secondary blasting techniques

secondary blasting techniques

Controlled Blasting and Secondary Blasting Techniques

14.07.2020· Controlled Blasting and Secondary Blasting Techniques. LoadingAutoplay When autoplay is enabled, a suggested video will automatically play next. Up next

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Secondary Blasting Metallurgist & Mineral Processing

Secondary blasting requirements have varied from one shot per 27 tonnes (30 tons) to one shot per 900 tonnes (1,000 tons) of ore. Geology, structure, cave abutment loads, and location of the ore in the column all affect the amount of oversize boulders (greater than three-fourths cubic meter or one cubic yard) that require secondary breakage.

training.gov.au RIIBLA305D Conduct secondary blasting

2.2 Use appropriate explosives and/or techniques to achieve blast objective. 2.3 Activate warnings and notify relevant personnel of intended blasting. 2.4 Hook up and initiate blast. 3. Complete blasting operations . 3.1 Carry out post blast coordination and declare area safe for re-entry. 3.2 Inspect site and deal with non-conforming conditions . 3.3 Inspect equipment for defects and conduct

Definition of secondary blasting mindat

Two methods of secondary blasting of rock are available. The first, called the plaster or mudcap method, is to fire a charge of explosive placed on the rock and covered with clay, the shock of the detonating explosive breaking the block.

secondary blasting of rocks bloggercucina.it

Comparative analysis of hydraulic drop ball and secondary blasting technique for secondary breaking in aggregate quarries. secondary blasting webref . Irrespective of the method of primary blasting employed, it may be necessary to reblast a proportion of the rock on the quarry floor so as to reduce it to a size suitable for handling by the excavators and crushers available. Two methods

Blasting Techniques Curriculum : Fleming College

The course includes skills in survey methods for rock face conditions, layout patterns, and identifying three types of blasting cuts, and demonstrating the blasting techniques used in construction and at quarries. Upon completion of the course the students will have met the requirements for certification for the International Society of Explosives Engineers Level II.

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Chapter 11 SPECIALIZED BLASTING TECHNIQUES

BLASTING TECHNIQUES. 168 There are several types of explosives that can develop the appropriate detonation pressure. By knowing the detonation velocity and the density of a given explosive, the detonation pressure can be calculated (Chapter 2 Explosives). INITIATING DEVICES Avalanche blasting is based on a nonelectric detonating system or systems that are not susceptible to initiation

Blasting Techniques : Fleming College

Program Highlights

Blasting Techniques Used in Underground and Opencast

Blasting Techniques Adopted in Opencast Mines: Efficient blasting should give such rock fragmentation as to eliminate the need for secondary blasting. The fragmented rock should be easily handled by the bucket of the shovel. For mineral which has to go to crushers, the size should not be more than the input size for primary crusher.

secondary blasting of rocks bloggercucina.it

Comparative analysis of hydraulic drop ball and secondary blasting technique for secondary breaking in aggregate quarries. secondary blasting webref . Irrespective of the method of primary blasting employed, it may be necessary to reblast a proportion of the rock on the quarry floor so as to reduce it to a size suitable for handling by the excavators and crushers available. Two methods

Secondary blasting | Article about secondary blasting by

Comparative analysis of hydraulic drop ball and secondary blasting technique for secondary breaking in aggregate quarries. A case study of associated granite industry, Igboora, Oyo State, Nigeria. The labour cost for secondary blasting can be expressed as a percentage of the labour cost for primary mucking. Explosives and drilling . of Kirkland Lake has developed a pre-assembled secondary

Blasting Techniques Curriculum : Fleming College

The course includes skills in survey methods for rock face conditions, layout patterns, and identifying three types of blasting cuts, and demonstrating the blasting techniques used in construction and at quarries. Upon completion of the course the students will have met the requirements for certification for the International Society of Explosives Engineers Level II.

电话: (705) 749-5514

Comparative analysis of hydraulic drop ball and secondary

01.11.2008· Secondary blasting, thus, liberated significant amount of dust to the environment. Ground Vibration In hydraulic drop ball techniques ground vibration is either minimal or negligible. In the case of secondary blasting technique, the effect is much more pronounced as it affects the civil construction works around the blast area

Blasting Techniques Used in Underground and Opencast

Blasting Techniques Adopted in Opencast Mines: Efficient blasting should give such rock fragmentation as to eliminate the need for secondary blasting. The fragmented rock should be easily handled by the bucket of the shovel. For mineral which has to go to crushers, the size should not be more than the input size for primary crusher.

US5233926A Adhesive secondary blasting cone

A shaped secondary blasting charge including a frustoconical container and a viscous adhesive explosive overpacked into the container. A concave cover accommodates the overloaded explosive which is removed at the blasting site. The container with the explosive is pressed against the object to be blasted causing the viscous explosive to intimately bond to the surface.

