This methodology provides specific revisions to the UNFCCC approved consolidated methodology ACM0008, "Consolidated methodology for coal bed methane, coal mine methane and ventilation air methane capture and use for power (electrical or motive) and heat and/or destruction through flaring or flameless oxidation." The revision includes the addition of project activities at abandoned/decommissioned coal mines, with the exception of flooded abandoned mines. The revisions to ACM0008 also include clear definitions of relevant terms – abandoned mine methane (AMM), flooded mine, and venting mine – to help assess project eligibility. The methodology provides an approach to determine the quantity of methane which would be released to the atmosphere by an abandoned mine in a given year which utilizes a hyperbolic emission rate decline curve.