173 longwall mining ppts view free download

173 longwall mining ppts view free download

Arial Times New Roman Wingdings Palatino Times Cascade Image Expert Picture Bitmap Image Microsoft Graph 2000 Chart Microsoft Photo Editor 30 Photo Slide 1 Slide 2 RESPIRABLE DUST TRAINING PROGRAM Slide 4 Sources of Longwall Dust Slide 6 Slide 7 Slide 8 Slide 9 Slide 10 Slide 11 Dilution reduces the ratio of the amount of dust in the air LONGWALL Longwall mining adalah metode eksploitasi yang di gunakan pada deposit yang datar tipis dan berbentuk tabular SYARATSYARAT 1 Bentuk dan Posisi Bentuk Deposit tabular Posisi Deposit Moderate 150900 m atau lebih untuk batubara dan 35 km untuk non batubara

longwall mining tareapptx minera naturaleza

longwall mining tareapptx minera naturaleza

LONGWALL MINING Overview In the method of secondary extraction known as longwall mining a relatively long mining face typically in the range 100 to 300m but may be longer is created by driving a roadway at right angles between two roadways that form the sides of the longwall block with one rib of this new roadway forming the longwall face IV DEFINITION PROCESS The one underground mining method that has the potential to rival surface mining in output and cost is block caving Block Caving is the mining method in which masses panels or blocks of ore are undercut to induce caving permitting the broken ore to be drawn off below If the deposit is overlain by capping or bounded by a hanging wall it caves too breaking into

ppt room and pillar dan longwall batubara iqbal

ppt room and pillar dan longwall batubara iqbal

Openpit mining also known as opencast mining is a surface mining technique that extracts minerals from an open pit in the ground Openpit mining is the most common method used throughout the world for mineral mining and does not require extractive methods or tunnels This surface mining technique is used when mineral or ore deposits are eral coal have recently converted to longwall mining Longwall mining is also scheduled to be installed at other large underground operations in the West For these reasons much of this chapter compares longwall mining with the dominant underground mining technology in the Westroomandpillar mining with continuous miners

longwall mining overview introduction underground coal

longwall mining overview introduction underground coal

LONGWALL MINING This method of mining has proven to be more efficient than room and pillar mining with a recovery rate of nearly 75 percent but the equipment is more expensive than conventional room and pillar equipment and cannot be used in all geological circumstances As mining continues roof bolts are placed in the ceiling to avoid ceiling collapse More technology automation and innovation are coming to room and pillar and longwall mining to meet your increasing challenges Presenters Nigel Goff Global Manager Longwall Projects and Sales Jim Haughey Product Director Room and Pillar Mechanical cutting in hard rock MC51

blockcavingmethodpptx block caving underground mining

blockcavingmethodpptx block caving underground mining

Longwall mining continues to be much safer than room and pillar mining While longwall production is approaching the levels of room and pillar mining the roof fall rate for room and pillar mining is significantly higher Dolinar and Bhatt 2000 fig 2 For this reason a number of the National Institute for Occupational Safety and Health In the US coal mining industry most spontaneous combustion fires occur in longwall or workedout gob areas In order to reduce the fire hazard caused by spontaneous combustion it is important to understand how ventilation and gob characteristics affect the spontaneous heating process Given the difficulty to conduct field tests in such an environment a computational fluid dynamics CFD study

longwall mining slideshare

longwall mining slideshare

Longwall mining is a highly mechaniz ed underground mining sys tem for mining coal It set of longwall mining equipment consists of a coal shear er mounted on convey or operating Enhancing Teaching and Learning Through Educational Data Authorization to reproduce this report in whole or in part is granted While permission to reprint this Apr 30 2010 Equipment for Longwall Mining Powered Face Supports Shearer Armored Face Conveyor Conveyor System Electricals Communication 32 CHOCK SHIELD SUPPORT 33 Powered Roof Supports Two legged 34 POWERED ROOF SUPPORT AT LONGWALL FACE Capacity 4x450 T to 4x800 T Thickness of 20 m to 35 m Weight 12 T to 20T Weight 15m

caving underground mining methods longwall

caving underground mining methods longwall

The mining automation market is expected to grow from USD 222 Billion in 2017 to reach USD 329 Billion by 2023 at a CAGR of 677 between 2017 and 2023 PowerPoint PPT presentation Oct 23 2014 Caving Underground Mining Methods longwall Sublevel caving Block caving 1 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

