The percentage of total tons of coal estimated to be recoverable from a given area in relation to the total tonnage estimated to be in the ground prior to mining. The estimated recovery factors generally are 50 percent for underground mining methods and 80 to 90 percent for surface mining methods. More precise recovery factors can be calculated by determining the total coal in place before mining occurred and the total coal mined in any given area.
proportion of oil or gas which is recovered from a reservoir
The percentage of total hydrocarbons expected to be produced from a reservoir, well or field over its entire production lifespan.
Ratio of recoverable oil and / or gas to estimated oil and / or gas in place in reservoir. Determined by a various factors such as reservoir dimensions, pressure, nature of hydrocarbons, and development plan. (see also Primary, Secondary and Tertiary Recovery.)
Fraction or percentage of the total quantity of a substance extracted under specified conditions. Gold, Loening, McNaught and Sehmi, 1987
The ratio between the volumes of oil and /or gas produced and produceable from a reservoir and the oil and/or gas originally in place.
The ratio of recoverable oil and/or gas reserves to the estimated oil and/or gas in place in the reservoir.
the amount of oil or as that can be recovered from a reservoir is considerably less than the total volume of hydrocarbons actually in place. Recovery factor is expressed as a percentage of the total reserves believed to be in place.
The percentage of oil or gas in place in a reservoir that ultimately can be withdrawn by primary and/or secondary techniques.
