Development program and its determining principles of a mine in transition from open-pit to underground mining
Based on the cases of determining development program of a mine in transition from open-pit to underground mining at home and abroad,development programs were categorized and four-principles were brought forward in this paper.Also,main ways on how to actualize the principles were discussed simply and chiefly,expected to give a certain guidance to mines practicing transition from open-pit to underground mining in the future.
Abstract The results of the Tennessee study and the recent Brookings consensus statement present a moment for the field to reflect collectively on the preschool evidence base writ large and on what should come next. In this brief commentary, I review the broader preschool literature and offer seven specific takeaways regarding what we know about public preschool programs and about how to improve them. I argue that making progress requires a pivot in the field to specifically how to create new high-quality programs and improve existing ones. I offer specific directions for policy, practice, and research aimed at guiding this pivot.