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Lecture 4 Underground MiningSlideShare
Underground mining Underground mining methods. Lecture 4 Underground Mining 1. Hassan Z. Harraz hharraz2006 yahoo 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.
Get PriceStudy on Protective Coal Pillar Size Design for Ultra High
· a large number of coal sources and complex underground mining conditions of Sihe Coal Mine as shown in Figure 2. Among them seam #3 was being mined on the east of line tower No. N143 N147 where seam #15 was on the east of N152 N157 and the north of N157 N167 (about 83.9 m distance above the seam #3 which had been mined).
Get PriceExtreme Multiple Seam Mining in the Central Appalachian
· seam Coal Mine Roof Rating (CMRR) values are typically in the mid 60 s. The depth of cover (H) ranges from 600-1 000 ft ( m). development cases and then as retreat mining cases. One of the mines is a two-seam operation with both seams being worked by the same operator. All mining has been development with no pillar recovery.
Get PriceFailure mechanism of the large‐section roadway under
TAI ET AL. ribs occur serious spalling which seriously affects the pro-duction. Similar problems could also be found at Tongxing Coal Mine Pingshuo Coal Mine Jialing Coal Mine etc Large-section coal roadway support under these mined zones in ultra-thick coal seam has become one of the influencing factors of ultra-thick coal seam mining.
Get PriceFailure mechanism of the large‐section roadway under
TAI ET AL. ribs occur serious spalling which seriously affects the pro-duction. Similar problems could also be found at Tongxing Coal Mine Pingshuo Coal Mine Jialing Coal Mine etc Large-section coal roadway support under these mined zones in ultra-thick coal seam has become one of the influencing factors of ultra-thick coal seam mining.
Get PriceLeading practices for assessing the integrity of confining
· International Mine Water Association Conference Bunbury West Australia 30 September4 October 2012 2 Methods Table 1 outlines a proposed approach for leading practice assessment of the integrity of confining strata (aquitards) for underground mining and coal seam gas extraction. The appropriate level of
Get PriceOptimization Research on the In-pit Haulage System
· Optimization Research on the In-pit Haulage System Development Under Open Pit and Underground Mining Conditions XIAO Cangyan1 GUO Liwen2 CHEN Shuzhao3 1College of Light Industry Hebei Polytechnic University Tangshan hebei 2College of Resource and Environment Hebei Polytechnic University Tangshan hebei 3China University of Mining and Technology Xuzhou Jiangsu
Get PriceUsing Ground Penetrating Radar for In-Seam Crack
· The mining face is designed to cut out the #1 seam. Failure to cut out this seam will result in loosening of a thin zone which will very quickly fail and fall. Above this layer is 0.71 metre of salt followed by another clay seam.
Get PriceSelection of an Appropriate Mechanized Mining Technical
Mechanized mining technical process (MMTP) related to the control method of the shearer is a vital process in thin coal seam mining operations. An appropriate MMTP is closely related to safety productivity labour intensity and efficiency. Hence the evaluation of alternative MMTP is an important part of the mining design. Several parameters should be considered in MMTP evaluation so the
Get PriceALABAMA MINE MAP REPOSITORY
· The majority of the maps were submitted by the respective mine operators in accord with the provisions of Alabama s mining laws. 1 ("Coal Mining Laws of Alabama" 105 and Giles 86). However there are a few maps in the repository which were provided by the Geological Survey of Alabama and a few others were provided by individuals.
Get PriceFACTORS RESPONSIBLE FOR VARIATION IN
· increase in seam thickness up to about 84 inches and then tended to level off somewhat for thicker seams Various explanations could be given as to why the productivity tends to level off somewhat for thicker seams. Given (1973) men- tioned that increased difficulty of mining very thick
Get PriceSelection of an Appropriate Mechanized Mining Technical
Mechanized mining technical process (MMTP) related to the control method of the shearer is a vital process in thin coal seam mining operations. An appropriate MMTP is closely related to safety productivity labour intensity and efficiency. Hence the evaluation of alternative MMTP is an important part of the mining design. Several parameters should be considered in MMTP evaluation so the
Get PriceDIRECTORY OF COAL MINES IN ILLINOIS
· (mine index 359) ceased operations in the early 1970s. A thick seam which may correlate with the Rock Island Coal was mined about 5 miles north of Braidwood. This was a coal that occurred in pod-like deposits that were very thick (8 to 10 feet) but would thin to nothing within ½ mile.
