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Site characteristics of study sites
| Elapsed time | Coal Mine | Area | Altitude | Direction | Slope | Topography |
|---|---|---|---|---|---|---|
| Year | m | ° | ° | |||
| 1 | Dongwoo Sungjin (1) | Yeongwol-gun | 813 | N 15 E | 30 | Slope |
| 3 | Dongwon (1) | Jeongseon-gun | 900 | N 40 E | 33 | Valley-Slope |
| 4 | Samtan | Jeongseon-gun | 940 | S 40 E | 35 | Slope |
| 5 | Saewon | Jeongseon-gun | 945 | N 35 E | 28 | Slope |
| 6 | Dongwoo Sungjin (2) | Yeongwol-gun | 1,120 | S 15 E | 35 | Slope |
| 7 | Dongwoo Saebang | Yeongwol-gun | 900 | N 40 E | 33 | Valley-Slope |
| 8 | Dongwon (2) | Jeongseon-gun | 912 | N 40 E | 32 | Valley-Slope |
| 10 | Hanil | Yeongwol-gun | 670 | N 20 W | 22 | Valley-Slope |
| 11 | Jungdong | Jeongseon-gun | 650 | N | 10 | Plate |
| 14 | Hambaek (1) | Jeongseon-gun | 565 | S 40 W | 35 | Slope |
| 17 | Hambaek (2) | Jeongseon-gun | 560 | S 25 W | 33 | Slope |