This application is found in coal mines where two forms of gas may be produced. One gas is from microorganisms feeding off the coal, and the other gas is from gas deposits in the mines. By drilling into the coal mines, and locating sufficient gas deposits, the gas can be recovered through vacuum, depending on suction and discharge pressures at the well head. The gas, once recovered by the low-pressure vacuum, is then compressed by high-pressure compressors to a pipeline for processing or used for cogeneration, etc. Normally the methane gas recovered is very clean but significant quantities of liquids may be entrained in the gas. This gas is recovered for a number of uses, including cogeneration and gas plant processing for redistribution of sale.