drilling blasting hard line surface mining

Blaster's Training Modules - Module 3 - Surface - Blast ... - OSMRE

headings and stopes; however, it is is not widely preferred over presplitting in surface mining. “Line drilling” provides a plane of weakness to which a primary blast may break; it may also protect a highwall by reflecting some of the shock wave created by a blast. This plane of weakness is created by drilling a line of closely...

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Surface Mine Blasting - OSMRE

application of explosives in mining. Re- searchers combine an understanding of the basic principles of dynamic rock fragmen- tation with new blast design technology and recent developments in both methods and equipment, for potential improvements in blasting practices. This paper out- lines surface mine blasting...

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Mine Blasting & Explosives Technology, and Safety Regulations ...

Introduction; Blasting in Surface Mines; Blasting in Underground Mines; Controlled Blasting; Secondary Blasting; Non-explosives Rock Breaking; Blasting ... The second technique, known as pop-shooting, is to drill a hole into the block and fire a small charge in this hole, which is usually stemmed with quarry fines."...

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Rock blasting for mining - SlideShare

Jul 28, 2017 ... In mining operations, blasting has become a routine work. With proper understanding of the rocks and blasting methods, the mining work can be done effective…

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optimization of blasting parameters in opencast mines - ethesis@nitr

Certain empirical rules are followed for this spacing and the depth of holes as indicated below (Dey,. 1995). For hard rock: 1 : 4. Where 1 = horizontal space, 4 = vertical drill depth. For loose material: 1 : 6 ratio. 3.1.1 Classification of Drilling Systems. Drilling machines used in surface mining projects, construction work, etc.,...

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SURFACE MINE BLAST DESIGN AND ... - OhioLINK ETD

Single row open with progressive time delay ........... 75. Single row open with alternating time delay ........... 76. Multiple row open V-cut with square corner ............... 77. Multiple row ... The methods of blasting overburden in surface coal mines vary with the ... drilling pattern, grade and type of explosives, and the loading and...

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OPTIMIZATION OF BLASTING PARAMETERS IN OPENCAST MINES

Certain empirical rules are followed for this spacing and the depth of holes as indicated below (Dey,. 1995). For hard rock: 1 : 4. Where 1 = horizontal space, 4 = vertical drill depth. For loose material: 1 : 6 ratio. 3.1.1 Classification of Drilling Systems. Drilling machines used in surface mining projects, construction work, etc.,...

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Rock fragmentation control in opencast blasting - ScienceDirect

In opencast mining, where blasting is employed for excavation, the overall cost effectiveness of the production operations is compatible with optimization of drilling and blasting parameters. Rock fragmentation depends upon two groups of variables: rock mass properties which cannot be controlled and drill-and-blast design...

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Drilling and blasting - Wikipedia

The most commonly used explosives in mining today are ANFO based blends due to lower cost than dynamite. Before the advent of tunnel boring machines, drilling and blasting was the only economical way of excavating long tunnels through hard rock, where digging is not possible. Even today, the method is still used in...

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Chapter 1 INTRODUCTION Blasting is the most ... - Shodhganga

of which the direct cost of explosives is about 5 % In hard rock mining, the cost of drilling and blasting is ... The primary objective of blasting at surface mmes is to create a well fragmented muckpile suitable for the ... railway lines, public roads and other surface structures Blasts were designed and implemented in these mines...

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High Sierra Blasting

Services. Contact High Sierra Blasting for all of your rock drilling and blasting needs, anywhere in the Western United States. We handle residential and ... We're fully insured for surface mining, residential, and commercial blasting; licensed and trained in the handling and use of explosives. High Sierra Blasting is committed...

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Drilling as an art form: complex surface ventilation raise - Boart ...

Sep 28, 2017 ... He blasted the remaining drill holes to the full design of the ventilation raise. No damage was sustained to any of the high-voltage power lines and surface installations which were in close proximity to the surface collar location and the blasting was completed without delays to the underground mining.

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New trends in drilling and blasting technology: International Journal ...

The mining industry is poised on the threshold of some exciting opportunities. It has been realized that the unit operations such as drilling, blasting, excavation, loading, hauling and crushing are interrelated variables in the total cost equation. The development, advancement and utilization of the innovative technologies are...