Get Pricemachinery for underground mining of thin seam gold
Mining Gold Underground Gold Quartz Veins In A Hard-Rock. Feb 10 2011 This type of mining gold underground is unusual with today s mechanized mining methods. This is a very small operation that produces between tons of ore each year and the ore grade variesget price
Get PriceUsing Ground Penetrating Radar for In-Seam Crack
· The mining face is designed to cut out the #1 seam. Failure to cut out this seam will result in loosening of a thin zone which will very quickly fail and fall. Above this layer is 0.71 metre of salt followed by another clay seam.
Get PriceInternational Practice in High Performance Underground
This paper provides an overview of the international state of the art with respect to underground coal mining methods used in seams of thickness greater than 4.5 m through a review of a selection of high performing thick seam mining operations around the world both Single Pass Longwall (SPL) and Longwall Top Coal Caving (LTCC).
Get PriceSystem Analysis and Simulation of Narrow Vein Mining
· The production cycle of the underground mine is very amenable to discrete-event simulation as proven by other research performed to date (Sturgul and Smith 1993 Vagenas et al. 1995 1996 1998 Corkal and MacKenzie 1999). The various mining activities drilling blasting mucking hoisting etc. can be broken down into individual
Get PriceExtreme Multiple Seam Mining in the Central Appalachian
· seam Coal Mine Roof Rating (CMRR) values are typically in the mid 60 s. The depth of cover (H) ranges from 600-1 000 ft ( m). development cases and then as retreat mining cases. One of the mines is a two-seam operation with both seams being worked by the same operator. All mining has been development with no pillar recovery.
Get PriceLecture 4 Underground MiningSlideShare
Underground mining Underground mining methods. Lecture 4 Underground Mining 1. Hassan Z. Harraz hharraz2006 yahoo 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.
Get PriceSystem Analysis and Simulation of Narrow Vein Mining
· The production cycle of the underground mine is very amenable to discrete-event simulation as proven by other research performed to date (Sturgul and Smith 1993 Vagenas et al. 1995 1996 1998 Corkal and MacKenzie 1999). The various mining activities drilling blasting mucking hoisting etc. can be broken down into individual
Get PriceFailure mechanism of the large‐section roadway under
TAI ET AL. ribs occur serious spalling which seriously affects the pro-duction. Similar problems could also be found at Tongxing Coal Mine Pingshuo Coal Mine Jialing Coal Mine etc Large-section coal roadway support under these mined zones in ultra-thick coal seam has become one of the influencing factors of ultra-thick coal seam mining.
Get PriceCHAPTER 11 Mining TechnologyPrinceton University
· face Mining Control and Reclamation Act of 1977 congressional interest in the study of deep underground mining technology shifted its principal focus from a concern for the pro-tection of surface resources to a concern for maximum economic recovery and the conser-vation of the resource. Lessees are required to mine all coal that can be
Get PriceApplication of highwall mining system in weak geological
· underground mining. In its basic application highwall mining is a technique utilized after an open cut portion of a reserve has been mined sometimes prior to the introduc-tion of underground mining (Seib 1993). In this system the coal seam is mined by remotely operated equipment such as an auger machine or a modified continuous miner
Get PriceHow Geoscientists are Making Potash Mines Safer CSEG
· Conventional underground potash mining in Saskatchewan occurs within a comparatively narrow 500 km long corridor running from the Saskatoon area to the southern border with Manitoba (Figure 1). This corridor roughly parallels the shallow northern sub-crop edge of the Prairie Evaporite salts which host potash deposits at depths of 925 to 1200m.
Get PriceLecture 4 Underground MiningSlideShare
Underground mining Underground mining methods. Lecture 4 Underground Mining 1. Hassan Z. Harraz hharraz2006 yahoo 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.
