Purpose. To improve of the sub-level caving mining methods during deposits high-grade iron ores by applying a rational mode and intensifying ore drawing. Methodology. It included an analysis scientific literature, design documentation practice iron-ores in complex geomechanical conditions deep horizons mines, to establish formation fundamentally new foundations scientific-and-design solutions f...

Iron-bearing minerals are the most important interfering compounds that found with bauxite reserves. The element iron has adverse effects on applications, including use of in refractory soils. purpose this research is to investigate possibility removal from low-grade ores utilize them industries. For achieving purpose, tests were performed samples an alumina silica modulus 0.73. After determini...

Investigations on the chemical and microbial leaching of a Nigerian Iron-ore in sulphuric acid have been carried out. The influence of physico-chemical parameters such as acid concentration, temperature, particle size and stirring speed on the chemical dissolution of the ore was investigated. The dissolution rates are significantly influenced by the temperature and acid concentration while the ...

Sampling is an important tool for gathering information about mineral deposits, helping to estimate the ore grade, and has great relevance at any stage of a mining project, ensure reliable results consequently, project better planning. There are several errors which sampling exposed among them we can mention fundamental error (FSE). This cannot become zero as it related constitutional heterogen...

In order to solve the problems of a slow solving speed and easily falling into local optimization an ore-blending process model (of polymetallic multiobjective open-pit mines), efficient scheduling method based on multiagent deep reinforcement learning is proposed. Firstly, according actual production situation mine, optimal control for ore blending was established with goal minimizing deviatio...

During early phases of open-pit mining production planning many parameters are uncertain, and since the mining operation is performed only once, any evaluations based only on on average outcomes neglects the very real chance of obtaining an outcome that is below average. Taking into account also that operation costs are considerable and the mining horizon usually extends over several decades it...

Pseudonannolene spelaea n. sp. is the first strictly cave-dwelling species described for the family Pseudonannolenidae. It is found in iron ore caves in the Brazilian Amazon. The family Pseudonannolenidae is exclusively Neotropical and frequently found in caves of Brazil, from which 20 species are known. The new species is compared with its congeners and with related cave-dwelling species. The ...