181 longwall ppts view free download

181 longwall ppts view free download

Mining Automation Market Opportunities Challenges and Trends Global Forecast to 2023 The mining automation market is expected to grow from USD 222 Billion in 2017 to reach USD 329 Billion by 2023 at a CAGR of 677 between 2017 and 2023 COAL MINE PLANNING DESIGNAVREDDY ADDLMANAGER The Singareni Collieries Company Limited Mining Methods Generally Coal is being mined by two main methods 1 Surface or Opencast mining 2 Underground mining The choice of method is largely determined by the depth thickness and no of coal seams geology of the coal deposit and other factors

the effect of longwall mining on surface subsidence

the effect of longwall mining on surface subsidence

longwall mining induces a generally uniform and contemporaneous surface subsidence that can be Technical terms used herein are defined in the glossary p 25 more accurately forecast than subsidence caused by roomandpillar mining The current state of Longwall mining is used in horizontal tabular deposits mainly coal while the others have applications in inclined or vertical massive deposits a lmost exclusively metallic or nonmetallic Because the exploitation openings are intentionally destroyed in the progress of mining the caving class is truly unique Rock mechanics principles are

preliminary study on design of longwall mining from final

preliminary study on design of longwall mining from final

longwall face cant exceed 10mgm3 however the shearing and caving operations can result in an instantaneous dust concentration peaking at about 1500mgm3 and 250mgm3 respectively Niu W et al 2008 2 6 Underground Water As the mining activities disturb the surrounding rock mass fracture and channels develop through Mine subsidence can be defined as movement of the ground surface as a result of readjustments of the overburden due to collapse or failure of underground mine workings Surface subsidence features usually take the form of either continuous or discontinuous Mine subsidence subsidence usually occurs gradually when it is concurrent with mining

longwall mining equipment

longwall mining equipment

Longwall mining is the most economical method for mining coal since it extracts a large percentage of the coal at a high extraction rate Removing a high percentage of the coal results in surface subsidence with large horizontal strains These effects are immediately noticeable and can cause damage to highways bridges and retaining walls Longwall mining is one of the common methods for extracting coal in various thickness of coal seams and is much more effective productive and safer than any other mining methods The productivity of longwall mining is potentially high because it is basically a continuous operation requiring fewer workers and allowing a high production rate to

pdf longwall top coal caving ltcc mining technologies

pdf longwall top coal caving ltcc mining technologies

Alan Rolando Macas Snchez Minado de Frente larga es una forma de minera subterrnea de carbn que se extrae una larga pared de carbn en un nico segmento tpicamente 0610 m de espesor Aug 08 2020 In this study the finite difference method FDM coupled with a discrete fracture network DFN was utilized to analyze longwall top coal caving LTCC behaviors The integrated FDMDFN model enabled the influence of the preexisting fracture

openpit mining definition anglo american

openpit mining definition anglo american

Longwall Mining Equipment Product Line Overview Roof Supports Customized Design Caterpillar is the world leader in longwall roof support technology In the early 1970s demanding mining conditions in German coal mines set the stage for extensive RD in roof support technology Steeply inclined coal seams both thick and The forces required at the support line to control strata deformation are supplied by a set of hydraulic legs acting between the base and roof canopy The hydraulic pressure to the legs are supplied from a power pack system which could be located remote from the longwall face or mounted on a Pantechnicon at the main gate end of the longwall face

chapter 11 mining technology

chapter 11 mining technology

Longwall mining is used in horizontal tabular deposits mainly coal while the others have applications in inclined or vertical massive deposits a lmost exclusively metallic or nonmetallic Because the exploitation openings are intentionally destroyed in the progress of mining the caving class is truly unique Rock mechanics principles are Glossary of Mining Terminology After Damp Gasses resulting from underground combustion normally carbon monoxide This is a loose term implying any fatal gas in a mine after an explosion or fire Air Shaft A vertical opening into a mine for the passage of air Airway Any passage in a mine along which an air current moves Some passages are

coal mining methodppt methods of mining mining methods

coal mining methodppt methods of mining mining methods

of mining figure 1 1 Other revolutionary developments included the replacement of drilling and blasting by conti nuous miners during the 50s and 60s and the rapid growth of longwall mining during the 1980s These technological changes were accompanied by equally dramatic developments in work organization government regulation and In longwall mining premining prediction of methane emission rate depends on a number of geological factors geographical factors and operational factors These same factors also can impact the selection of a specific degasification system This study proposes a principle component analysis PCA and artificial neural network ANN approach to predict the ventilation methane emission rates of US