2010-2-1 · Unsupported methods of mining are used. to. extract. mineral deposits that are. roughly. This mining method is still finds occ asional use in mining high-grade ores or in countries .
Stoping is the process of extracting desired ore or mineral from an underground mine, leaving behind an open space known as stope. `Room-and-pillar mining is the most common unsupported method, used primarily for flat-lying seams or bedded deposits like coal, trona, limestone, and salt.
Unsupported Methods Room and Pillar mining. This method of mining is used to recover bedded deposits that are horizontal or nearly horizontal when the orebody and the surrounding rock are reasonably competent. Parallel openings are mined in the ore, i.e., rooms, and blocks of ore, i.e., pillars, are left in place to support the overlying strata.
2014-8-18 · Unsupported Methods: Sublevel stoping Supported Mining Methods: Cut and fill, Stull stoping, Square set stoping Caving Methods: Longwall Mining Method Caving Methods: Longwall Mining Method, concerns and issues Caving Methods: Shortwall Mining
The mining method used will depend on the characteristics of the orebody, particularly thickness and dip, and the competency of the surrounding rock. Supported and Unsupported underground
2017-8-14 · a single method among surface methods (especially open-pit), supported, unsupported, or caving underground methods. This study represents a procedure with an accurate and reliable way in relation to identify the priority of consideration between the problems of mining method
2020-8-25 · Keywords: Mining method, underground mining, room-and-pillar mining, sublevel stoping, cut-and-fill, longwall mining, sublevel caving, block caving, backfill, support, Of the unsupported methods, room-and-pillar mining is employed for extraction of flat-dipping and tabular deposits, whereas shrinkage and sublevel stoping are applied to
2021-1-11 · Its use as a control method is limited, as the rock surface between the straps remains largely unsupported and blocks still may fall out. 2.3.3 Shotcreting There are two types of shotcrete application wet mix and dry mix. Each method has its particular use in surface rock support.
2011-11-2 · Lecture 4: Underground Mining 1. Hassan Z. Harraz [email protected] 2010- 2011 This material is intended for use in lectures, presentations and as handouts to students, and is provided in Power point format so as to allow customization for the individual needs of course instructors.