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  • H BLASTING IN SURFACE EXCAVATION - Mining and Blasting

    Blasthole diameter (D): Generally, the cost of drilling and blasting decreases as hole diameter increases. The relation between blasthole diameter and face height is approximately: D = 0.001 to 0.02 H Burden (B) : This is the distance in metres from a blasthole to the nearest free face and has the following approximate relation: B = 25D to 40D Or B = 25D to 30D for hard rock B = 30D to 35D for ...

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  • Optimized design of drilling and blasting operations in ...

    1. Introduction. Mining activity is mostly represented by these four main operations: drilling, blasting, loading and hauling. For a proper mine planning and design, all of these operations need to be carefully planned in such a manner that can prevent extra loads such as operating costs, environmental footprints, etc. Amongst these operations, drilling and blasting are known as the pioneers ...

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  • Blast Hole Drilling: The Basic Process RPM Drilling

    Blast hole drilling is traditionally used wherever the mining company wants to explore the mineral composition or potential mineral yield of the area demarcated for their mining interests. Blast holes are thus a fundamental step in the exploratory mining process, and can be employed in both surface mining operations and underground mining operations to varying degrees with varying effects or ...

  • Blasting Techniques Used in Underground and Opencast

    Read this article to learn about the blasting techniques adopted in underground and opencast mines. Blasting Techniques Adopted in Underground Mines: Drilling Patterns in Stone: Drilling patterns, also called shot-hole patterns, are named after the type of cut holes used and the principal patterns are: ADVERTISEMENTS: (1) Pyramid cut or cone cut (2) Wedge cut (3) Drage cut . ADVERTISEMENTS:

  • BLASTING IN OHIO’S QUARRIES AND SURFACE COAL MINES

    quarries and 12 to 25 feet in surface coal mines, and blasting would be much more economical since less drilling and explosives would be necessary. Another common misconception associated with blasting is that significant fracturing occurs far below the bottom of a blasthole. In fact, most of the gas pressure forces created by the detonation of the explosive radiate outward along the length of ...

  • Excavation, Drilling Blasting Solutions - Divestec ...

    Excavation, Drilling and Blasting Solutions. At Divestic Mining Services we provide three key engineered and innovative steps of mining solutions for all opencast mining operations. Our personnel is efficiently trained and competent to ensure maximum production, safety and efficiency. Surface Excavation. At Divestec we provide open cast services to effectively remove topsoil and overburden ...

  • Surface Miner Wirtgen

    Mining raw materials and cutting routes without drilling and blasting. Surface Miners can mine raw materials such as coal, gypsum, salt, phosphate, bauxite or lime in open-cast mines. They mine commodities selectively, ensuring a high quality and optimum exploitation of the deposit. Surface Miners are also used to cut routes or lower tunnel floors. Centrally positioned underneath the machine ...

  • Coal mining - Choosing a mining method Britannica

    Surface coal mining generally involves the following sequence of unit operations: (1) clearing the land of trees and vegetation, (2) removing and storing the top layers of the unconsolidated soil (topsoil), (3) drilling the hard strata over the coal seam, (4) fragmenting or blasting the hard strata with explosives, (5) removing the blasted material, exposing the coal seam, and cleaning the top ...

  • Blasthole Drilling - Office of Surface Mining

    Drilling in this manner is necessary at large surface coal mines where overburden will be cast. Typically, angles range from 10 to 15 degrees on the back row and 20 to 23 degrees along the front row. Fugitive Dust and Drill-Cutting Controls Dust-suppression and crushed-rock-cutting collection systems are available on many drill-rig models to help control fugitive dust. Rubber skirts and water ...

  • Excavation, Drilling Blasting Solutions - Divestec ...

    Excavation, Drilling and Blasting Solutions. At Divestic Mining Services we provide three key engineered and innovative steps of mining solutions for all opencast mining operations. Our personnel is efficiently trained and competent to ensure maximum production, safety and efficiency. Surface Excavation. At Divestec we provide open cast services to effectively remove topsoil and overburden ...

  • BLASTING IN OHIO’S QUARRIES AND SURFACE COAL MINES

    quarries and 12 to 25 feet in surface coal mines, and blasting would be much more economical since less drilling and explosives would be necessary. Another common misconception associated with blasting is that significant fracturing occurs far below the bottom of a blasthole. In fact, most of the gas pressure forces created by the detonation of the explosive radiate outward along the length of ...

  • Coal mining - Choosing a mining method Britannica

    Surface coal mining generally involves the following sequence of unit operations: (1) clearing the land of trees and vegetation, (2) removing and storing the top layers of the unconsolidated soil (topsoil), (3) drilling the hard strata over the coal seam, (4) fragmenting or blasting the hard strata with explosives, (5) removing the blasted material, exposing the coal seam, and cleaning the top ...

  • blasting pattern in opencast iron mines

    ASK MINING: Blasting Practices at Open Cast Mines. Mar 02, 2012 Following are some important facts related to blasting practices in open cast mines:-1 Drilling: There are two major types of drilling techniques being used Down the Hole (DTH): It is used when the blast hole diameter varies from 100mm to 380mm and the depth of blast hole is 12-15m.

