Rock strata ID

Lithology

Thickness/cm

Sand/kg

Gypsum/kg

Calcium carbonate/kg

Water/kg

Pulverized coal/kg

1

Coal seam floor

5

35.0

2.2

2.8

5.0

2

Coal seam

3

22.0

0.4

1.6

3.0

3

Soft rock 1

10

66.7

4.0

9.3

10.0

1.5

4

Key strata 1

10

64.0

4.8

11.2

10.0

5

Soft rock 2

10

66.7

4.0

9.3

10.0

1.5

6

Key strata 2

20

128.0

9.6

22.4

20.0