all World Health Organization (WHO) recommendations for drinking water. In contrast within the mining area there are signs of pollution. The water is cloudy and the highest concentrations of most metals are found in the lower part of this area where mining activity is very intense. Thus, the alluvial gold mining is responsible for elevated metal concentrations and constitutes the major point source of pollution in the Revue basin. Water quality within the mining area has been affected and metals Ba, Pb and Mn have concentrations exceeding the WHO recommended values for drinking water. Downstream of the mining area the impounded water in the Chicamba Dam, which is the source of potable water for Chimoio City, reduces the water flow in the Revue river and sedimentation of suspended sediments occurs, together with associated adsorption and precipitation processes. This result in general improvement of water quality with only Ba and Pb concentrations remaining above the WHO recommended values for drinking water. Increase in concentration of metals AI, Ba, K, Pb and Sr occurring in the Chicamba Dam is likely to be due to input to the dam of water from rivers which cross the Granite-gneiss Complex. Geochemical speciation modelling using MINTEQA2 program suggests that the behaviour of metals Cr, AI, Mn and Fe is controlled by redox and precipitation reactions while the behaviour of As, Cd, Zn, Cu, Ni, Pb, Ba and Ca is controlled by adsorption on the sediment surfaces. Changes in environmental conditions, such as pH and dissolved organic matter (DOM) could result in metals being released back into the water. Modelling the effect of a change in pH and variation in DOM indicate that adsorption and precipitation would decrease with decreasing pH values and with increasing DOM. The chemical form of dissolved metals, the type of interactive processes (absorption and precipitation) and concentration of particulate matter gives the distribution of pollutants while the transport process affect the fate of pollutants in the Revue river water. / Thesis (M.Sc.)-University of Natal, Durban, 2000.

Sustainable tourism development strategies are regarded as suitable for developed countries, while pro-poor tourism strategies are seen as suitable approaches for underdeveloped countries. Both approaches stress the importance of local community-based or collaborative tourism management. The goal of these strategies is for local communities to achieve a more equitable share of benefits accruing from tourism development. This study dealt with the problem of which policy changes need to be brought about to ensure sustainable tourism development on Bazaruto Island. From an economic perspective, one would wish to examine the economic returns to tourism, ensuring that as many of the benefits as possible stay within Mozambique while some accrue to local community members. In addition, from an ecological perspective, it would be necessary to ensure that much of the pristine environment is retained. The local community would wish to ensure significant participation in preserving and promoting its culture as part of the development of tourism.

Sustainable tourism development strategies are regarded as suitable for developed countries, while pro-poor tourism strategies are seen as suitable approaches for underdeveloped countries. Both approaches stress the importance of local community-based or collaborative tourism management. The goal of these strategies is for local communities to achieve a more equitable share of benefits accruing from tourism development. This study dealt with the problem of which policy changes need to be brought about to ensure sustainable tourism development on Bazaruto Island. From an economic perspective, one would wish to examine the economic returns to tourism, ensuring that as many of the benefits as possible stay within Mozambique while some accrue to local community members. In addition, from an ecological perspective, it would be necessary to ensure that much of the pristine environment is retained. The local community would wish to ensure significant participation in preserving and promoting its culture as part of the development of tourism.