Drilling and Blasting Technical Aspects of Mining

Drilling. Most blasting in mines involves charging explosives into holes drilled in rock. The entrance or mouth of a drill hole is called the collar and the end is the toe. Drilling is still carried out in some cases, in the ASM sector, by hand, using a hammer and chisel. This is obviously tedious and slow, especially in hard-rock mining

Drilling and blasting iron ore mine YouTube

Dec 10, 2016 Now chatting: leawaysschool/solution.htmlContact Us: leawaysschooldrilling and blasting for iron oreShift Foreman: Blasting

HOME QUALITY DRILLING AND BLASTING OREGON SO

Quality Drilling and Blasting has over 28 years experience in blasting, drilling and rock trenching in the unique conditions of Oregon and So Washington.

BEST PRACTICES IN DRILL AND BLAST

and blasting. In drilling, there is now available advanced use of GPS guided drilling systems that continue to grow and improve precision and effi ciency. Drill depths are accounted for more accurately, making it easier to assign the right amount of explosives in blasting. New GPS-enabled applications have improved strata recognition

Underground mining (hard rock) Wikipedia

Aug 28, 2002 Only enough ore is removed from the stope to allow for drilling and blasting the next slice. The stope is emptied when all of the ore has been blasted. Although it is very selective and allows for low dilution, since most of the ore stays in the stope until mining is completed, there is a delayed return on capital investments.

Controlling fragmentation Orica Mining Services

ore on electricity; an equivalent amount on grinding media in the SAG circuit alone; but only $0.30/t of broken ore on explosives at the drill and blast stage. Yet, the blasting process is a much more energy efficient method of fragmenting rock. The need for energy efficient processing is becoming increasingly important as we continue

Chapter 8 BLAST DESIGN

situations may also require the adoption of a higher velocity, more energetic explosive. Where drilling and blasting conditions are both severe, the operator should use premium explosives, at least in the bottom one third of the drill hole. Clearing the toe, and therefore contributing to a smoother floor, is a major asset to improve BLAST DESIGN

H BLASTING IN SURFACE EXCAVATION

Blasthole diameter (D): Generally, the cost of drilling and blasting decreases as hole diameter increases. The relation between blasthole diameter and face height is approximately: D = 0.001 to 0.02 H Since iron ore is hard rock, and referring to Table 1 the rock factor A can be taken as 11. Assuming flyrock has to be controlled, Z=1.25.

(PDF) Blast design for underground long hole stope to

Longhole stoping with ring drilling is best suited method for large scale production from exploitation of nearly vertical ore deposit. However production blasting in underground stope beneath

Drilling and blasting iron ore mine YouTube

Dec 10, 2016 Now chatting: leawaysschool/solution.htmlContact Us: leawaysschooldrilling and blasting for iron oreShift Foreman: Blasting

HOME QUALITY DRILLING AND BLASTING OREGON SO

Quality Drilling and Blasting has over 28 years experience in blasting, drilling and rock trenching in the unique conditions of Oregon and So Washington.

How Can Drill & Blast Operations Make Mining More

May 06, 2020 Obviously drill and blast significantly impacts how process ore and gangue is transported and separated. The Move To Smarter Mining. Taking advantage of the latest technologies and smart drilling and blasting approaches can offer planners and leaders a critical lever to smarter mining and procession, considerably lifting productivity as well as

8.3.3: Sublevel (Open) Stoping ABC 123: Testing Site

Aug 03, 2010 There are different variations, but essentially, we delineate stopes, and then through drilling and blasting, we slice off segments of the ore, and remove the blasted ore through draw points. We often divide the stope vertically by driving sublevels longitudinally, and then we ring drill with the sublevel, charge the holes, and initiate the blast.

(PDF) 3-D Visual Drill and Blast Design

Drilling and blasting are the two key components in the overall rock fragmentation system, the first element of the ore extraction process.

Aggregate Resource Industries Drilling and Blasting

Apr 26, 2017 Drilling & Blasting. Aggregate Resource Industries is a rock drilling and blasting contractor that provides rock drilling & blasting services throughout Oregon, Washington, Idaho, Nevada, Montana, California, Colorado, Wyoming, North Dakota, Texas and Alaska.

Blast Optimization and Ore Fragmentation Modeling

Sep 19, 2018 To find the optimal fragmentation, one must compare the total cost for drilling, blasting, mucking, haulage, boulder elimination, capital and development-cost and ore benefication cost for each size-distribution. The size-distribution that yields the lowest total cost per ton of ore mined, represents the optimal size-distribution.

Underground mining (hard rock) Wikipedia

Only enough ore is removed from the stope to allow for drilling and blasting the next slice. The stope is emptied when all of the ore has been blasted. Although it is very selective and allows for low dilution, since most of the ore stays in the stope until mining is completed, there is

(PDF) Blast design for underground long hole stope to

Longhole stoping with ring drilling is best suited method for large scale production from exploitation of nearly vertical ore deposit. However production blasting in underground stope beneath

H BLASTING IN SURFACE EXCAVATION

Blasthole diameter (D): Generally, the cost of drilling and blasting decreases as hole diameter increases. The relation between blasthole diameter and face height is approximately: D = 0.001 to 0.02 H Since iron ore is hard rock, and referring to Table 1 the rock factor A can be taken as 11. Assuming flyrock has to be controlled, Z=1.25.

