Funding for this research was provided by:
Independent Research Projects of State Key Laboratory of Coal Resources and Safe Mining, CUMT (SKLCRSM15KF01)
Excellent Innovative Project fund from China University of Mining and Technology (2014ZY004)
Mining Education Australia Collaborative Research Grant Scheme (2015)
Article History
Received: 14 April 2018
Accepted: 6 June 2018
First Online: 16 June 2018