perimeter drilling techniques in hard rock mining
perimeter drilling techniques in hard rock mining
Zhengzhou, Henan China
24 hours At your service

perimeter drilling techniques in hard rock mining

  • Home
  • / Product
  • / perimeter drilling techniques in hard rock mining

A New Perimeter Control Blast Design Concept for ...

The damage results in overbreak or rock that was not designed to be removed, loose rock to be scaled, and permanent damage to the remaining perimeter. Both the lack of a controlled blast design and of precision drilling are the main causes of perimeter damage. Perimeter damage was assessed in 2006 and 2007 by researchers from the National

More

(7) Drilling for mining operations

hard and soft rocks at greater than 200m depth Reverse Circulation Minimal contamination. Small sample size Quick and cheap. Some core recovery Geochemical sampling into bedrock Air Core Won ’t penetrate hard rock. Sample contamination. Limited depth. No structural data Large sample volume. Quick and cheap. Rock chips Geochemical sampling to ...

More

Drilling and Coring Techniques for Hard Rock SpringerLink

Publisher Name Springer, Berlin, Heidelberg. Print ISBN 978-3-642-45618-3. Online ISBN 978-3-642-45616-9. eBook Packages Springer Book Archive. Buy this book on publisher's site. Reprints and Permissions. Personalised recommendations. Drilling and Coring Techniques for Hard Rock

More

Blast Hole Drilling: The Basic Process RPM Drilling

Aug 24, 2017  Blast hole Drilling is a technique used in mining whereby a hole is drilled into the surface of the rock, packed with explosive material, and detonated. The aim of this technique is to induce cracks in the inner geology of the surrounding rock, in order to facilitate further drilling and associated mining

More

Types of Drilling Methods used in Mining Boring Mining ...

In this article we will discuss about the types of drilling methods used in mining. The types are: 1. Percussive Drilling 2. Rotary Drilling. Method # 1. Percussive Drilling: In this method which is the oldest one of drilling, the hole is drilled by striking a number at short in intervals on the rock by a chisel-type tool and between the blows ...

More

Hard Rock Miner's Handbook - Stantec

Hard Rock Miner’s Handbook is a work of the heart. Jack—whose 40+ year career spanned engineering, construction, and operation of mining projects worldwide—conceived of and wrote the first edition of the Handbook, published in June 2000, to assist miners and engineers in the difficult world of hard rock mining. It was his

More

Underground (Hard Rock) Mining : OSH Answers

Jul 23, 2021  Anyone working underground to mine hard minerals such as ore containing gold, silver, iron, copper, zinc, nickel, tin, and lead may be exposed to many hazards. The same processes are used for mining hard gems like diamonds. Soft rock miners excavate softer minerals like salt or coal. There are many technical services jobs required underground ...

More

Underground hard-rock mining - 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.It also involves the same techniques used to excavate ores of gems, such as diamonds and rubies. Soft-rock mining refers to the excavation of softer minerals, such as salt ...

More

Rock blasting for mining - SlideShare

Jul 28, 2017  Let us see the details of blasting methods adopted in mining operations. 10. 10 This image shows a large scale open cast mine. Large scale mining in hard rock zones are difficult without the application of drilling and blasting operations. 11. 11 This is an areal view of a mine. 12. 12 This illustration shows the schematic view of a quarry ...

More

(7) Drilling for mining operations

hard and soft rocks at greater than 200m depth Reverse Circulation Minimal contamination. Small sample size Quick and cheap. Some core recovery Geochemical sampling into bedrock Air Core Won ’t penetrate hard rock. Sample contamination. Limited depth. No structural data Large sample volume. Quick and cheap. Rock chips Geochemical sampling to ...

More

Hard Rock Miner's Handbook - Stantec

Hard Rock Miner’s Handbook is a work of the heart. Jack—whose 40+ year career spanned engineering, construction, and operation of mining projects worldwide—conceived of and wrote the first edition of the Handbook, published in June 2000, to assist miners and engineers in the difficult world of hard rock mining. It was his

More

FINAL WALL STABILITY IN METAL OPEN PIT MINES USING ...

and damage to rock walls at the perimeter of blasting holes in pit stability, reducing these undesirable effects is crucial. Controlled blasting techniques are used to efficiently distribute explosive charges in a rock mass, thereby minimizing the fracturing of rock beyond the crestline of the highwall or designed boundary of main excavation areas.