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Blast optimization at Kriel Colliery - University of Pretoria

Mine background and general information. Kriel Colliery (Anglo Coal) is situated on the northern margin of the Highveld Coalfield area in Mpumalanga, 55 km south of Witbank. The. Number 4 coal seam is extracted through surface and underground mining methods. The underground operation was started in 1975.

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selection the optimal parameters of drilling and blasting operations ...

Ibar Mines - Baljevac. **. Faculty of Technical Science, Kosovska Mitrovica. 1 INTRODUCTION. Blasting is a part of overburden excava- tion technology in the field .... the least resistance line is the shortest distance from the center of placement of explosive charge in the bore- hole to free surface. With inclined boreholes,.

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A Case Study Examination of Two Blast Rounds at a Nevada ... - CDC

Nov 7, 2006 ... majority of metal and non-metal mines use drill and blast techniques for drifting and primary ... assessing blast-induced damage in underground mines and discussed the feasibility of improving ground ... Accessed from a portal, it lies at depths ranging from 140 to 300 m (450 to 1000 ft) below surface.

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Assessment and Application of a Single-Charge Blast Test at ... - CDC

blast test conducted by Swedish researchers in iron ore at the Kiruna Mine in northern. Sweden are presented. They are ... Methods, such as line drilling, presplitting, cushion blasting, fracture control ... The main level lies 1,045 m below the surface and mining takes place between the 775- and 1,045-m levels. The mine...

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Requirements Applicable to Surface Coal Mines - Xinhaiia Law

The operation, inspection, operating condition and movement of drilling equipment and machines to protect the health, safety and property of miners and the general public. B. The Chief shall not promulgate any rule or regulation establishing requirements for the operation of, or conditions at, a surface coal mine which are...

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Glossary of Mining Terms - RocksandMinerals.com

Contour — An imaginary line that connects all points on a surface having the same elevation. Conventional mining — The first fully-mechanized underground mining method involving the insertion of explosives in a coal seam, the blasting of the seam, and the removal of the coal onto a conveyor or shuttle car by a loading...

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Blasted: Homeowners near mine seek recourse for property damage ...

Feb 18, 2016 ... When he built the addition, Jerry Kirk found that the beams were so well-seasoned that he couldn't drive a nail through — he had to drill holes and fasten bolts to the timbers instead. The house was in good shape, the Kirks maintain, until blasting from nearby surface coal mining started in 2007.

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Coal mining - Choosing a mining method | Britannica.com

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...

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P&Q University Lesson 4- Drilling & Blasting | Pit & Quarry

Jun 26, 2015 ... This Pit & Quarry University lesson focuses on drilling and blasting.

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total cost optimization for contour blasting in the ... - UKnowledge

This Master's Thesis is brought to you for free and open access by the Mining Engineering at UKnowledge. It has been ... KEYWORDS: Contour Blasting, Control Blasting, Blast Optimization, Drill and Blast,. Total Cost ...... done for blast improvements and optimization, especially in the surface coal mines, for the most part...

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Rotary Drilling and Blasting in Large Surface Mines - CRC Press Book

Feb 28, 2018 ... In this unique reference volume, rotary blasthole drilling and surface blasting, as applied in large surface mines, are comprehensively covered. Both new and classic concepts, techniques and methodologies are presented, supported by numerous illustrations and practical data. In 26 chapters, drilling,...

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Evaluation and Analysis of Blasting Procedures for Removing Hard ...

ABSTRACT: Drilling and blasting procedures are utilized for removing various types of hard overburden formations at the South Field Lignite Mine, ... four operational surface mines at the Lignite Center of Ptolemais-Amydeon, covering an .... corresponding trend lines, both explosives con- sumption and drilling is steadily...

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Blasting damage in rock - Rocscience

and surface mining has followed a rather erratic path. Only the most naively optimistic ... By far the most common technique of rock excavation is that of drilling and blasting. From the earliest days of .... These blasting methods, which involve the simultaneous detonation of a row of closely spaced, lightly charged holes,.

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blast pattern – Mining and Blasting

Oct 12, 2012 ... Posts about blast pattern written by PARTHA DAS SHARMA. ... Blast Design: This is meant to be a toolbox for blast design in conventional rock quarrying and open pit mines. .... Drilling (staggered) equilateral triangular pattern require more operator skill and supervision as compared to in-line patterns.

