Depillaring with caving method of mining is a common practice in Indian coalfields and so the occurrence fall goaf area, which can be considered as boon disguise it allows wining coal from large reserves but this becomes curse just because its unpredicted occurrence. Various empirical statistical models are developed after idealization several complicated mechanisms they not able to predict roo...

Using Brinley plots, this meta-analysis provides a quantitative examination of age differences in eight verbal span tasks. The main conclusions are these: (a) there are age differences in all verbal span tasks; (b) the data support the conclusion that working memory span is more age sensitive than short-term memory span; and (c) there is a linear relationship between span of younger adults and ...

Based on both theoretical and practical experiences, the measures aimed at controlling emergency shutdowns of stopes have been highlighted. These are connected with rigid settlements powered complexes. In terms Western Donbas mines, there certain risks a shutdown stopping operations within zone primary roof caving. Thus, causes support may include following: layers main rocks hanging not timely...

The evolution of surface subsidence is an important focus of study above Molycorp, Inc.’s newest block cave at the Questa molybdenum mine near Taos, New Mexico. The case study compares mature glory hole subsidence over the Goathill Orebody and subsidence emerging in its earliest stage over the new D Orebody block cave. Subsidence above the D Orebody was first detected in April 2003, 30 months a...

The three-dimensional cuboids packing is NP-hard and finds many applications in the transportation industry. The problem is to pack a subset of cuboid boxes into a big cuboid container such that the total volume of the packed boxes is maximized. The boxes have no orientation constraints, i.e. they can be rotated by 90◦ in any direction. A new heuristic algorithm is presented that defines a conc...

A fracture expansion criterion of hydraulic fracturing was suggested to deal with the hard and stable roof control in coal mines. An experiment designed for control, reliability model verified. Four different types holes technology were setup room, a fully mechanized caving face implemented.