Low-carbon credentials for Lake Hope

Impact is aiming to reach full decarbonisation of Lake Hope.
Impact is aiming to reach full decarbonisation of Lake Hope.

A preliminary study into the potential carbon dioxide emissions from Impact Minerals’ (ASX: IPT) Lake Hope high purity alumina (HPA) project in WA show Scope 1 and 2 emissions will be significantly lower than competing processes that produce HPA.

The low emissions apply to both sulphate and low-temperature-leach (LTL) processes that are being considered by Impact to produce HPA as part of the pre-feasibility study for Lake Hope.

The emissions study showed that using WA’s current electricity supply, likely emissions are 4.38t of carbon dioxide per tonne of HPA produced via the sulphate process and 3.44t of carbon dioxide per tonne of HPA for the LTL process.

This is on par with or lower than competing processes globally.

The largest contributor to the overall carbon dioxide emissions from Lake Hope comes from the Scope 2 emissions from the electricity required to power the processing plant.

Power for the processing plant will come from the South West Interconnected System (SWIS), WA’s main power source and is currently coal-powered.

Impact is aiming to reach full decarbonisation of Lake Hope over time, with the process requiring the elimination or off-setting of the emissions from the SWIS as well as from mining, transport and calcining.

Mining and transport emissions will require the deployment of low-carbon fuels and hydrogen-powered or electric vehicles for mining equipment and long-distance haulage.

Impact will continue to develop its understanding of the prospective emissions of Lake Hope and the technical barriers to achieving net-zero carbon HPA by:

  • Eliminating SWIS connection to avoid importing carbon dioxide from the grid
  • Purchasing 100% renewable energy
  • Investigating owner installation of renewable energy where appropriate
  • Electrifying the mining plant and equipment where available
  • Monitoring electric calcination technology developments and maturity
  • Purchasing carbon offsets