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1. Underground Mining Methods 1.1. Classification of Underground Mining Methods Mineral production in which all extracting operations are conducted beneath the ground surface is termed underground mining. Underground mining methods are usually employed when the depth of the deposit and/or the waste to ore ratio (stripping ratio) are too great ...
This method accounts for the vast majority of all underground mining in the U.S. – and I believe globally as well, although I have not done that analysis. Examples of commodities mined by this method include coal, limestone, salt, trona, lead, and potash. Shrinkage stoping
Shrinkage stoping Ascending method of mining Advantages and Disadvantages Vertical Crater Retreat stoping Introduction Application Developmental sequence of stopes ...
Lecture 4 Underground Mining. Underground mining Underground mining methods used in many small mines around the world Shrinkage stoping is a short-hole mining method which is most...
The West Reef project consists of an underground mine with a production mine life of five years and a modified Bogoso processing plant. The maximum mill feed rate is set at 175,000 tonnes per annual (t/a), or a nominal 500 tonnes per day (t/d). The proposed mining method is traditional shrinkage mining with the application of modern rock
Underground Mining Methods: Engineering … Underground Mining Methods presents the latest principles and techniques in use today. Reflecting the international and diverse nature of the industry, a series of mining case studies is presented covering the commodity range from iron ore to …
Underground mining is the process of extracting minerals and ores that are located too far underground to be mined efficiently using surface mining methods. The primary objective of underground mining is to extract ore safely and economically while minimizing handling of waste rock. Typically, underground mine has less environmental impact.
27-02-2020· Shrinkage stoping is similar to the cut and fill method, except instead of filling each level to act as a support, the blasted, broken ore is left in the resulting space to act as a support for the next level. After all the levels are blasted, the ore is then removed. This underground mining method is a good option for steep ore bodies.
Shrinkage stoping may be termed a " classic" mining method, having been perhaps the most popular mining method for mos t of the past century . It has largely been replaced by mechaniz ed ...
Underground Mining Methods Backgrounder describing the mining method. Watch for key ideas that relate to the criteria set out in step 1 above. b)Pick one animation to watch a second time and reflect back on the mining method description you just read. In the …
30-12-2019· Underground Mining Methods Coal Mining Bord and Pillar Longwall Blasting galllery Metal Mining Unsupported Mining Room and Pillar Stope and Pillar Shrinkage Sublevel Supported Mining Cut and fill Stull Square set Caving mining Longwall Sublevel caving Block caving 3. Longwall mining method: • Complete removal of the entire seam in one operation .
Underground Mining Methods and Applications FIGURE 1.3 Post room-and-pillar mining mined out Numbers indicate sequence of extraction FIGURE 1.4 Step-room mining of inclined orebody Deposits with large vertical heights are mined in slices. Mining starts at the top below the hanging wall.
07-08-2020· The method may be used for ore mining in shrinkage stopes, for rising, and for underground SECTION 10 SHRINKAGE METHODS Mike Turner Australian Mining Shrinkage mining was a common stoping method prior to mechanised mining and the introduction of hydraulic fill.
4.3.2: Underground Mining Methods. Underground mining methods become necessary when the stripping ratio becomes uneconomical, or occasionally when the surface use of the land would prohibit surface mining. Underground methods are traditionally broken into three classes: unsupported, supported, and caving methods.
When correctly planned and executed, shrinkage mining is a very effectual technique for ore mining and underground construction. It is used where the hanging and footwalls of the excavation are strong sufficient to be self supporting, although artificial support like rock and cable bolts might be installed as shrinkage progresses.
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shrinkage stoping.pptx - Underground Mining Method Shrinkage Stoping Shrinkage Stoping is a mining method used for steeply dipping narrower ore bodies
12.4 Underground mining method •Shrink (Shrinkage) stoping-Applied to vertical or subverticaladvance of mining in a stope.-Broken ore used as both a working platform and temporary support.-Drilling & blasting ®ore extraction ®scaling & supporting.-30~35% of the freshly broken ore is drawn from the base of the stopeafter
02-11-2011· Choice of mining method Underground Mining Methods Soft rock Mining Methods Blast mining Shortwall mining Coal Skimming (or Sink and Float) method Hard rock Mining Methods Stoping 1) Room and pillar 2) Bench and Fill (B & F) stoping 3) Cut and Fill (C & F) stoping 4) Stull stoping 5) Square-set stoping 6) Shrinkage stoping 7) Long-hole Open stoping 8) Vertical Crater …
Underground Mining. Underground methods — unsupported, supported, and caving — are differentiated by the type of wall and roof supports used, ... In shrinkage stoping, mining progresses upward, with horizontal slices of ore being blasted along the length of the slope.
Australian Centre for Geomechanics Underground Mining Methods Mike Turner Shrinkage Methods Section 10, Page 3 10.1.1 INTRODUCTION In shrinkage stoping the ore is generally mined in horizontal slices, starting from the bottom and advancing updip. The hangingwall and footwall are supported by broken ore left in the mined out stope.
14-04-2021· The shrinkage stoping method is utilized to get back any steep ore bodies when the primary ore or rock is competent. A mine's huge production section is the perfect place for this method. This mining method is also known as a classic mining method as it was a smart mining tech for most of the time in the past.
SHRINKAGE STOPING MINING English II Students: TABLE OF CONTENTS • • • • • • • • • •1. 2. 3. 4. 4. 5. 5. 6. 7. 8.In...
SECTION 10 SHRINKAGE METHODS Mike. download Report . Comments . Transcription . SECTION 10 SHRINKAGE METHODS Mike ...