Trend in Output from Gassy Coal Mines having Degree II or III Seams in India (1956, 1961, 1966, 1971, 1976, 1981, 1986 to 2006) | ||||
Year | Gassy Coal Mines | Percentage of | ||
No. of Mines having Degree II or III or both II & III Gassy Seams | Output from Gassy Seams (in million tonne) | No. of Mines having Gassy Seams to Total No. of Mines having UG Workings | Output from Gassy Seams to Total UG Output | |
1956 | ||||
1961 | ||||
1966 | ||||
1971 | ||||
1976 | ||||
1981 | ||||
1986 | ||||
1987 | ||||
1988 | ||||
1989 | ||||
1990 | ||||
1991 | ||||
1992 | ||||
1993 | ||||
1994 | ||||
1995 | ||||
1996 | ||||
1997 | ||||
1998 | ||||
1999 | ||||
2000 | ||||
2001 | ||||
2002 | ||||
2003 | ||||
2004 | ||||
2005 | ||||
2006 |