Table 5 Relationship between overburden’s typical \(\overline{{{\text{GSI}}}}\) values and rock stiffness.

From: A new indicator for estimating the degree of mining-induced land subsidence: the overburden’s average GSI value

Overburden’s typical \(\overline{{{\mathbf{GSI}}}}\) value

Overburden type

Rock stiffness

75

Very good quality

Hard; medium-hard; soft

50

Average quality

Hard; medium-hard; soft

30

Very poor quality

Hard; medium-hard; soft; very soft

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