The chemical and physical composition of the feldsparquartz sand-ore differ from location to location in a given open pit mine mine and the utilisation of the raw-ore, as well as its resale value will depend on these properties. Thus. a very important aspect of the operation is to determine quickly and accurately the properties of the sand at a given location. Laboratory methods are accurate bu...

Introduction: India with hard coal production of about 254 MT from about 550 nationalised mines in 1994-95 is the third largest coal producing country in the world after China & USA. The country with 16.4 percent population of the world has measure 6.8 percent share of proved world coal resources. Coalfield over an area of 4.37 million hectares out of the total land surface of 328.8 million hec...

There are many reasons to mine landfills. For example, metals are increasingly shifting location from the Earth’s crust through human society into landfills. These new mines are located closer to the market, in contrast to traditional mines in the countryside where the metals are deep inside the crust requiring huge amounts of energy to be extracted. In addition, metals in the landfill pose a p...

This study determined the learning benefit of correcting missed exam questions. The results show that in addition to exams being an assessment tool, they can also be used as a tool for student learning. The availability of this information will provide help considering design, development, and improvement of traditional assessment methods for student learning. Introduction and Objectives One of...

Coal is mined in every country which is mainly used to generate electricity. Thousands of mine workers were killed every year due to many disasters takes place inside coal mine. These accidents are caused mainly due to the leakage of poisonous gas [2] present in the mine. Especially developing countries face a poor safety system for mine workers. Hence it requires a safety monitoring system [1]...

Based on the actual needs of the Chinese national emergency rescue base in mining areas, and in order to effectively carry out emergency rescue in coal mine disasters, this article studies the response process of emergency rescue in coal mines, the analysis and calculation methods required in the relief work for mine disasters, the functional requirements of the integrated command platform and ...

Underground coal mining is a dangerous industry where the regulatory state may impose tradeoffs between productivity and safety. We recover the marginal tradeoffs using disasters near a mine as shocks that increase future accident costs. We find that in the second year after a disaster, productivity decreases 11% and accident rates decrease 18-80% for mines in the same state, with some evidence...

Coal seams ascending mining technology is very significant, since it influences the safety production and the liberation of dull coal, speeds up the construction of energy, improves the stability of stope, and reduces or avoids deep hard rock mining induced mine disaster. Combined with the Xiaoming ascending mining mine 4-1, by numerical calculation, the paper analyses ascending mining 4-1 fact...