Comprehensive assessments of the need for additional methane control capacity beyond ventilation often require both an empirical and theoretical approach for an adequate or timely control of increased methane emission levels. Thus, the prediction of methane emissions and optimization of methane control systems prior to starting a new mining operation will be a major improvement towards eliminat...

Paste composite filling mining (PCFM) is one of the effective ways to achieve water-preserved (preservation waterproof strata). To investigate laws fracture propagation overlying strata in PCFM stope, a kinematic model was established, which identified major determinants development fractures. Taking 112,201 working face test mine as research background, physical similar simulation, numerical c...

Paleomagnetic poles and magnetostratigraphy were obtained from the late Carnian and early Norian Petrified Forest Formation, The remanent magnetization characteristics of this variegated claystones formation are correlated closely with stratal color; red strata display univectorial magnetizations directed to the origin of orthogonal axes plots between 300' and 630°C whereas progressively great...