pillar extraction drilling

Feasibility Study and Mining Measures on Coal Pillars Mining Under Surface River Water Body

地表河流水体煤柱回采可行性研究及开采措施

Gas Control in the Upper Corner of Working Face under Hard Roof

坚硬顶板条件下大采高小煤柱回采工作面上隅角瓦斯治理

Study on the Reclimaning of Fault Waterproof Coal Pillar in Mafang Mine;

马坊煤矿断层防水煤柱开采回收研究

Mine Pillars Mining with Small-scale Coal Mining Approach in Small Coal Mine

小型煤矿采用小进路采矿法的矿柱回采

Comprehensive Prevention and Control Technology of Goaf Water for First Coal Pillar Mining Face in Mining Dip Gateway

回采下山巷道煤柱首采面采空水综合防治技术

Exploration on Coal Pillar Recovery on Fully Mechanized Disk Area under Complex Conditions

复杂条件下综采回收盘区煤柱的探索

Principal Technology Study on Pillor Mining under the System of Room and Pillor Mining;

房柱式开采体系煤柱回收关键技术研究

Research on the Pillar Extraction in Erxiashan Mining Area of Suhaitu Coal Mine

苏海图煤矿二下山采区煤柱回收方法研究

Design of rational width of coal pillars in gateways in gently inclined shallow coal seams

浅埋缓斜煤层回采巷道合理煤柱宽度设计

Application of ZZS3800/15.5/25 Mechanized Supporter in Knife Column Recovery Coal Mining

ZZS3800/15.5/25综采支架在刀柱式回采遗留煤体回收中的应用

Spontaneous Combution and Firing Study on Air Return Workface of Steep Coal Seam with Pillar Mining Method in Shitun Coal Mine;

拾屯煤矿急倾斜煤层巷柱式回采面发火规律研究

pillar robbing

【采矿】回收矿柱法

Application of Roof Deep-hole Pre-splitting Blasting Technology While Working Face Crossing Coal Pillar

顶板深孔预裂爆破在回采工作面过煤柱中的应用

Second Mining under Isolated Pillar Left by Wedge-pillar Mining Method

刀柱复采跨隔离煤柱布置探索与实践

Optimization of the Design of Mining Area and to Mine Reasonably the Coal-Pillar of Mine Surface Plant;

优化采区设计 合理开采工业广场煤柱

Combin gateway and pillar with fully mechanized top cawing mining technology in steep inclined special thick seam

急倾斜较薄特厚煤层巷柱-综采放顶煤开采技术

Strike Coal Pillar Affected to Strata Pressure of Fully Mechanized Longwall Mining Face with High Cutting Height in Closed Distance Seam

走向煤柱对近距离煤层大采高综采面矿压影响

Theory and practice of integrated pillarless coal production and methane extraction in multiseams of low permeability

低透气性煤层群无煤柱煤气共采理论与实践