Green and Smart Mining Engineering
— This article summarizes the latest research progress in intelligent technology for underground mining of hard rock mines from six processes: rock drilling, blasting, …
Hard Rock Miner's Handbook
— Drill and blast system is used in hard rock excavation due to its economics and adaptability to changing rock mass conditions. Common question during mining and …
A new protective destressing technique in underground hard coal mining
— Destress drilling and blasting methods rely on the fact that fractured rockmass cannot withstand as much stress as a competent rock. This phenomenon was investigated by simulating 'Uniaxial Compressive Strength' tests on a coal sample. ... Deep underground hard rock mining has been experiencing the violent failure of rockburst for a while ...
Challenges and opportunities of using tunnel boring machines in mining
— Although TBMs in favourable ground conditions offer unparalleled advantages over drill and blast (D&B) in terms of higher advance rates, lower risk levels and possible cost reduction, they could experience great setbacks in adverse ground conditions, which results in significant losses in safety, cost and schedule (Barla and Pelizza, …
Hardrock Drilling | Expert Drilling Solutions for Any Challenge
With precise drilling techniques, we guarantee proper installation and long-term reliability for your renewable energy project. Trust our expertise for secure installations. ... Whether it's for construction or mining, we ensure accuracy and safety in every blast hole we drill. Maximize your project's productivity with our efficient drilling ...
Blast Hole Drilling
The bulk of blasting in mines involves charging explosives into holes drilled in rock. The mouth of the drill hole is called the collar and the end is the toe. Drilling is carried out by hand, hammer and chisel which tend to be …
Understanding the connection between blasting and highwall stability …
— 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 [3]. Additionally, smooth wall blasting is known to have performance issues in weak rock formations [3]. If the rock mass is too weak to …
(PDF) Drilling technology in mining industry
— The hard rock mining industry has long envied its counterparts in underground mining of evaporites, coal and soft iron ore, who have made great strides in productivity …
Perimeter Control in Development Mining
The principle objective of development mining is to create thoroughfares that can be accessed by personnel and machinery for the entire life of an underground mine. The drill and blast process, being the primary method used when creating these thoroughfares, needs to be able to adequately fracture the rock to be removed whilst at the same time …
(PDF) A review of rock cutting for underground mining: Past, present
November 2016; Journal of the Southern African Institute of Mining and Metallurgy 116(11):1011-1026
Mastering the Hard Rock: Effective Drilling Techniques and …
— Consider using advanced drilling techniques like DTH hammer drilling or rotary-percussive methods, which may offer better performance in specific types of hard …
How to Drill and Blast Different Rock Types Effectively
Learn the most effective drilling and blasting techniques for soft, hard and intermediate rocks in mining engineering, based on their characteristics, challenges and best practices.
Green and Smart Mining Engineering
— In underground mining of hard rock mines, the production processes mainly include drilling, charging, blasting, ventilation, transportation, hoisting, support and filling, as shown in Fig. 1 [1]pared with soft rock mines, achieving automation and continuity in hard rock mines is more difficult.
The Shape of Hard Rock Mining in the 21st Century
— Hard rock underground mining has been wedded to the drill-blast method of breaking rock. Current practice and technology have focused on greater efficiencies in the blasting and handling of ore, on the basis that the lower costs that come with larger scale operations compensate for the waste dilution associated with the bulk methods.
Causes, impact and control of overbreak in underground excavations
— Drill and blast system is used in hard rock excavation due to its economics and adaptability to changing rock mass conditions. Common question during mining and tunneling operations is 'whether ...
Ground behaviour analysis, support system design and …
— Stabilisation of the ground in underground works can be accomplished by natural or artificial ground support methods. Natural ground support approaches like …
perimeter drilling techniques in hard rock mining
Practice in hard rock mines is continually changing due … if perimeter drilling is to … ore bodies in hard rock mines stoped with bulk mining methods. » More detailed! Define Hard Rock Mining | eHow. In hard-rock mining, workers advance the tunnel by drilling and blasting the working face. … Many hard-rock mining methods are used to ...
Tunneling in Rock by Drilling and Blasting
— Tunnelling in Rock by Drilling and Blasting presents the latest developments in the excavation of tunnels using the drilling and blasting method. Examples of work conducted throughout the world including the Indian sub-continent, Australia, and Sweden amongst others are discussed. These tunnel projects serve to illustrate the challenges and i
Drilling and blasting designs for parallel hole cut and V-cut …
— Explosives are probably the most cost-effective method of rock excavation in underground mining operations 1,2,3.Tunnel and underground rock excavation have largely relied on drilling and blasting ...
Perimeter Control in Development Mining
This paper will discuss the benefits of using perimeter control blasting in a development mining operation and the theories that govern how these blasting techniques work. The …
Open-Pit Mining | Method and Process | Epiroc US
— The list of commodities is extensive, although the relative proportions mined underground and on the surface vary from mineral to mineral. Massive tonnages of hard coal and lignite are also produced from surface mines, although the terminology used – open cast or open cut, rather than open-pit – indicates that the technology and …
Engineering Geology Field Manual
vibration indicate a hard rock that will be difficult to break. Fast penetration and a quiet drill indicate a softer, ... tion and the stability of the perimeter of the excavation. Close jointing usually results in good fragmentation. ... Figure 19-4.—Two methods of breaking a hard collar zone. A pronounced foliation, bedding plane, or joint ...
Blasting Techniques & Safety Measures
— Drilling is carried out by hand, hammer and chisel which tend to be tedious and slow processes in hard-rock mining. The limitations to hand-drilled holes does not exceed 400 mm in length.
Causes and Consequences of Inefficient Drilling and Blasting …
— The causes of this problem include ineffective drilling practices and uneven and excessive charging of explosives, resulting in a slightly high powder factor of 3.94 kg/m 3 instead of 3.8 kg/m 3, as per the design. ... Perimeter blasting techniques, Smooth wall blasting, Drill and blast design ... A Case Study of Hard Rock Gold Mining ...
Lithium Extraction Methods
No drilling permits needed: Project implementation time: 12-15 months: 5-7 years: No asset acquisition: System design: Modular and mobile: Mobile / stationary: ... While traditional methods like hard rock mining and solar evaporation have significant environmental drawbacks, Direct Lithium Extraction (DLE) offers a promising solution. ...
Perimeter powder factor vs. percentage overbreak.
A methodology for determining overbreaks in hard rock tunnel construction using the drill-and-blast technique is presented in this paper.
Hard Rock Miner's Handbook
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
Blasting Techniques Used in Underground and Opencast Mines | Mining
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: (1) Pyramid cut or cone cut (2) Wedge cut (3) Drage …
(PDF) ROCK BLASTING FOR MINING
— Large scale mining in hard rock zones are difficu lt without the application of drilling and bl asting . ... ring drilling and blasting methods.. ... (contour or perimeter blasting) ...
Hard Rock Fragmentation in Percussion Drilling Considering …
— Percussion drilling is still widely recognized as the most effective drilling method in hard formations. 6, 7 In this method, the stress waves induced by the hammer force the drill bit to penetrate the rock, and the material is removed through the crushing of the rock immediately beneath the buttons and by coalescence of the lateral cracks ...
AN INTRODUCTION TO GEOLOGY AND HARD ROCK …
This paper is an introduction to selected topics in geology and hard rock mining. It is an overview and is intended to help the legal professional to learn basic information …