| Year | Mine | Total | |
| Dolet Hills | Oxbow | ||
| 1985 | 392,815 | - 0 - | 392,815 |
| 1986 | 2,067,867 | - 0 - | 2,067,867 |
| 1987 | 2,750,652 | - 0 - | 2,750,652 |
| 1988 | 2,889,489 | - 0 - | 2,889,489 |
| 1989 | 2,879,806 | 102,753 | 2,982,559 |
| 1990 | 2,746,096 | 440,093 | 3,186,189 |
| 1991 | 2,740,733 | 410,015 | 3,150,748 |
| 1992 | 2,653,455 | 553,950 | 3,207,405 |
| 1993 | 2,643,806 | 460,099 | 3,103,905 |
| 1994 | 2,697,322 | 765,817 | 3,463,138 |