Get PriceMethod of underground mining by pillar extraction
· A method of sublevel caving and pillar and top coal extraction for mining thick coal seams includes the advance mining of rooms and crosscuts along the bottom of a seam to a height of about eight feet and the retreat mining of the top coal from the rooms crosscuts and portions of the pillars remaining from formation of the rooms and cross-cuts.
Get PriceCoal miningChoosing a mining method Britannica
2 days ago · Coal miningCoal miningChoosing a mining method The various methods of mining a coal seam can be classified under two headings surface mining and underground mining. Surface and underground coal mining are broad activities that incorporate numerous variations in equipment and methods and the choice of which method to use in extracting a coal seam depends on many
Get PriceOverburden Failure Associated with Mining Coal
We investigated differences of overburden failure induced by mining multiple seams in ascending and descending sequences under a large water body. A case study that involves mining in an ascending sequence was the Beizao coal mine which is under the Bohai Sea and one that involves mining in a descending sequence was the Cuizhuang coal mine which is under Weishan Lake. Using numerical
Get PriceThick seam coal mining and its ground controlScienceDirect
· In order to meet the needs for top coal caving mining in 20 m thick seam in the Tashan coal mine a special large height top coal caving mining shield was developed as shown in Fig. 12.14. The maximum and minimum heights are 5200 mm and 2800 mm respectively.
Get PriceCHAPTER 11 Mining TechnologyPrinceton University
· face Mining Control and Reclamation Act of 1977 congressional interest in the study of deep underground mining technology shifted its principal focus from a concern for the pro-tection of surface resources to a concern for maximum economic recovery and the conser-vation of the resource. Lessees are required to mine all coal that can be
Get PriceBauxite Extraction Costs Thin Seam Coal Mining
Coal Seam Modelling and Mine Plalnning Using Huntly East Mine is a thick seam mining operation The coal seam attains a maximum thickness of 24 metres and is a very weak to weak rock (UCS = 5-15 Mpg) .Underground mining of thick coal seams ScienceDirectThis paper reviews underground mining methods for total thickness of a thick coal seam in
Get PriceCoal seamEnergy Education
· A coal seam is a dark brown or black banded deposit of coal that is visible within layers of rock. These seams are located underground and can be mined using either deep mining or strip mining techniques depending on their proximity to the surface. These seams undergo normal coal formation and serve as a conventional coal resource.The reserves of coal are immense and are the largest of all of
Get Price(PDF) Underground mining MethodsResearchGate
Underground mining room-and-pillar mining of thick seams –"Benching" Different approaches allow either the top or bottom part of the seam to be mined out first.
Get PriceOverburden Failure Associated with Mining Coal
We investigated differences of overburden failure induced by mining multiple seams in ascending and descending sequences under a large water body. A case study that involves mining in an ascending sequence was the Beizao coal mine which is under the Bohai Sea and one that involves mining in a descending sequence was the Cuizhuang coal mine which is under Weishan Lake. Using numerical
Get PriceUnderground Mining Methods and Equipment
· UNESCOEOLSS SAMPLE CHAPTERS CIVIL ENGINEERINGVol. IIUnderground Mining Methods and EquipmentS. Okubo and J. Yamatomi ©Encyclopedia of Life Support Systems (EOLSS) Figure 1 Example layout of an underground mine An inclined shaft is excavated for transporta tion of personnel and supplies in addition to a
Get PriceFACTORS RESPONSIBLE FOR VARIATION IN
· increase in seam thickness up to about 84 inches and then tended to level off somewhat for thicker seams Various explanations could be given as to why the productivity tends to level off somewhat for thicker seams. Given (1973) men- tioned that increased difficulty of mining very thick
Get PriceHow Geoscientists are Making Potash Mines Safer CSEG
· Conventional underground potash mining in Saskatchewan occurs within a comparatively narrow 500 km long corridor running from the Saskatoon area to the southern border with Manitoba (Figure 1). This corridor roughly parallels the shallow northern sub-crop edge of the Prairie Evaporite salts which host potash deposits at depths of 925 to 1200m.
Get Price