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Glossary of Mining Terms - SEC.gov

Bit - The cutting end of a drill frequently made of an extremely hard material such as industrial diamonds or tungsten carbide. Blackjack - A miner's term for sphalerite (zinc ... Broken reserves - The ore in a mine which has been broken by blasting but which has not yet been transported to surface. Brunton compass - A pocket...

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h_blasting in surface excavation - Mining and Blasting

The stemming material could be water, drill cutting, sand, mud or crushed rock. The best is the dry angular crushed rock. (<30mm) as it tends to form a compaction arch, which locks into the blasthole wall, increasing its resistance to ejection. Page 5. 5. The optimum stemming length can be found from the following formula:.

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drilling and blasting in hard rock narrow tabular mines - MOSH

CHAMBER OF MINES | DRILLING AND BLASTING IN HARD ROCK NARROW TABULAR MINES ... Relief holes or free breaking surfaces are critical. ... drilling, charging and blasting can compromise the face shape.” IMAGE. Drilling at right angles to a well-marked face, with top and bottom contact lines and drilling direction.

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Coal mining - Choosing a mining method | Britannica.com

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...

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Coal: Construction and Mining Impacts

Typical activities during the construction and mining phase include ground clearing (removal of vegetative cover and topsoil), drilling, blasting, trenching, excavation, .... For open pit mines, land use impacts could be significant in that the landscape would be much more difficult, and in some cases impossible, to reclaim to...

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Utilization of blast movement measurements in grade ... - CiteSeerX

For open pit mining operations in which ore and waste materials are ... minimizing the cost of the drilling and blasting operation. ... produce modified dig lines ore polygons reflecting distortion and movement resulting from the blast. The method as implemented uses common mine planning routines and is performed using.

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Drilling methods

Straight-hole drilling is of paramount importance while doing bench blasting, demolition work and tunnelling. – Tools for straight-hole drilling: •. Right drill rig. .... Drilling methods, rotary. Rotary drilling is used for big scale surface mining operations. Rotation and pull-down force are used to drive the drilling tools into the rock.

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Chapter 9 GENERAL ROCK REMOVAL - National Park Service

BENCH BLASTING. The most common method of production blasting in quarrying, strip mining, and construction excavation ... The drill patterns used in trenching range from the simple single row of holes to more complex triple-row. “Flat-V” or ... This is extremely difficult to do with single-row patterns; either most of the rock,.

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Optimization Of Blasting Design Parameters On Open Pit Bench A ...

Abstract: In hard rock mining, blasting is the most productive excavation technique applied to fragment insitu rock to the required size for efficient loading and crushing. ... In open pit mining where rock is hard such that ,it requires drilling and blasting .... Line drilling and blasting involves the drilling of closely spaced holes...

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MSHA - Coal Mine Fatal Accident Investigation Report: Fatality #9 ...

Jul 16, 2007 ... Surface Coal Mine Fatal Surface Blasting Accident July 16, 2007. CAM Mining, LLC Three Mile Mine #1. Ashcamp, Pike County, Kentucky I.D. No. 15-17659 .... Back break is typically noticed by the driller during drilling as a loss of air pressure, jumping of the drill stem, and otherwise difficult drill penetration.

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Development and Application of Blast Casting Technique in Large ...

Dec 20, 2015 ... All over the world, this method has successfully been applied to horizontal and dipping coal seams to offset the mining cost of conventional drilling and blasting methods where the increasing stripping ratios have become uneconomical [2–4]. This technique was applied in surface coal mines and other...

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Sr. Drill & Blast Engineer – DataCloud

The ideal candidate will have deep experience of drill and blast operations and modelling in an open pit mining environment. Strong knowledge of the theoretical and practical aspects of blasting are important. Experience in hard rock, open pit drill and blast operations with a solid understanding of the physics of blasting...

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Common Core Training - NORXinhai

Courses include Basic Underground Hard Rock Miner, Basic Underground Hard Rock Miner Service Type, Surface Miner, First Line Underground Mine Supervisors ... U0003 – Set up Wooden Staging U0004 – Drill Rock U0005 – Rock Bolt Ground U0006 – Blast Rock U0010 – Muck with Load Haul Dump (LHD) Machine

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