Gas Content

The gas content in a seam is a major factor to consider when looking at outbursts. It affects the probability of an outburst and also the size of an outburst should one occur. A calculated estimation of the content of gas must be made in order to assess the mine ventilation requirements, drainage estimation and the drainage system design. The following pages discuss methods of estimating the content of gas in a particular region of a coal seam.

Direct Estimation

• Direct method

Indirect Estimation

• Analytical Method
• Volumetric Method
• Gravimetric Method

Probability Estimation

• Probabilistic Method