Outburst prevention schemes

Drilling work

(10⁵ m)

Construction time

(10³)

Investment

(10⁶ yuan)

Gas control cost

(yuan/t)

Prevention of secondary disasters

Scheme I

14.95

24.92

52.33

63.39

Average (75)

Scheme II

13.54

13.54

20.31

53.29

Better (80)

Scheme III

15.15

15.16

22.74

82.56

Good (95)