But these data-mining practices have begun to trouble some parents, who say they are concerned that education technology companies could potentially collect — and later share — sensitive details about, for example, a child's disciplinary record or a family's financial status.
The study shows that water infusion, face ventilation controls, water sprays, and deep and wet cutting in longwall shearer operations are commonly practiced in almost all underground longwall mines and that both Chinese and Australian longwall mine dust control practices have their own advantages and disadvantages.
The consolidation of lands and intensification of agriculture and mining practices, however, have eradicated many of these SNFs; this decline started in the 19th century and has accelerated in recent years.
An increase in its demand will require the development of mining practices that have minimal effect on the environment, such as properly dealing with waste, smart automation of mining operations based on data science and computer vision.
But with federal investigators saying they suspect that a buildup of methane and coal dust led to the explosion, the handling of the shaft seems a particularly egregious example of the mining practices that have set Massey apart from the rest of the coal industry.
The evolution of mine revegetation practices has seen the agronomic engineering approach of establishing "green" landscapes with introduced grass and pasture species (Dahl and Mulligan 1996) replaced by the re-establishment of native flora to create a self-sustaining ecosystem.
The document warned that inefficient mining and refining practices had squandered scarce mineral reserves and produced extensive emissions of radioactive residues, heavy metals and other contaminants.
"Getting to the Next System: Guideposts on the Way to a New Political Economy" In Sacred Mountains, Andrew R. H. Thompson proposes a Christian ethical analysis of the controversial mining practice that has increasingly divided the nation and has often led to fierce and even violent confrontations.
If the Obama administration stays the course, the Environmental Protection Agency's decision last week to revoke a permit for one of the nation's biggest mountaintop-removal mining projects could be the beginning of the end of a mining practice that has caused huge environmental harm across Appalachia.
