underhand overhand mining methods

Underground Mining Methods and Equipment

UNESCO – EOLSS SAMPLE CHAPTERS CIVIL ENGINEERING – Vol. II - Underground Mining Methods and Equipment - S. Okubo and J. Yamatomi ©Encyclopedia of Life Support Systems (EOLSS) 2. Strength of the hanging wall, footwall, and ore body. 3. Economic value of the ore and grade distribution within the deposit.

MSHA

Mining Methods Prior to 2010, both overhand and underhand cut-and-fill mining methods were used. In mid-2010, overhand operations were no longer used at the mine. The active mining areas were vertically separated by an approximately 200-foot thick sill pillar, between the 5700 and 5500 levels.

(PDF) Underground mining Methods

downward, combining the techniques of overhand and underhand stoping into a single approach. 1.4) Breast stoping Breast stoping is a method used in horizont al or near-horizonta l ore bodies ...

Topic 9: Mining Methods Part V

The mining method used will depend on the characteristics of the orebody, particularly thickness ... overhand and underhand ... underhand stoping is most suitable for steeply dipping ore bodies.[5]

Definition of underhand stoping

The working of a block of ore from an upper to a lower level; mining downward. The method is particularly suitable for narrow, highly inclined deposits. Synonym of: horizontal-cut underhand, underbreaking, underground milling See Also: underhand longwall Compare with: overhand stoping

Underhand cut and fill

Geological Setting. Underhand cut and fill is a versatile mining method; it can be used in orebodies of varying widths and dips, from vertically dipping to flat lying is most useful in ore where the wall rock or vein is unconsolidated and cannot be safely mined using traditional cut and fill.Underhand cut and fill has been particularly successful in rockburst-prone areas.

8.4.1a Cut and Fill Stoping | ABC 123: Testing Site / Course

8.4.1a Cut and Fill Stoping. Cut and fill is a very expensive method, but is very selective. You might predict the type of deposits in which it would be employed as the principal mining method. High value metalliferous ores such as gold or silver are often mined by this, and when the high-grade ore is in veins, the high degree of selectivity of this method is a real asset.

Rock Mechanics Investigations At The Lucky Friday Mine (In ...

Figure 3.-Schematlc of cut-and-flll mining methods. A, Overhand; B, underhand. 3 . 4 Rock bursts have also been traced to sources other than pillars, including slip along faults and shear failure of highly stressed wall rock (5). Unfortunately, these mech·

Influence of mining activities on the reactivation of a ...

 · As the underhand stoping method requires backfill with higher strength than the overhand stoping method, the cohesion and tensile strength are slightly increased with respect to backfill for the underhand mining method (Dirige et al. 2009), although it is presumed that the strength of backfill does not have a significant influence on results of ...

Major Mines & Projects

Most of the production mining will utilize the overhand long hole stope method, historically used at the Kiena Mine Complex. In cases where production mining is expected under previously mined and backfilled stopes, the underhand long hole stope method will be utilized. Long hole production stopes will be mined on a longitudinal retreat basis.

Assessment of current mining strategy J for steep reefs at ...

mining method in use was breast mining and it was considered inappropriate for mining steep reef8. To come up with a mining method best for Mine A a workshop was conducted on steep reef mining on 1 August 20058. Three mining methods were discussed9. These are breast, overhand and underhand mining methods. A decision had to be made as

Overhand stoping | Article about overhand stoping by The ...

overhand stoping. [ ′ō·vər‚hand ′stōp·iŋ] (mining engineering) A method of mining in which the ore is blasted from a series of ascending stepped benches; both horizontal and vertical holes may be employed.

Cut and fill

Cut and fill mining is a highly selective open-stope mining method considered ideal for steeply dipping high grade deposits found in weak host rock. Many variations of the general cut and fill technique exist, however this article will focus on overhand cut and fill. Overhand cut and fill evolved from square set stull stoping to provide ...

CN105822307A

The invention relates to the technical field of stoping methods and particularly relates to an underhand sublevel open stoping method. The underhand sublevel open stoping method comprises the following steps: firstly, arranging an ore block along the direction of an ore body and dividing the ore block into an ore room and an ore column; dividing the ore block into 3-5 sublevels in the vertical ...

Suitability of the overhand cut-and-fill mining method for ...

Abstract: Vein type carbon-rich graphite deposits found in Sri Lanka occur in metamorphic rocks as narrow steeply dipping veins. These graphite deposits are mined by underground mining, mostly by applying the overhand cutandfill method. Graphite mining at Bogala mines, Sri Lanka, is a unique example of narrow vein mining where the overhand cut-and-fill method is applied as the most …

overhand stoping / animation / stoping methods / metal mining

 · in this video i''ve discussed about the STOPING method i.e. OVERHAND STOPING method with interactive animation in metal mine.HOPE THIS VIDEO WILL BE HELPFUL T...

8.3.1: Room and Pillar Method | ABC 123: Testing Site / Course

Room and pillar mining is arguably the most important underground mining method in practice today. The majority of underground production comes from room and pillar mines, and the majority of underground mines, by number, employs the room and pillar method! ... underhand stoping. They are also showing some overhand stoping, but, to be honest, I ...

