^plaboratory;
of;
Resource;
Survey;
and;
Research;
of;
Hebei;
Province,;
Hebei;
University;
of;
Engineering,;
Handan;
056038,;
China;
^pof;
Geological;
Sdences,;
China;
University;
of;
Mining;
&;
Technology,;
Beijing;
100083,;
China;