It shall see to it that the recovery rate and impoverishment rate in mining and recovery rate in ore - dressing meet the design requirements 矿山企业的一采回采率、采矿贫化率和选矿回收率应当达到设计要求。
Article 29 in the exploitation of coal resources , coal mining regulations must be complied with , the rational mining sequence followed and the rate of extraction set for exploiting coal resources achieved 第二十九条开采煤炭资源必须符合煤矿开采规程，遵守合理的开采顺序，达到规定的煤炭资源回采率。
The coal resources exploitation system should not only get the best economic effect but also improve resources stoping rate as possible as it can , protect environment and develop cyclic economy 摘要煤炭资源开采系统不仅要实现经济效益最大化，而且要最大限度地提高资源回采率，保护环境和发展循环经济。
Xinji no . 3 coal mine is a steep mine . it has reached pre - results by isolating the pillar with loosen blast technology in recovery area . the recovery rate is lifted and coal loss is reduced . it is an example for the same mine 新集三矿属急倾斜矿井，在回收区段隔离煤柱中应用松动爆破技术，达到了预期效果，提高了采区回采率，减少了煤炭损失，并为同类型矿井提供了经验。
Abstract : based on the actual state in fengshuigou coal mine , provides the technology ways of lifting coal extracion rate , which are reforming coal winning machine , reducing thickness loss , adjusting mining triangle coal , reducing area loss , reforming extraction process and extracting goaf 文摘:根据风水沟煤矿实际情况，提出了改造采煤机，减少厚度损失；调采三角煤，减少面积损失；改变回采工艺回收老塘等提高煤炭回采率的技术途径。
The investigation to the data ( at mineral resources reserves , output , consumption , sloping rate , etc . ) of exploitation of mineral resources and ecological environments quality offer the basic data materials in order to discern and study the sustainable utilization degree 2 本文对莱芜市各矿区进行矿产资源开发方面的数据(如矿产资源储量、产量、消费量、回采率等)调查与生态环境质量调查，为定性、定量的评价矿产资源持续利用程度提供基本的数据资料。
The conventional methods for mining such seams including the longwall blasting and block caving suffer form the drawbacks of being low in recovery , high in labor intensity and low in efficiency . after shifting to the use of the fully - mechanized extraction system by the zhaogezhuang branch mining industry co . of kailuan ( group ) co . , the mining of the pitching seams has met with remarkbable social and economic result 针对大倾角煤层长壁炮采、落垛等采煤方法,存在回采率较低、员工劳动强度大、高产高效受限及安全等诸多问题,开滦(集团)赵各庄矿业分公司在探讨大倾角煤层采煤工艺的改革及实践大倾角煤层综合机械化采煤过程中,取得了较好的社会经济效益。
The sustainable utilization evaluation of regional mineral resources this text regards laiwu ( in the middle of the shandong province , the east hillfoot of mount tai ) as a district of studying , so do maplnfo as workbench . by the present situation analysis of mineral resources , 19 indexes are chosen to form the evaluation system of the mineral resources sustainable development , they are fund tax rate , worker per capita incomes , rehabilitation rate , sloping rate , the ratios between reserves and extraction , tailing utilization ratios , atmosphere quality , water quality , economic - societies coordinate coefficient , etc . according to the experts , the quantitative indexes are quantified 2 、区域矿产资源可持续利用评价本文以莱芜市(位于山东省中部，泰山东麓)为研究区，以mapinfo为工作平台，通过对矿区矿产资源开发现状分析，决定选择资金利税率、职工人均收入、塌陷土地复垦率、采区回采率、储采比、尾矿利用率、大气环境质量、水环境质量、经济社会协调系数等19个因子，组成矿区可持续发展评价的评价因子，根据专家赋分值将定量因子进行量化，用模糊数学的方法对数据进行处理，使它们具有可比性。
