Table 5: The parameters of constant elements in geochemical characteristics.

Coal seam number B1 B2 B3 B4 B8 B9
CaO/(Fe2O3+CaO) 0.46~0.52
0.49
0.54 0.62 0.23~0.78
0.62
0.81 0.78~0.93
0.85