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Petra Diamonds Limited Sustainability Report 201230ENVIRONMENTAL PERFORMANCEEnvironmental PerformanceProtecting our environment Our approach and key issuesPetra recognises the need to conduct its operations in an environmentally sustainable manner by using resources responsibly, protecting and restoring the environments where we operate and mitigating the impacts of our operations. We are committed to implementing rigorous environmental management processes, developing long-term sustainable practices and meeting international best practice. We aim to continually improve our environmental management systems and promote environmental awareness among our employees and the community. Environmental responsibility is integrated into our strategic planning, management systems and daily activities and we conduct regular internal and external audits of our operations.The main environmental risks to our operations are:$ water consumption in excess of permitted volumes;$ discharge of substandard effluent into nearby water sources; $ unsustainable energy consumption; $ changes in vegetation dynamics and degradation of faunal habitat; $ the impact of climate change, in particular affecting the availability of water; and$ mine stoppages due to non-compliance with regulations.In order to manage these risks and the environmental impacts of our operations, we monitor our environmental performance in the following areas:$ resource and water usage; $ energy consumption;$ carbon emissions;$ dust and waste management; $ protection and biodiversity management of the land upon which our operations are held; and$ rehabilitation and closure procedures.We strive to comply in full with all environmental laws and regulations in the countries where we operate. In addition, our Group Environmental Policy ("the Policy") sets out our commitment to achieving a high standard of environmental performance across all our operations. The Policy is supplemented by our Group Environmental Management Strategy which provides guidance on our Group objectives and key performance areas. The Policy was communicated to all operations and implemented across the Group in FY 2012 and our Environmental Management Strategy is currently being rolled out, with full implementation expected by FY 2013. At an operational level, an Environmental Management System ("EMS"), which sets out detailed processes for mitigating the environmental impacts and risks of our activities, is being put in place for each prospecting and mining licence. This includes a suite of policies that deal with specific environmental issues at each operation.Our objective is that all EMSs should comply with ISO 14001, which is a voluntary international environmental management standard. Finsch and Cullinan have already achieved this goal, whilst Koffiefontein and Kimberley Underground are scheduled for certification by the end of FY 2013. The South African operations also have Environmental Management Programmes ("EMPs") in place, which relate to compliance with the Mineral and Petroleum Resources Development Act ("MPRDA") in South Africa.The Williamson mine has an EMS that is compatible with ISO 14001 and complies with Tanzanian legislation. Subject to approval by Tanzanian authorities, we expect it to be finalised later this year, with certification to follow. The Fissure Mines are currently in the process of developing and implementing procedures in order to implement an EMS compatible with ISO 14001.A full EMS is not yet required for our exploration project in Botswana, but in FY 2012 we completed a Social and Environmental Strategic Risk Report related to the progression of exploration work on kimberlite KX36 and associated drilling programmes. EnvironmentWe recognise the need to conduct our operations in an environmentally sustainable manner by using resources responsibly, protecting and restoring the environments where we operate and mitigating the impacts of our operations.SUMMARY$ We aim to continually improve our environmental management systems and promote environmental awareness among our employees and the community$ We monitor our resource usage carefully, ensuring that materials are reused or recycled wherever possible$ We have identified the management of water as one of our most significant environmental risks due to the impact of climate change$ All our operations have implemented initiatives to reduce energy consumption and increase energy efficiency wherever possible

Petra Diamonds Limited Sustainability Report 201231ENVIRONMENTAL PERFORMANCEEnvironmental PerformanceProtecting our environment continuedEnvironmental incidentsEnvironmental incidents represent a major risk to our reputation and long-term licence to operate. We aim to minimise environmental incidents at all our operations and have put in place processes to manage, as effectively as possible, any incidents which do occur. We classify incidents according to their severity. $ A major environmental incident is associated with widespread, long-term, irreversible (within five years) negative ecological impacts with a high risk of legal liability. $ A moderate incident is associated with a widespread or localised, medium-term, reversible (within five years) significant ecological impact and/or has a risk of legal liability. $ A minor incident is limited to the immediate area of occurrence associated with a short-term ecological disturbance, environmental nuisance or a transgression of an internal standard (including complaints from interested and affected parties) that does not result in any environmental impact after a once-off internal intervention.$ An environmental near-hit incident is one with no effect on the natural environment, but with the potential to cause an effect. There are two reporting systems in place for operations to report environmental incidents. The underground pipe mines (Finsch, Cullinan, Kimberley Underground and Koffiefontein) have an electronic data management system in place called IsoMetrix. Incidents are recorded and managed on an ongoing basis and are only recorded as closed once all allocated actions have been addressed.Williamson and the Fissure Mines have documented systems in place where the Chief Safety Officer on site keeps a record of any reported incidents. The Environmental Officer is responsible for ensuring that appropriate corrective action is taken when necessary. At the Botswana exploration operations, the reporting system consists of report back by exploration field staff. A formalised system is currently under development. During FY 2012 one moderate environmental incident was reported at Kimberley Underground, when a pump failure resulted in considerable amounts of slimes overflowing and eventually flowing into Paardebergvlei (a seasonal wetland on a neighbouring De Beers property). No rehabilitation work was required as the ecosystem for the vlei has not been affected, but should a future need be identified, Petra will work together with De Beers on this in the future.The incident was reported to the authorities as required by law and we are undertaking significant work to prevent similar incidents in future, including:$ creating additional capacity at pollution control facilities (sumps) and installing bigger pumps;$ installing a back-up power supply system to ensure that power failures will not cause such negative impacts in future; and$ inspecting the slimes lines at least once a day to check for leaks. Minor incidents recorded were mostly water pollution related incidents at Cullinan, Kimberley Underground and Star. We are taking steps to ensure that further discharges of contaminated water into water bodies do not take place. No fines or instructions were issued to Petra for environmental infringements during the Year.PerformanceResource usagePetra requires a range of natural resources across its mines. We recognise the importance of using resources responsibly and monitor our usage carefully, ensuring that materials are reused or recycled wherever possible.The main materials used at our operations are fuel, LPG, lubricating oils, steel and timber.Weight of materials used by weight or volume in FY 2012:OperationTimber(kg)Steel(kg)Fuel¹(litres)Gases²(kg)Lubricating oils (litres)Finsch n/a³n/a1,878,9080126,948Cullinann/an/a1,719,5992,009219,163Koffiefonteinn/a368,000921,491044,094Kimberley Undergroundn/a415,000413,34315315,572Helam134,576147,66184,957012,305Sedibengn/a167,000154,24628821,883Star463,30210,92055,178187,375Williamson7,650108,0002,145,552Cooking gas: 54011,250Gas welding: 14,073Group total605,5281,216,5817,373,27417,081458,590Notes:1. Figures expressed as a combination of diesel and petrol consumption.2. LPG only.3. Figures for certain materials usage at certain operations are not available.Recycling 2012Materials recycled in FY 2012:OperationMetal(t)Used oil(litres)Conveyorbelting(t)Tyres(number)Paper(kg)Cullinan95954,040323803,160Finsch46942,8987503,868Koffiefontein2860101,360Kimberley Underground33712,0356275978Helam790000Sedibengn/a20,400000Starn/an/a000Williamson4512,00001500Group total2,175141,3731148059,366