opencast blast hole sizes

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blasting holes in mining - essentialgapcoza

H BLASTING IN SURFACE EXCAVATION - Mining and Blasting 2 Blasthole diameter (D): Generally, the cost of drilling and blasting decreases as hole diameter increas The relation between blasthole diameter and face height ....

Case Study Cast Blasting - Orica Mining Services

Larger diameter (229mm) is better suited for cast blasting for improved cast and cost Cost analysis showed that designs with larger diameter blast holes lead to reduced mining cost and faster coal uncovery rate The overall result of the first cast shot was excellent and Peabody Wilkie Creek Mine is continuing to see benefits of this project...

The basic patterns of drill holes employed in opencast ,

• The basic patterns of drill holes employed in opencast mines are • Square Pattern • Staggered (or) Triangular pattern • Single row blasting pattern • Multi blasting pattern • Wedge cut pattern • Diagonal blasting pattern • Square Pattern: • This pattern can also be called as multi row pattern...

Rock fragmentation control in opencast blasting

fragmentation control in opencast blasting, Journal of Rock Mechanics and Geotechnical Engineering (2016), doi: 101016/jjrmge201510005 This is a PDF file of an unedited manuscript that has ....

Blast design in opencast mining - SlideShare

Blasting There are two types of variables in blasting design 1 Uncontrollable variables- geology, rock characteristics and local specifications 2 Controllable variables- Burden and spacing, Hole diameter, hole depth, Number of holes in the blast, Sub- grade ,...

Optmization of blasting parameters in open cast mines

The parameters are i) Drill hole diameter ii) Power factor (desired) iii) Cost of explosive iv) Number of holes required to blast Drill hole diameter :- The drill hole diameter are taken as fixed parameter because the bit size available in the market is limited The hole diameter is also vary as the geology condition of the strata...

Assessment of the Effect of Blast Hole Diameter on the ,

The change in the number of oversize boulders in ANFO blasts was negligible because mean energy factor remained almost same even when the diameter of the blast holes was altered The decrease in the number of oversize boulders in SME blasts was on account of increase in mean energy factor when the blast hole diameter was increased...

Condition for deep hole blasting or opencast mines using ,

Mar 17, 2018· Condition for deep hole blasting or opencast mines using heavy earth moving machinary Part 1 Condition for deep hole blasting or opencast mines using heavy earth moving machinary Part 1...

Choice Of Explosive For Open Cast - Natkhat Science

Aug 19, 2018· In quarrying and opencast mining a whole range explosives types can find application because of the wide variety of conditions encountered The most suitable explosive or combination of explosives for a given set of conditions can only be determined after many factors have been considered, each pointing to a particular explosive requirement ....

Rock fragmentation control in opencast blasting | daryl ,

The blasting operation plays a pivotal role in the overall economics of opencast min The blasting subsystem affects all the other associated subsystems , ie loading, transport, crushing and milling operations Fragmentation control through...

blast pattern – Mining and Blasting

Oct 12, 2012· Once the hole diameter has been established, burden distance can be selected , Confined holes in the blast give poor breakage with bench floor underbreaks as a result 2 Gas venting along schistosity in the walls Flyrock and blocks is normal, particularly in the first row Spacing must be reduced in the first row to reduce these problems...

The basic patterns of drill holes employed in opencast ,

• The basic patterns of drill holes employed in opencast mines are • Square Pattern • Staggered (or) Triangular pattern • Single row blasting pattern • Multi blasting pattern • Wedge cut pattern • Diagonal blasting pattern • Square Pattern: • This pattern can also be called as multi row pattern...

Enhancement of Drilling & Blasting efficiency in Opencast ,

underground and opencast mines / quarries, it has taken a major leap forward in enhancement of , Sometime, blast hole drill monitoring and navigation system that allows operators to get within , • 32-percent decrease in the mean size of rock in the post-blast muck pile 3 • ,...

Coal Mining – Makomo Resources

Coal Mining Makomo operates an opencast mine, and supplies coal by road to Hwange Power Station Our close proximity to the Entuba Siding enables full use of rail transportation into Munyati, Bulawayo and Harare Power Stations...

Drill and Blast Method - railsystem

Drill and Blast Method Drill and blast method is mostly used method for the excavation throughout the world The method can be used in all types of rocks and the initial cost is lower than the mechanical method like TBM This tunneling method involves the use of explosiv...

A New Perimeter Control Blast Design Concept for ,

A NEW PERIMETER CONTROL BLAST DESIGN CONCEPT FOR UNDERGROUND METAL/NONMETAL DRIFTING APPLICATIONS Stephen R Iverson, William A Hustrulid, and Jeffrey C Johnson DEPARTMENT OF HEALTH AND HUMAN SERVICES Centers for D isease Control and Prevention National Institute for Occupational Safety and Health...