More

Blasting Best Practices T.M.I. - T.M. International

Perimeter blasting uses minor drilled columns to make a parallel contour that has more dimension than line drilling, although the techniques are similar. Especially due to overhead material, perimeter blasting manages the depth of the blast. Secluding the damage to one section means less loose rock can threaten workers and supports aren't ...

More

3 Technologies in Exploration, Mining, and Processing ...

for drilling and blasting. In hard-rock mines carefully planned drilling into the ore and blasting with dynamite or ammonium-nitrate explosives are common. Underground metal-mining methods may be unsupported, supported, and caving methods, and there are numerous variations of each.

More

WALL CONTROL BLASTING AT THE ORPHAN BOY MINE –

flexible means of accessing the orebody in a hard rock mine (Sellers, 2011). In hard rock mining activities, blasting is conducted after drilling in the ground fragmentation process, and involves the detonation of explosives to break rocks into desirable sizes. Explosives (chemical substances) are placed in drill holes, and detonated to ...

More

Rock Engineering Practice Design

Drill Blast Drill Blast –– Fly RockFly Rock Fl k i t t t bl t d th i Fly rock is a constant concern to blasters and their co-workers. It can be controlled if proper preparation, blasting techniques and safety ppjrocedures are followed. Four of the major causes of excessive fly rock are: • Geology conditions.

More

Rockburst management in Canadian hard rock mines ...

Oct 01, 2019  1. Introduction. Rockburst, the sudden violent failure of rock, has been a significant hazard in hard rock mining for many decades. Andrieux et al. (2013) provided a series of rockburst case studies from several mining camps, highlighting the problem and documenting some of the risk mitigation strategies used. Despite of recent progresses, dynamic ground failure remains a major

More

Techniques of Controlled Blasting - SlideShare

Dec 17, 2009  4. Following are the techniques of controlled blasting: Line drilling, Trim (Cushion) blasting, Smooth (contour or perimeter) blasting, Pre-splitting, Selecting and employing various parameters of blast design, using modern technology, Precise and accurate timing delays, Muffle blasting at critical and congested areas. 4. 5.

More

WALL CONTROL BLASTING TECHNIQUES by Partha D Sharma -

Feb 25, 2011  Modified forms of line drilling may be used in mining and quarrying in special circumstances. ... In hard rock it has been found that the toe of

More

Perimeter blasting with the ANFO-spoon technique ...

Dec 31, 1994  @article{osti_433691, title = {Perimeter blasting with the ANFO-spoon technique}, author = {McDonald, K and Ng, L}, abstractNote = {The benefits of controlled blasting techniques have gained increasing recognition by the mining industry in recent years. The utilization of an effective controlled blasting program can result in a safe work environment with less loose rock and a reduced level of ...

More

Typical Blasting Methods for Structural Engineering Operations

The blasting method is used for rock excavation. Controlled blasting is a technique of blasting, which is used to reduce the amount of over break and to control ground vibrations. The different types of controlled blasting techniques are pre-splitting, smooth blasting, line drilling, perimeter blasting, and cushion blasting.

More

Understanding the connection between blasting and highwall ...

Jan 01, 2019  The smooth wall technique also involves more perimeter drill holes when compared to conventional underground methods. Drilling costs have the greatest impact on the economics of any blasting operation . Additionally, smooth wall blasting is known to have performance issues in weak rock formations . If the rock mass is too weak to support itself ...

More

Royex Rock Breaking Excavation – Safe, Reliable and Low ...

Reliable and effective solutions for complex rock breaking projects in civil engineering, tunneling and mining applications The Royex rock breaking system is a collection of products and techniques designed to effectively break rock without the impact of ground vibrations, fly rock

More

PERIMETER CONTROL AT ORAPA DIAMOND MINE Kedikilwe

The Southern African Institute of Mining and Metallurgy Surface Mining 2008 K Oageng, R O Joseph and I Munyadzwe _____ Page 138 1 INTRODUCTION Even though some specialized blasting techniques were used before at Orapa Mine to protect the pit perimeter, the mine continued to experience persistent over break during

More

AN INTRODUCTION TO GEOLOGY AND HARD ROCK MINING

The Rocky Mountain Mineral Law Foundation is grateful to Dr. Willard Lacy’s family for permission to publish this reformatted version of An Introduction to Geology and Hard Rock Mining.

