Rare earths are increasingly being applied in high-tech industries, such as green energy (e.g. wind power), hybrid cars, electric cars, permanent high-performance magnets, superconductors, luminophores and many other industrial sectors involved in modern technologies. Given that China dominates this market and imposes restrictions on production and exports whenever opportunities arise, it is be...

In macroeconomics, GDP is one of the most important concepts and indicators. has always been common indicator national economic development in world. With environmental protection movement rise sustainable concept, it urgent to carry out resource accounting comprehensively reflect input development. Green gradually developed this context. The article introduces machine learning technology data ...

The particulate pollution in the open-pit coal mines of China is particularly severe winter. aim this study to understand characteristics matter (PM) winter and provide a basis for prevention control pollution. We took problem PM concentration at bottom Haerwusu Open-pit Coal Mine (HOCM) as research object. Dust monitoring equipment two measurement points different heights were positioned conti...

the first step in mining activities is rock excavation in both mine development and production. constant pressure for cost reduction and creating an improved/safe work environment for personnel has naturally resulted in increased use of mechanical excavation systems in many mining operations. also, mechanical excavation and mining is more compatible with automation, meaning possibility of reduc...

rajasthan is one of the main mineral potential state of india. during the last 30 years it has witnessed enormous expansion of mining industries, but mining of most of the minor minerals coupled with changing climate has posed serious problems to the environmental fabric in the state, apart from base metal beneficiation plants. groundwater is also being polluted day-by-day by effluents generate...

This paper is based on the open pit to underground mining practice of Daye Iron Mine. The influence mechanism between high-steep slope and non-pillar sublevel caving method is studied by using physical model test. Firstly, engineering geological properties of the choosing typical research section is analysed and generalized. Secondly, the system of open pit to underground mining is developing a...