Tenzing Pty Ltd is working with GeoGAS in the upcoming ACARP Project Modelling Uncertainty in Open Cut Fugitive Emissions Estimations. This project was commissioned by ACARP to examine the uncertainty in the National Greenhouse and Energy Reporting (Measurement) Determination 2008. Specifically, the project will focus on methods that provide for the determination and reporting of the actual gas-in-place (GIP) of CO2 equivalent (CO2-e) gas. The methods have to be sufficiently robust to withstand external auditing, demonstrate quality measurement and data management systems, and provide an estimate of uncertainty.