More

Blast Hole Drilling: The Basic Process RPM Drilling

Aug 24, 2017  Blast hole Drilling is a technique used in mining whereby a hole is drilled into the surface of the rock, packed with explosive material, and detonated. The aim of this technique is to induce cracks in the inner geology of the surrounding rock, in order to facilitate further drilling and associated mining

More

FINAL WALL STABILITY IN METAL OPEN PIT MINES USING ...

and damage to rock walls at the perimeter of blasting holes in pit stability, reducing these undesirable effects is crucial. Controlled blasting techniques are used to efficiently distribute explosive charges in a rock mass, thereby minimizing the fracturing of rock beyond the crestline of the highwall or designed boundary of main excavation areas.

More

Code of Practice

Substantial and unwarranted damage to the rock at the perimeter of an excavation can result from the use of inappropriate drilling and blasting practices. Controlled drilling and blasting practices are designed to “cut” the rock rather than general demolition of the rock mass. Rock damage due to drilling and blasting can be minimised by:

More

Drilling Machines - EOLSS

for drilling small holes in hard rock, DTHs for large holes in hard rock, and rotary drilling for large holes in soft to medium hard rock. 1. Introduction 1.1. Principles of Rock Drilling The principal methods of rock drilling used in mines today are mechanical and driven by either impact or simple rotation.

More

mining engineering: Explosives and Drilling

Sep 20, 2010  Crater blasting techniques ([email protected], MVCR, HCR, and HRM) are often employed for larger underground ore bodies in hard rock mines stoped with bulk mining methods. (Refer to Chapter 3 – Mining Methods for additional information.) Crater blasting has been used successfully for drop raises and even for shaft sinking.

More

Microtunneling in Rock: Fact or Fiction?

mine hard abrasive rock remains more fiction than fact today. Their small size and small cutting tools simply cannot put enough pressure on hard rock to cut it efficiently, if at all. The small amount of metal on the cutting tools can also wear away quickly. This is especially true for the critical perimeter

More

Controlled BLASTING Drilling Mining

controlle. d blasting. abhijeet rout 170301190004 controlled blasting rock fragmentation by explosives is presently the most inexpensive process available to the hard rock mining industry. the challenge remains, however, to control the explosive energy to optimize fragmentation produced by blasting and minimize the deleterious effects associated with the use of explosives. these harmful ...

More

Royex Rock Breaking Excavation – Safe, Reliable and Low ...

Reliable and effective solutions for complex rock breaking projects in civil engineering, tunneling and mining applications The Royex rock breaking system is a collection of products and techniques designed to effectively break rock without the impact of ground vibrations, fly rock

More

The difference between 3 rock drilling methods — Rotary ...

Feb 27, 2019  Drilling and blasting is an important section during mining production. Let’s talk about the three methods of rock drilling — Rotary drilling, DTH (down the hole) drilling and Top hammer ...

More

Over break control in underground mines

Blasting is an integral part of hard rock mining and remains the most cost effective method of hard rock fragmentation. However, the costs associated with blast damage ... Drilling and blasting practice b. Explosive characteristics and distribution ... perimeter control techniques. If the

More

Controlled blasting for enhanced safety J in the ...

the blocks of rock formed by the intersection of the fractures and the slips on pre-existing jointing. Thus, the formation of adverse hangingwall conditions in any given mining scenario can be altered to some degree by the correct choice of explosive type, hole size and round design, but may require more significant changes in mining direction ...

More

TUNNELS, SHAFT AND DEVELOPMENT HEADINGS BLAST

Drilling in the crumbly clinker zones was extremely difficult. Holes were drilled relatively fast but cleaning them and keeping them open was hard to do. Drilling in the clinker areas was similar to drilling into a loosely cemented gravel pile. As soon as the drill steel was removed, rock chunks would fall in, block the hole, and subsequently

More