HVO 2009 Annual Environmental Management Report - Final

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Coal & Allied – Hunter Valley Operations During 2009 we introduced systems to ensure continued compliance with new Australian government legislation, completing assessments required by the Energy Efficiency Opportunities Act 2006 (EEO). HVO identified eight opportunities and three significant opportunities that will be assessed as part of the integrated business planning process A report of our declared EEO projects will be available at www.riotinto.com. The three significant EEO projects in 2009 were: Effective Dragline Deployment - Goat Island Goat Island is a 180 metre box cut that was to be excavated using truck and shovel operation. An opportunity now exists to access the area using a dragline rather than truck and shovel. This one-off, single opportunity results in both operating cost and energy savings. The savings result from reduced diesel consumption (due to reduced truck hours) which outweighs increased electricity consumption due to the dragline's operation. The project was identified as an opportunity in 2009. A business case is currently being developed to undertake the required work. Strip Design – Upper Liddell seam Specific mine planning for the Upper Liddell seam of coal extraction has indicated that a lower elevation of the pad (a key work zone) will result in a reduction of dozer time for each seam pass. The project was identified as an opportunity in 2009 and represents an annual efficiency improvement (from reduced dozer usage) for both cost and energy. This work is currently planned to progress in 2011. Install Hungry Boards to increase coal payload HVO proposes to install hungry boards on seven coal trucks which will potentially increase the payload from 201 tonnes to 213 tonnes. Increasing payload will improve the efficiency of moving coal and reduce energy costs. Currently, different trays are used for overburden and coal. This project will result in enhanced matching of truck-tray type to specific tasks. The project was included in the 2009 EEO list of opportunities but is unlikely to be progressed until at least 2011 dependent on the availability of capital to undertake the design, fabrication and installation of the required modifications. AEMR 2009 157
Coal & Allied – Hunter Valley Operations 3.24.2 Environmental Performance During 2009, HVO obtained energy from three main sources (1) electricity supplied through the state electricity grid, (2) two percent bio-diesel and (3) a comparatively minor amount of petrol. The breakdown of energy usage and respective GHG emissions from the use of electricity and diesel is displayed in Table 52 and Table 53 respectively. The total energy use for HVO is displayed in Table 54 and the total GHG emissions for HVO including coal seam methane gas emissions, explosives emissions and land management emissions are displayed in Table 55. Table 52: Electricity Energy Usage and Greenhouse Gas Emissions 2009 Electricity Consumption Energy Usage GHG Emissions Mining (MWh) Processing (MWh) Total (MWh) Total (GJ) 1 68,718 (50.4%) 67,627 (49.6%) 136,345 490,842 Mining (tCO2-e) 2 Processing (tCO2-e) 2 Total (tCO2-e) 2 61,159 60,189 121,348 1. This calculation was undertaken assuming that 1kWh is equivalent to 0.0036GJ. 2. This calculation was undertaken assuming that 1MWh is equivalent to 0.89tCO2-e. Note: Mining/Processing split is based on rough calculations by the CPP, with Mining approximately 50.4 per cent and Processing approximately 49.6 per cent. Same split used in 2005, 2006, 2007, 2008 & 2009. CNA have installed electricity meters on major fixed and mobile plant. Meters are being linked into the sites communication network where they will be used to improve understanding the breakdown of site electricity usage. Table 53: Diesel Energy Usage and Greenhouse Gas Emissions 2009 Diesel Consumption Energy Usage GHG Emissions B2 Bio-diesel Usage (kL) Diesel Usage (kL) Total (kL) Total (GJ) 1 1,427 69,981 71,408 2,750,641 B2 Bio-diesel Usage (tCO 2 -e) 3 Diesel Usage (tCO2-e) 2 Total (tCO 2 -e) 13 187,739 187,752 1. This calculation was undertaken assuming the calorific value of 1kL of diesel is equal to 38.6GJ and the calorific value of 1kL of bio-diesel is equal to 34.6GJ. 2. This calculation was undertaken assuming that 1kL is equivalent to 2.7tCO 2 -e. 3. This calculation was undertaken assuming that 1kL of bio-diesel is equivalent to 9kgCO 2 -e. AEMR 2009 158
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HVO 2009 Annual Environmental Management Report - Final

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