  • Drilling and blasting practices in Nevada's openpit mines

    “Blasthole drilling and initiation patterns in surface blasting, ” Explo- sives T oday , Series 2, No. 12, J une. Ash, R.L, 1963a, “The mechanics of rock breakage (Part 1),” Pit

  • opencast coal mining equipment

    Underground vs Surface Coal Mines: Is Deep Drilling. While underground mining requires an array of resources, equipment and financial backing, the method is best suited if the environment and coal potential harmonize Longwall mining accounts for 50 percent of coal mines in the world and is much safer than other methods of coal mining. 【Get Price】 Opencast coalminingatKrielColliery ...

  • Optmization of blasting parameters in open cast mines

    20/08/2016  Blasting is still dominant over mechanization in opencast mines. Drilling and blasting contribute 30% of direct cost of production , hence proper designed blasting patterns must be applied for optimal fragmentation of rocks to minimize the cost of production . it leads to an increase in economic efficiency for exploitation of mineral resource. Large fragments effect the loading and hauling ...

  • Wagon Drilling Machine Iron Ore Open Cast Mining

    Surface Mining Methods and Equipment. recover minerals, encompassing the specific mining methods of: • Open pit mining • Open cast mining • Quarrying of dimension stone • Highwall/auger mining Open pit and open cast methods employ a conventional mining cycle of operations to extract minerals: rock breakage is usually accomplished by drilling and blasting for . Cost Models of ...

  • Mining Specialists Drilling Blasting In South Africa ...

    Highpoint Opencast Mining Services is a mining concern specialising in drilling and blasting. The company was established in 2004 in Middleburg, Mpumalanga, where our head office is now situated. Through our innovative solutions and our significant experience in the industry, we have become a well-recognised and sought after contender in the drilling and blasting sector.

  • Blast optimization at Kriel Colliery J r n a

    Number 4 coal seam is extracted through surface and underground mining methods. The underground operation was started in 1975 and is currently divided into six mechanized sections. The opencast was commissioned in 1978 and consists of two dragline pits and a mini-pit. Project background General information on blasting operations This study was conducted in both Pit 5 and Pit 6. The overburden ...

  • Blasting In Open Cast Metal Mines

    5 surface strip coal mine blast design 5.1 introduction to explosives and blasting 3 5.1.1 blasting theory 4 5.1.2 explosives properties and types 6 emulsions 7 anfo 7 heavy anfo 7 . 5.7 cast blasting 59 adequate energy 60 burden velocity 60 mass-energy distribution 60 drill selection and blasthole inclination 61 . Blast Design and Assessment for Surface Mines and . This is a practical course ...

  • Wirtgen surface miners maximize coal output Agg-Net

    India’s Bhubaneswari opencast mine using seven 220 SM 3.8 surface miners to mine coal . INDIA’s extensive coal reserves are the country’s most important source of energy, covering about half of its primary needs. One of the country’s largest coal mines is the Bhubaneswari open-pit operation, near the town of Talcher, in the eastern Indian state of Odisha. Here, Indian company ...

  • Mining - Surface mining Britannica

    Mining - Mining - Surface mining: It has been estimated that more than two-thirds of the world’s yearly mineral production is extracted by surface mining. There are several types of surface mining, but the three most common are open-pit mining, strip mining, and quarrying. These differ from one another in the mine geometries created, the techniques used, and the minerals produced.

  • Blast optimization at Kriel Colliery J r n a

    Number 4 coal seam is extracted through surface and underground mining methods. The underground operation was started in 1975 and is currently divided into six mechanized sections. The opencast was commissioned in 1978 and consists of two dragline pits and a mini-pit. Project background General information on blasting operations This study was conducted in both Pit 5 and Pit 6. The overburden ...

  • Songozwi Opencast Mining and Logistics (PTY) Ltd -

    5. coal distribution division. 6. drill and blast operations. 4. coal transport department. 3. contract mining and plant hire division. 2.2 mining suppliers: ppe suppliers, projects to production and coal washing, motor metal industries.

  • Optimization of Blasting Parameters in opencast Mines

    CHAPTER 3: DRILLING AND BLASTING IN LARGE OPENCAST MINES 3.1 Drilling. 3.2 Blasting 3.3 Recent Advancement in Drilling and Blasting Techniques 9-22 23-29 30-40 CHAPTER 4: REVIEW OF OPTIMIZATION TECHNIQUES 4.1 General 4.2 Optimization of Mine Production System through Operation Research Techniques 41-45 45-48 CHAPTER 5: DEVELOPMENT OF BLAST

  • BLAST MANAGEMENT PLAN 2012 2015 - Vale

    Surface Blasting operations at the Complex must be conducted in accordance with the provisions of: - NSW Department of Planning Infrastructure - Project Approval, Integra Mining Complex - Coal Mine Health and Safety Act 2002 – (CMHSA 2002) - Coal Mine Health and Safety Regulation 2006 – (CMHSR 2006) - Work Health and Safety Act 2011 - Work Health and Safety Regulations 2011 - Explosives ...