RIIBLA305A Conduct secondary blasting

techniques to achieve blast objective 2.3. Activate warnings and notify relevant personnel of intended blasting in accordance with site procedures 2.4. Hook up and initiate blast 3. Complete blasting operations 3.1. Carry out post blast coordination and declare area safe for re-entry 3.2. Inspect site and deal with non-conforming conditions 3.3. Inspect equipment for defects and conduct

Blast Hole Drilling: The Basic Process | RPM Drilling

Technique #4 – Secondary blasting. Sometimes, no matter which method was initially employed, it may prove necessary to blast the same rock/location a second time in order to reduce the previously blasted portion of rock to a manageable size that can be easily handled by excavators, and/or crushers and other such machinery. There are two available methods of secondary blasting. The first is

Stope sequencing QueensMineDesignWiki

This disadvantage can be mitigated by technical blasting, being careful not to undercut pillars, and also by mass blasting high stress areas within the block in question. Furthermore, multiple lifts within the primary and secondary stopes also helps to reduce stress by allowing minor deformation to occur between stages/lifts and hence lowering the accumulated stress [2] .

H BLASTING IN SURFACE EXCAVATION

Secondary blasting can be done by pop shooting (blockholing) and plaster shooting (mudcapping). Shaped charges are sometime used in secondary blasting, but this is much more expensive. Cast Blasting When overburden is removed from a coal or mineral deposit it is generally cast to a waste dump by draglines, or removed by loaders and trucks. Cast blasting is the controlled placement of

Blasting Technique WOMP

The second major disadvantage of the V-cut is that large boulders can be produced from the center of the shot. These boulders are then either put aside and never processed (creating a hidden cost of lost material) or secondary blasting methods are used to break them (increasing cost). However, these can be eliminated by the use of baby Vs or

(PDF) Blasting and Mining

Controlled blasting techniques are therefore carried out so as to save cost and also enhance mine safety . • In a pre-split blast, series of parallel small-diameter boreholes

Rock blasting for mining LinkedIn SlideShare

28.07.2017· Controlled blasting is a technique of blasting for the purpose to reduce the amount of over break and to control the ground vibrations. 78. 90 5.3 Secondary Blasting: Irrespective of the method of primary blasting employed, it may be necessary to reblast a proportion of the rock on the quarry floor so as to reduce it to a size suitable for handling by the excavators and crushers. 91. 91 5

Techniques of Controlled Blasting by Partha D Sharma

Techniques of Controlled Blasting extent of disturbed zone may vary from as little as 0.1 – 0.2 m with excellent perimeter or contour blasting to

Optimization of Blasting Parameters in opencast Mines

techniques”, 19 th World Mining Congress,New Delhi, November, pp.583-595. Pal Roy, P. (2005), “Terms and parameters influencing mine and ground excavations”, Rock blasting effects and operations, pp. 17-22, ii . LIST OF FIGURES Figure No. Title of the figure Page No 3.1 : Drag Bit 13 3.2 : Tri-cone rock roller Bit 14 3.3 : Button Bit 15 3.4 : Pneumatically operated wagon Drill 17 3.5

7 Methods for Finishing a Metal Surface | Star

In some cases these scratches can be ignored but usually to make a truly “finished” part one or more secondary processes need to be applied. Below are brief descriptions of the 7 main finishing processes to remove these scratches to make your final piece look perfect. 1. Sanding. Sanding is simply a method for rubbing abrasive particles against the surface of a workpiece to create a random

Stope sequencing QueensMineDesignWiki

This disadvantage can be mitigated by technical blasting, being careful not to undercut pillars, and also by mass blasting high stress areas within the block in question. Furthermore, multiple lifts within the primary and secondary stopes also helps to reduce stress by allowing minor deformation to occur between stages/lifts and hence lowering the accumulated stress [2] .

Chapter 9 GENERAL ROCK REMOVAL National Park Service

SECONDARY BLASTING Bench blasting ideally reduces all rock to a desired rubble size range. This is basic in order to facilitate handling of rubble or muck to meet limitations imposed by equipment, such as bucket size, or to produce a usable material. Actually, even a satisfactory blast may leave a few oversized blocks that must be broken by blasting with a light charge placed in small drill

H BLASTING IN SURFACE EXCAVATION

Secondary blasting can be done by pop shooting (blockholing) and plaster shooting (mudcapping). Shaped charges are sometime used in secondary blasting, but this is much more expensive. Cast Blasting When overburden is removed from a coal or mineral deposit it is generally cast to a waste dump by draglines, or removed by loaders and trucks. Cast blasting is the controlled placement of

Underground mining (hard rock) Wikipedia

Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals, usually those containing metals such as ore containing gold, silver, iron, copper, zinc, nickel, tin and lead, but also involves using the same techniques for excavating ores of gems such as diamonds or rubies. Soft rock mining refers to excavation of softer minerals such as salt, coal

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