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Petra Diamonds Limited Sustainability Report 201238ENVIRONMENTAL PERFORMANCEEnvironmental PerformanceCase study: Williamson wins the presidential award for water management and forestry conservation Williamson wins the Presidential Award on Water Management and Forestry ConservationThe Williamson mine's long-standing environmental efforts were officially recognised in FY 2012, when the mine received the Presidential Award on Water Management and Forestry Conservation, at both district, regional and national level. This prestigious award by the President of the United Republic of Tanzania, His Excellency Jakaya Mrisho Kikwete, was made during the World Environmental Day celebrations held in Moshi, Tanzania on 5 June 2012. The environmental competition was initiated by the President in 2010 to promote awareness about environmental management in the country and is carried out from household level to national level, involving different investment institutions, Government institutions, schools, private companies and NGOs. It is held every two years and this is the second time that Williamson has been honoured, as the mine was named winner at district and regional level in 2010.Water managementWilliamson has three dams (Nhumbu, Songwa and New Alamasi) that receive water from different catchment areas during the rainy seasons. There is a closed circuit water system and no water is discharged into the environment. The water is used for mining operations, domestic uses and in the neighbouring villages. Water is treated in Williamson's water treatment plant and supplied to the township for general use. Various controlled water points have been put in place to supply the neighbouring villages with potable water. Williamson samples and monitors the potable water every day for pH levels, turbidity, conductivity and free and combined chlorine. Quarterly samples are also taken for bacteriological, chemical and physical analysis according to the maximum acceptable concentrations set out by the Tanzania Bureau of Standards. A water consumer confidence report is compiled each year.Forestry conservationWilliamson carries out exceptional work in the area of environmental conservation and maintains a large forest reserve of some 9,060,000m². The mine's protection of this area is crucial, as it is under immense pressure as a source of food, fuel and construction. The Williamson Forest comprises of different species of trees (mainly indigenous), animals and birds. The forest provides firewood for neighbouring villages through controlled, sustainable tree harvesting.Williamson's HSE Manager, Donatus Mukungu, commented, "It is an honour for Williamson's focus on environmental management and conservation to be recognised by this award at a national level. Water is a highly precious commodity in Tanzania and one of our most important contributions is the provision of potable water to the Mwadui township. Our forest conservation also plays a vital role in preserving this key resource for future generations."Donatus Mukungu, Williamson's HSE Officer, and Charl Barnard, Country and Williamson Mine Manager, proudly holding the award

Petra Diamonds Limited Sustainability Report 201239COMMUNITY" Positive relationships with local communities are vital to securing support for our activities."