Service Risk Evaluation of the General Contract for Coal Mine Production and Operation: Case Study at Shendong Jinjie Coal Mine in China

Table 3

Risk probability classification standard.

Level	Description	Probability
1	Improbable	Once every ten years or more
2	Remote	Once every five years-ten years
3	Rare	Once every five years
4	Probable	Once a year
5	Frequent	Multiple times a year