Reducing Diesel Particulate Matter has a direct impact on improving air quality and thus workforce health and safety. PT Freeport Indonesia has selected a multi-stage reduction strategy to reduce DPM emissions in its underground operations. This paper provides an update on challenges, success and lessons learned during the first two stages of the Emission Assisted Maintenance (EAM) program, including mobile equipment selection for trials and instrumentation used for tailpipe measurements. The first stage consists of various Diesel Particulate Filter (DPF) trials to measure the effectiveness and feasibility of a large scale roll out. Use of new engine technologies was trialed in the second stage. Additionally, the PT Freeport Indonesia's EAM program includes wet and traditional DPF cleaning stations and a Digital Data Management dashboard to control, monitor and measure success. Lastly, the paper summarizes the impact of high altitude in engine emissions and DPF life as well as providing insight regarding the opportunity to scale up the EAM program.
