Research on the Extraction Technology of Gas-Integrated Working-Face in Close Coal Seam Mining in Permafrost Area

Table 1

Statistical table of the thickness of permafrost layer drilled in the NMT minefield.

Exploration line-number	The thickness of frozen soil (m)	Floor elevation of frozen soil (m)
29-90	84.25	3895.8
26-83	89.15	3780.0
25-85	53.20	3819.1
29-81	55.00	3829.5
ZK30-1	36.29	3823.9
ZK28-1	22.50	3851.9