Reduction of Blast Induced Ground Vibrations with Open ,

A computational model of dimensions 400 m x 40 m x 100 m size was created A free face was created with a bench height of 7 m A blast hole of 150 mm diameter was created at a distance of 4 m (burden) from the free face These parameters are of those full-scale single hole blast conducted at an opencast coal mine in India (Adhikari et al, 2005)...

Rock fragmentation control in opencast blasting

Opencast blast Rock fragmentation Explosives performance Dragline efficiency Fragment size abstract The blasting operation plays a pivotal role in the overall economics of opencast min The blasting sub-system affects all the other associated sub-systems, ie ,...

Blast Hole Drill Rig for Opencast Mines(id:9192195) Buy ,

Blast Hole Drill Rig for Opencast Mines(id:9192195) View product details of Blast Hole Drill Rig for Opencast Mines from Revathi Equipment Ltd manufacturer in EC21...

BLAST VIBRATION MONITORING IN OPENCAST MINES

design will help in bearing in mind the proper hole diameter and pattern that would reflect the efficient utilization and distribution of the explosives energy laden into the blast hole It would also provide for the appropriate amount of time between adjacent holes in a blast to provide the explosive the optimal level of energy confinement...

Opencast Mining (Quarrying): Methods, Advantages ,

Mechanical Opencast Working: In this method heavy earth moving machinery like draglines, power shovels, rear-dumping trucks (common type being Haulpaks), well-hole drills etc are used The blast holes are 6 m to 18 m deep, and 125 mm to 250 mm diameter The rock is blasted by liquid oxygen, open cast gelignite or other high explosiv...

Optimization_of_Blasting_Parameters_in_Opencast_Mines_06 ,

Button bitBlast hole sizes produced by rotary machines vary in the size range of 100 to 445mm diameter with the most common sizes being 200 This hammer contains a piston and valve arrangement Drag bit: they have three or four cutting wings tipped with carbide inserts and usually an A regular threaded pin connection...

Prediction of blast-induced flyrock in Indian limestone ,

Blast design data, such as burden, spacing, stemming, average depth of blast holes, blast hole diameter, charge per hole, linear charge concentration, specific charge (ie ratio of explosive consumed to tonnage of rock broken per blast, kg/t), maximum throw of flyrock or flyrock distance from the blasting face, are generated before blasting ....

The Use of Explosives in Surface Mining | SpringerLink

Abstract In the hard rock deposits in particular, changing from a somewhat haphazard system to a modern one is no trivial undertaking Ultimate conditions depend very largely on the results of primary blasting and if this is to be really efficient it must be properly designed from a ,...

Opencast Mining in India - impcenter

Opencast mining in India is practiced in manganese-ore mining in Madhya Pradesh and the overburden benches are 30 ft (9 meters) high Blast-hole drilling is employed and power shovels are used for loading into the dumpers or trucks Bulldozers do the leveling of the waste...

Surface drill rigs — Mining and Rock Technology

Our Surface down-the-hole (DTH) drills offer the highest mobility, a smaller footprint and the ability to serve multiple sit Equipped with powerful down-the-hole hammers, Down The Hole Rigs are designed for high-capacity rock drilling in quarries, opencast mines and rock excavation projects...

EXPLOSIVES AND BLASTING (OPENCAST) - mineportalin

Explosives & Blasting in Opencast By: Partha Das Sharma EMail: [email protected] Page 1 EXPLOSIVES AND BLASTING (OPENCAST) , The optimum blast hole diameter is governed by factors such as type of Explosives, Rock mass properties, degree of fragmentation desired and height of bench An optimum blast hole diameter is...

Opencast Mining in India - impcenter

Opencast mining in India is practiced in manganese-ore mining in Madhya Pradesh and the overburden benches are 30 ft (9 meters) high Blast-hole drilling is employed and power shovels are used for loading into the dumpers or trucks Bulldozers do the leveling of the waste...

Opencast Mining in India - ImportantIndia

Mar 19, 2014· Opencast mining in India is practiced in manganese-ore mining in Madhya Pradesh and the overburden benches are 30 ft (9 meters) high Blast-hole drilling is employed and power shovels are used for loading into the dumpers or trucks Bulldozers do the leveling of the waste...

Package Explosives & Accessories | Products | EXPLOBLAST

Allows the user to sequence blast in a very easy and efficient was, especially when blasting a large amount of blast hol EZ Det The EZ Det composed of a shock tube of different lengths with a detonator and a connector in the same unit It includes both the down-the –hole (DTH) detonator and a surface truck line delay (TLD) connector...