Then, a novel frequency ratio data mining ensemble model (FREM) was introduced and evaluated.
However, there may be some flexibility in panel orientation, panel width to depth ratio, and mining advance rate to control surface deformations and optimize CMR planning.
The knowledge of the orebody geometry, character of the contact zones, internal structures and distribution of inclusions could directly influence pit wall stability (thus strip ratio), underground mining method selection, dilution, treatability, and the dewatering strategy.
Based on the measurements, the optimal mixture is determined as substituting natural sand with 30% mass ratio of mining tailings, which enables structures achieve a favorable buildability and a relatively high mechanical strength.
The study is based on a comprehensive analysis of factors affecting the displacement factor, such as mechanical properties of the cover rock, the ratio of mining depth to seam thickness, dip angle of the coal seam and the thickness of loose layer.
Historically, the ratio of underground mining to open-pit mining has been approximately even, but as usable deposits close to the surface become scarcer, underground mining will probably increase.
Considering the extremely high silicon to aluminum (Si/Al) ratio for the mine tailings, class F fly ash is used to adjust the Si/Al ratio.
The effects of mass ratio among phosphate mine tailings, soft interlayer content and black shale and calcination parameters, such as preheating temperature, preheating time, sintering temperature and sintering time, on the properties of the ceramisite were investigated through single factor experimental testing.
The analysis results showed that comprehensive pullman's thickness of overburden strata, disturbance coefficient, mining thickness ratio and etc. are the key influence factors to the mining subsidence.
As a result it was observed that lead mine waste aggregates do not absorb as much radiation as barite aggregates depending on the ratio increase of lead mine waste in the aggregate added to the concrete mixture.