Appendix C Mining Methods

Underhand Benching This is a widely used method of benching where extraction proceeds from the top of an ore block downwards. Development requirements are identical to those for overhand benching, as discussed above. However, fill cannot be introduced because the fill would be undercut on each lower lift.

Types of Underground Mining Method Comparison

 · In some cases the benches in underhand or overhand stoping are called breasts, and the method breast stoping, but I believe that is not the usually accepted definition. Breast stoping, in the strict sense, is the only name applicable to the mining of a horizontal slice, such as the sill floor of a large overhand …

Lucky Friday | Hecla Mining Company

All production is by underground methods, which include both underhand and overhand mining. The coarse mill tailing is mixed with cement and used as backfill. Production is via ramps and transfers, and substantially utilizes jumbo drills, mechanized mining, and truck haulage to the Silver Shaft.

What is overhand and underhand mining?

 · Overhand cut and fill mining involves excavating a horizontal slice of an orebody, then filling the void with a backfill material - typically mine waste or rejects from the processing plant .

Underhand stoping method

 · Underhand stoping method 1. Neelesh Pandey B.tech mining (Vth sem) Aksu satna mp Welcome Metal mining method 2. #Underhand stoping Applicability:- ★ Ore strength -moderate to weak ★ Hanging wall & Footwall:-moderate to strong ★ Ore sorting;- Not possible in narrow steep ore body ★ Support:-required if Hanging wall is weak.

Design Spans – Underhand Cut and Fill Mining

man-entry methods such as underhand cut and fill to be implemented under greater controlled spans resulting in a safe and economic alternative to conventional cut and fill mining, (Mah, 2003). A database of twelve (12) underhand cut and fill operations was compiled as part of this project through mine visits. The operations were

Methods of Ore-Breaking

to the usual primary classification of the methods of stoping. They are:--1. Underhand stopes, 2. Overhand stopes, 3. Combined stopes. These terms originated from the direction of the drill-holes, but this is no longer a logical basis of distinction, for underhand holes in overhand stopes,--as in rill-stoping,--are used entirely in some mines ...

Different back fill materials used in underground mines ...

 · CRF can be applied in a cut and fill method for both the overhand and the underhand. The overhand does not require a higher strength CRF, and usually URF is used instead. While for underhand, the CRF must be properly designed and engineered as it should attain the strength properties to provide the back support while mining the ore beneath the CRF.

MINING METHOD OF THE WEEK

 · The method of underhand stoping in which the ore is drawn to the level above (Position B in the figure below), is called Cornish stoping. It finds application only when it is necessary to mine a lens of good ore below a level and it is not practicable or financially possible to do the necessary development to come up from underneath. Its disadvantages are the excessive cost of raising both ore ...

Equipment Mobile mechanical vein miner;

Evolution of the mining method Overhand cut and fill with hydraulic fill. The primary mining method employed at the Lucky Friday Mine since its inception has been cut and fill. Prior to the 1980s, overhand cut and fill with hydraulic sand backfill was used. Horizontal production levels were driven every 60 m (200 ft) vertically from the shaft,

3 Methods to Serve a Volleyball

* Perfect your underhand serve first, so that if you have a bad overhand serving day, you are always confident with that. * Try to remember to hit it with your palm. If it his the sides or your fingers, the ball is going to travel crooked. * You should be able to hear a solid …

Draft Final Summary of Issues Identified Through Scoping ...

 · A vertical, overhand mining method whereby most of the broken ore remains in the stope to form a working floor for the miners. Another reason to leave the broken ore in the stope is to provide additional wall support until the stope is completed and ready for drawdown.

Underhand Cut and Fill Mining as Practiced in Three Deep ...

DYWIDAG bolt method, which is used for cemented mill-tailings backfill reinforcement in most mines today. This method reduced the time and cost of preparing the stope for cemented backfill significantly and made the underhand method a viable alternative to traditional overhand mining methods for steeply dipping veins.

Underground Mining Methods

characteristics of the major mining methods. 1.3.2 Room-and-Pillar Mining Room-and-pillar mining is designed for flat-bedded deposits of limited thickness, such as copper shale, coal, salt and potash, limestone, and dolomite. This method is used to recover resources in open stopes. The method leaves pillars to support the

Design guidelines : underhand cut and fill cemented paste ...

Underhand cut-and-fill mining is a potential solution to these issues. Discussions with mine sites revealed the use of sill beams in underhand cut-and-fill mining is not optimized. Optimization in ground support, development of in-situ strength test, and revisions of design standards are desired.

Comparison of mining-induced seismicity within a footwall ...

orebody going up. In practice methods such overhand cut - and-fill and sublevel open stoping employ a bottom-up mining direction. In contrast, top-down miningstarts from the top of the orebody going down This is commonly . associated with undercut and fill, and underhand open stoping methods. For both mining sequences, stopes are mined out from ...