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A satellite analysis using TROPOMI data reveals that Australia's coal mine methane emissions are significantly under-reported. For the 2020 financial year, satellite estimates for six mining clusters—representing 79% of black coal production—were 40% higher than the national total reported by the National Greenhouse Accounts. The discrepancy is most pronounced in New South Wales, where fugitive emissions were found to be approximately twice as high as official reports in both 2020 and 2021. The report attributes some of this variability to the adoption of 'Method 2', a site-specific company-led estimation approach for open-cut mines that often results in lower reported emissions compared to state-based averages (Method 1).