  • Economic Evaluation of Drilling and Blasting on the ...

    an open cast coal mine, where 1 seam and 2 seam separated by a parting which is ± 600mm thick are mined. 1 seam was mined using the underground methods from 1926-1966. The inaccuracy of the old underground plans has a major effect on the drilling and blasting performance due to the fact that the pillars were never off-set. Landau Colliery mines two types of coal, thermal coal and ...

  • Key Contributors Mining Highpoint Opencast Mining

    To see who the key contributors are at Highpoint Opencast Mining Services visit our website. Drilling and blasting excellence beyond the surface. HOME; ABOUT. Qualifications; Key Contributors; DRILLING; BLASTING; GALLERY; VIDEOS ; NEWS ARTICLES; CONTACT US; HOME ABOUT - Qualifications - Key Contributors SERVICES DRILLING BLASTING GALLERY VIDEOS NEWS

  • 200+ TOP MINING Engineering Interview Questions and ...

    Fly rocks during opencast blasting is controlled by. muffled blasting. 10. While dealing with Misfire shot the relieving hole is drilled at a distance not less than 10 m. 11. As per CMR the recapping of rope is done once at least in every 6 months. 12. what is the maximum angle of fleet is permissible in winding as per CMR. 1.5. 13. a coal seam is said to be of degree III if rate of emission ...

  • Wirtgen surface miners maximize coal output Agg-Net

    India’s Bhubaneswari opencast mine using seven 220 SM 3.8 surface miners to mine coal . INDIA’s extensive coal reserves are the country’s most important source of energy, covering about half of its primary needs. One of the country’s largest coal mines is the Bhubaneswari open-pit operation, near the town of Talcher, in the eastern Indian state of Odisha. Here, Indian company ...

  • Wirtgen Surface Miner Technology Maximizes Output at ...

    At the open-cast mine, the company completely refrains from blasting and drilling – instead, BCML relies on the safe method of cutting the soft rock. Bairagi Sahu, Associated Vice President, BCML, is highly satisfied with the 7 machines: “When it comes to performance, the Wirtgen surface miners are simply the best on the market. At our mine, we sometimes cut up to 1,800 tons of coal per ...

  • Mining - Surface mining Britannica

    Mining - Mining - Surface mining: It has been estimated that more than two-thirds of the world’s yearly mineral production is extracted by surface mining. There are several types of surface mining, but the three most common are open-pit mining, strip mining, and quarrying. These differ from one another in the mine geometries created, the techniques used, and the minerals produced.

  • Optimization of blasting parameters in opencast mines

    Drilling and blasting are the major unit operations in opencast mining. Inspite of the best efforts to introduce mechanization in the opencast mines, blasting continue to dominate the production. Therefore to cut down the cost of production optimal fragmentation from properly designed blasting pattern has to be achieved. Proper adoption of drilling and blasting can contribute significantly ...

  • Wirtgen Surface Miner Technology Maximizes Output at ...

    13/05/2020  At the open-cast mine, the company completely refrains from blasting and drilling – instead, BCML relies on the safe method of cutting the soft rock. Bairagi Sahu, Associated Vice President BCML, is highly satisfied with the 7 machines: “When it comes to performance, the Wirtgen surface miners are simply the best on the market. At our mine, we sometimes cut up to 1,800 tons of coal per ...

  • Queensland's first Cat MD6250 drill arrives in Australia ...

    Mining > Surface-drilling; 24 July 2019 comments; share. Duncan Moore. Editor . Determining formation porosity permeability using borehole magnetic resonance. SPONSORED european geophysical services. How sonic drilling works. SPONSORED boart longyear. The delivery to Bluff Coal mine, east of Blackwater is the first drill of its kind to enter the territory for works in the open cut coking coal ...

  • Songozwi Opencast Mining and Logistics (PTY) Ltd -

    5. coal distribution division. 6. drill and blast operations. 4. coal transport department. 3. contract mining and plant hire division. 2.2 mining suppliers: ppe suppliers, projects to production and coal washing, motor metal industries.

  • Masama Coal Project - The first open-cast coal mine in ...

    The Masama coal project will be a conventional open-cast mining operation using trucks and shovels for the first 25 years of the mine life. The E, A, and AU coal seams in the West block are amenable for open-cast mining. Shallow underground mining method involving drill and blast operations will be carried out to extract the G and K coal seams ...

  • Constantia Blasting - Thinking Differently

    Constantia Blasting Contractors is a drilling and blasting company in the opencast coal mining industry and we have a unique skill set and knowledge of the operational and commercial expertise of

  • Key Contributors Mining Highpoint Opencast Mining

    To see who the key contributors are at Highpoint Opencast Mining Services visit our website. Drilling and blasting excellence beyond the surface. HOME; ABOUT. Qualifications; Key Contributors; DRILLING; BLASTING; GALLERY; VIDEOS ; NEWS ARTICLES; CONTACT US; HOME ABOUT - Qualifications - Key Contributors SERVICES DRILLING BLASTING GALLERY VIDEOS NEWS