
However, through recent renegotiation and early termination of our fossil fuel based electricity supply contracts, from 2022 we will be moving to 100% renewable power sources at Escondida, reducing both our unit power costs and our energy carbon footprint. The shift to desalinated water supply has meant an initial increase in electricity use, associated costs and Scope 2 greenhouse gas emissions.
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Through a series of initiatives, we have substantially eliminated the use of groundwater, ceasing all pumping from the high Andean aquifers for operational water supply purposes. When those energy sources are fossil fuel based, any increase in energy usage also has an associated increase in greenhouse gas emissions.Īt Escondida, operated by BHP in the Atacama Desert in Chile, we are soon to break the usual downsides of the water-energy nexus. Reducing fresh water use from local groundwater or surface water supplies at a mine and replacing it with more sustainable desalinated seawater or treated and recycled water usually requires using more energy. Water and power are two of the biggest inputs in any mining operation and there is often a sustainability tension between the two.
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