Question List the factors that affect the quantity of methane emissions during coal mining Using the information and data in Table 1 and 2 to calculate the monthly methane emissions at Mine 1 and 2 . Assume methane recovered is negligible and methane conversion factor equal to be equal to 0.67Gg/106m3 Table 1: Coal production from Mine 1 and 2 Mine12CoaltypeminedAnthraciteBituminousCalorificValue(MJ/kg)3423MiningmethodUndergroundSurfaceProduction(tones/month)3,0004,000 Table 2: Default emission factors for Tier 1 Type of mining Emission factor (m 3CH4/ tonne) Underground 25 Surface 2.0 2