Operational Energy Efficiency Achievements
During 2012 and 2013, we implemented 84 new energy efficiency initiatives which have delivered an annualized energy savings of nearly 348,000 GJ, representing a 2.1% annual reduction in our energy intensity compared with the energy we would have used without these initiatives. We have also saved 25,000 tonnes per year of CO2e as a result of these initiatives. The wide range of energy saving measures included:
- Optimized grinding process;
- Installed variable frequency drives on certain equipment to reduce energy consumption;
- Installed high-efficiency lighting at some of our mines and camps;
- Reduced haul idling at our mining operations;
- Initiated a global energy awareness campaign at all of our sites;
- Implemented heat recovery systems using waste heat from diesel engine – generator sets;
- Optimized the operation of power generation plants;
- Implemented a pilot Energy Management Information System (EMIS)
ENERGY EFFICIENCY RELATED PROJECTS
At Paracatu, we achieved improvements in energy intensity through operational process optimization at one of our plants. Through these improvements, we reduced energy intensity by 9% in this process area (by end of 2013) compared with the 2011 baseline and achieved annualized savings of 61,000 GJ in electricity consumption and 1.6 thousand tonnes of CO2e emissions.
Energy Management Dashboard
We also implemented a pilot Energy Management Information System (EMIS), which improves energy efficiency through better operational control and identifies additional possible improvements through capital investments. We will be reviewing the results of this program with the view to possibly replicating it at some other operating sites.
Effect on Intensity
* Reflects energy intensity reductions at one of the two Paracatu plants.
We achieved significant improvements in energy intensity through the installation of variable frequency drives in the milling process and the use of high-efficiency lighting. With the start up of the Dvoinoye mine in 2013, the Kupol mill began receiving Dvoinoye ore for processing. To accommodate the increased volumes of ore and new ore characteristics, improvements to the milling process were needed. Kupol took steps to increase capacity and optimize milling through the installation of new equipment and variable frequency drives in order to adapt the power demand according to process flow. The overall result was close to 10% in energy savings per tonne of ore processed after the upgrade and an expected annual reduction in our milling process of 16,000 GJ in electricity use and 3.7 thousand tonnes in CO2e emissions.
Effect on Electricity
UsE Intensity at Kupol
At our Tasiast operation, we self-generate electricity using diesel and heavy fuel oil (HFO). In 2013, we built a new central power plant with reciprocating engines with a 19 megawatts generating capacity. The new power plant enables us to produce power with 8-9% higher efficiency compared to the previous operation which had smaller multiple generators and were scattered throughout the site. We estimate that this project will result in annual savings of 65,000 GJ of fuel and 3.5 thousand tonnes in CO2e emissions.