Equation 4.1.8 Tier 1: global average method – post-mining emissions – surface mines..... 4.26 Equation 4.1.11 Tier 2: approach for abandoned underground mines without methane recovery and ... Equation 4Ap.3.1 (New) Fugitive GHG emissions from gasification processes ..... 4.156. Chapter 4: Fugitive Emissions . 2019 Refinement to the 2006 ...