Clients: Coffey Environments
Skills: Greenhouse
Date:  2012

The Simberi Gold Company (SGC) needed Papua New Guinea (PNG) Government approval to make operational changes to enable expansion of the open cut gold mine and processing facility on Simberi Island. The changes included the introduction of an 11 MW Heavy Fuel Oil (HFO) power station and an incinerator.

Coffey Environments needed a quick turn-around and reliable assessment that it could include directly in its EIS. Simberi island is approximately 9 kilometres wide and rises to over 300 metres in height. The island’s small size, steep terrain and proximity to the equator leads to complex meteorological conditions including extreme convective atmospheric conditions.

Katestone used the Weather Research and Forecasting model (WRF) to develop  local windfields for dispersion modelling. Katestone completed a detailed air quality impact assessment of the power station as well as calculation of changes in greenhouse gas emissions. The carbon impact was described in the context of PNGs non-Annex I status under the Kyoto Protocol.

In the absence of specific PNG air quality criteria, Katestone with the agreement of the PNG Government used Australian National Environmental Protection (Ambient Air Quality) measure guidelines to investigate the protection of sensitive receptor locations among Simberi’s 1,839 residents. Katestone demonstrated that the air quality standards would be met for all sensitive receptors and it recommended eleven strategies for reducing greenhouse gas emissions.


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  • Skills ‐ Dispersion modelling, Greenhouse gas, Meteorology