Abstract
Investigation method of underground methane gas is under development and only qualitative analysis is available so far. This paper presents the results of our study for the quantitative evaluation of underground methane gas, applying BAT Sampling System which was developed by B. A. Torstensson, Sweden. In our study, we 1) collected underground gas in an artesian, inactivated condition as is the condition in the ground, 2) quantitatively evaluated the concentrations of the gas both in water and air and 3) applied this sampling system to the underground work.
