In addition to our rigorous internal monitoring and auditing processes, the State Government's Department of Environment and Heritage Protection (DEHP) has independent access to all of Mount Isa's air quality monitoring network data.
DEHP regulates our performance and is responsible for ensuring we comply with the strict conditions of our Environmental Authority (EA), and all other relevant environmental legislation.
Interpreting the results
In line with our EA, we measure and track air quality in three ways:
- Short-term hourly results
- Daily average results
- Annual average results
The Copper Smelter Extension Project required revision of our environmental limits under our EA. Consistent with these revisions, we are committed to maintaining and demonstrating ongoing improvements in our performance.
Mount Isa Mines operates to percentile limits on our hourly and daily sulphur dioxide exposures and we have an annual average limit.
Percentile limits restrict the number of hours or days in a year where sulphur dioxide can exceed the specified value. We are targeting performance better than these limits to maintain compliance and minimise impacts to our community.