China MOC:steel prices to keep low in China China Ministry of Commerce expects domestic steel prices to keep low in the near future amid the soft market demand and exces- sive reserves of steel plants. Steel prices fr...China MOC:steel prices to keep low in China China Ministry of Commerce expects domestic steel prices to keep low in the near future amid the soft market demand and exces- sive reserves of steel plants. Steel prices from November 10 to 19 fell by 2.7%,0.9% age point more than the drop rate of the previous week.展开更多
Economic development of coastal community in Kotabaru Regency has become strategic in the future. Kotabaru Regency is the geo-economic strategic position due to the position of Kotabaru region boundaries between Kalim...Economic development of coastal community in Kotabaru Regency has become strategic in the future. Kotabaru Regency is the geo-economic strategic position due to the position of Kotabaru region boundaries between Kalimantan Island and Sulawesi Island. Geo-economic strategic of Kotabaru should increase the coastal community welfare in Kotabaru Regency. The objective of the research is to evaluate economic characteristic of coastal community at mining area in Kotabaru Regency. The number of samples in this study is 50 respondents in each village who are in the mining area. The number of companies in the mining area is 17 companies. Data were collected by using questionnaires. The results show that economic characteristics have low category. Mining and plantation companies do not increase the economic conditions of the community. Research suggestions are： （1） to examine the potential and importance of economic empowerment model of coastal communities in the region both mining companies and plantations; （2） the important role of companies and local governments to work together in formulating a strategy for management of CSR （corporate social responsibility）, and social mapping to be done by the company in the preparation of the CSR program.展开更多
Pit limit design has,up to date,focused mainly on maximization of economic profit alone,with environmental and social issues largely ignored.This paper focuses on incorporating both environmental and social issues in ...Pit limit design has,up to date,focused mainly on maximization of economic profit alone,with environmental and social issues largely ignored.This paper focuses on incorporating both environmental and social issues in the pit limit design process and provides an approach to pit limit optimization that is in compliance with sustainable development.The case study demonstrates that ecological costs have a substantial down-sizing effect and social benefits have a substantial up-sizing effect on the optimal pit limit.When the ecological costs are factored in,the optimal pit limit is 37.5%smaller than the economically optimal pit limit.However,when the social benefits are factored in,the optimal pit limit is 48.3%larger than the economically optimal one.The overall optimal pit limit,with the economic profit,ecological costs and social benefits simultaneously considered,is a result of balancing conflicting goals of maximizing economic profit,minimizing ecological cost,and maximizing social benefit.展开更多
The paper presents the mining method for the close quarter coal seams with thin rock sheet, that is mining the low coal seam, recovering the top coal seam after putting down the roof rock of the low coal seam. Practic...The paper presents the mining method for the close quarter coal seams with thin rock sheet, that is mining the low coal seam, recovering the top coal seam after putting down the roof rock of the low coal seam. Practice has proved that in recovering the top coal outside the face width after the rock between seams falls naturally or is demolished, the technology is simple, easy to operate and does not make a great demand for technical equipment. In the process of recovering the top coal, the low seam support could not be affected seriously, and two seams mining could be coordinated. Compared with the individual mining method, this mining method can produce a better economic benefit.展开更多
文摘China MOC:steel prices to keep low in China China Ministry of Commerce expects domestic steel prices to keep low in the near future amid the soft market demand and exces- sive reserves of steel plants. Steel prices from November 10 to 19 fell by 2.7%,0.9% age point more than the drop rate of the previous week.
文摘Economic development of coastal community in Kotabaru Regency has become strategic in the future. Kotabaru Regency is the geo-economic strategic position due to the position of Kotabaru region boundaries between Kalimantan Island and Sulawesi Island. Geo-economic strategic of Kotabaru should increase the coastal community welfare in Kotabaru Regency. The objective of the research is to evaluate economic characteristic of coastal community at mining area in Kotabaru Regency. The number of samples in this study is 50 respondents in each village who are in the mining area. The number of companies in the mining area is 17 companies. Data were collected by using questionnaires. The results show that economic characteristics have low category. Mining and plantation companies do not increase the economic conditions of the community. Research suggestions are： （1） to examine the potential and importance of economic empowerment model of coastal communities in the region both mining companies and plantations; （2） the important role of companies and local governments to work together in formulating a strategy for management of CSR （corporate social responsibility）, and social mapping to be done by the company in the preparation of the CSR program.
基金The authors are grateful for the financial supports from the National Natural Science Foundation of China(Nos.52074061,51974060,U1903216)Northeastern University Doctoral Basal Research Fund,China(No.N2001006).
文摘Pit limit design has,up to date,focused mainly on maximization of economic profit alone,with environmental and social issues largely ignored.This paper focuses on incorporating both environmental and social issues in the pit limit design process and provides an approach to pit limit optimization that is in compliance with sustainable development.The case study demonstrates that ecological costs have a substantial down-sizing effect and social benefits have a substantial up-sizing effect on the optimal pit limit.When the ecological costs are factored in,the optimal pit limit is 37.5%smaller than the economically optimal pit limit.However,when the social benefits are factored in,the optimal pit limit is 48.3%larger than the economically optimal one.The overall optimal pit limit,with the economic profit,ecological costs and social benefits simultaneously considered,is a result of balancing conflicting goals of maximizing economic profit,minimizing ecological cost,and maximizing social benefit.
文摘The paper presents the mining method for the close quarter coal seams with thin rock sheet, that is mining the low coal seam, recovering the top coal seam after putting down the roof rock of the low coal seam. Practice has proved that in recovering the top coal outside the face width after the rock between seams falls naturally or is demolished, the technology is simple, easy to operate and does not make a great demand for technical equipment. In the process of recovering the top coal, the low seam support could not be affected seriously, and two seams mining could be coordinated. Compared with the individual mining method, this mining method can produce a better economic benefit.
