Action on lowering the emission intensity of metallurgical coal mining is critical to limiting the impact of the industry on global warming. The aim of Technical Guidance Documents (TGDs) is to assist members of the Steel Methane Partnership (SMP) in standardising reporting of methane emitted from their assets while establishing a performance framework and action plan that achieves a rapid reduction of methane emissions, in accordance with an agreed schedule and defined targets. This TGD is dedicated to methane emissions described under SMP source 5 ‘Drained Coal Mine Methane (CMM) – Vented’ and thus aggregates all underground drained methane in a coal mine that can be measured at point sources on the surface such as vents at methane drainage stations or at drained gas emission mitigation equipment.