Engineering Geology Field Manual Volume II 2nd Ed

An observant blasting driller can be of great help in assessing rock variations that are not apparent from the surface. Slow penetration, excessive drill noise, and vibration indicate a hard rock that will be difficult to break. Fast penetration and a quiet drill indicate a softer, more easily broken zone of

Mining of Iron Ores IspatGuru

Mar 14, 2014 The wide holes in the ground created by drilling, blasting and ore removal are referred as ‘open pits’. Crushing and washing of ores. In crushing and washing plants the processing of the ore is carried out. Processing of the ore ranges from simple crushing and screening and separating various size fractions of the ore to the processes that

Mines ::MGM Minerals Limited

The ore is being loosened by deep hole drilling & blasting. The loose ore is then excavated and picked up to 450 mm size which is further fed to crushing and screening unit for processing to obtain desired size and grade. Our mining division is accredited with international quality standards such as ISO 9001, ISO 14001, OHSAS 18001

Optimization of Blasting Parameters in opencast Mines

designed blasting pattern has to be achieved. Proper adoption of drilling and blasting can contribute significantly towards profitability and therefore optimization of these parameters is essential. Introduction Rock breaking by drilling and blasting is the first phase of the production cycle in

How Can Drill & Blast Operations Make Mining More

May 06, 2020 Obviously drill and blast significantly impacts how process ore and gangue is transported and separated. The Move To Smarter Mining. Taking advantage of the latest technologies and smart drilling and blasting approaches can offer planners and leaders a critical lever to smarter mining and procession, considerably lifting productivity as well as

(PDF) Reducing Drill and Blast Cost through Blast

The blast performance in terms of When drilling and blasting the ore zones in Block the BCM blasted per hole would increase from 72 C pit, Proposal 2 gives better alternative set of drill to 108 m3, an increment of 50%. The total cost per and blast parameters with the minimum total cost BCM blasted when Proposal 2 is adopted as a per BCM of ore

8.3.3: Sublevel (Open) Stoping ABC 123: Testing Site

Aug 03, 2010 There are different variations, but essentially, we delineate stopes, and then through drilling and blasting, we slice off segments of the ore, and remove the blasted ore through draw points. We often divide the stope vertically by driving sublevels longitudinally, and then we ring drill with the sublevel, charge the holes, and initiate the blast.

Blast Optimization and Ore Fragmentation Modeling

Sep 19, 2018 To find the optimal fragmentation, one must compare the total cost for drilling, blasting, mucking, haulage, boulder elimination, capital and development-cost and ore benefication cost for each size-distribution. The size-distribution that yields the lowest total cost per ton of ore mined, represents the optimal size-distribution.

Underground mining (hard rock) Wikipedia

Only enough ore is removed from the stope to allow for drilling and blasting the next slice. The stope is emptied when all of the ore has been blasted. Although it is very selective and allows for low dilution, since most of the ore stays in the stope until mining is completed, there is

Aggregate Resource Industries Drilling and Blasting

Apr 26, 2017 Drilling & Blasting. Aggregate Resource Industries is a rock drilling and blasting contractor that provides rock drilling & blasting services throughout Oregon, Washington, Idaho, Nevada, Montana, California, Colorado, Wyoming, North Dakota, Texas and Alaska.

Engineering Geology Field Manual Volume II 2nd Ed

An observant blasting driller can be of great help in assessing rock variations that are not apparent from the surface. Slow penetration, excessive drill noise, and vibration indicate a hard rock that will be difficult to break. Fast penetration and a quiet drill indicate a softer, more easily broken zone of

Mining of Iron Ores IspatGuru

Mar 14, 2014 The wide holes in the ground created by drilling, blasting and ore removal are referred as ‘open pits’. Crushing and washing of ores. In crushing and washing plants the processing of the ore is carried out. Processing of the ore ranges from simple crushing and screening and separating various size fractions of the ore to the processes that

H BLASTING IN SURFACE EXCAVATION

Blasthole diameter (D): Generally, the cost of drilling and blasting decreases as hole diameter increases. The relation between blasthole diameter and face height is approximately: D = 0.001 to 0.02 H Since iron ore is hard rock, and referring to Table 1 the rock factor A can be taken as 11. Assuming flyrock has to be controlled, Z=1.25.

Mines ::MGM Minerals Limited

The ore is being loosened by deep hole drilling & blasting. The loose ore is then excavated and picked up to 450 mm size which is further fed to crushing and screening unit for processing to obtain desired size and grade. Our mining division is accredited with international quality standards such as ISO 9001, ISO 14001, OHSAS 18001

BLAST FRAGMENTATION OPTIMIZATION AT TARKWA GOLD

The focus has been on both drilling and blasting parameters as both processes had to be taken into account. These parameters are technical but personnel factors were also identified and dealt with as they arose. In order to measure the impact of any change in the process parameters on the fragmentation size distribution, cameras have been acquired.

Design methodology for underground ring blasting

blasting refers to long hole blasting techniques as (e.g. drill position), although a ring may also refer to a and ef cient ore pass performance. In the case of block caving undercut and drawbell design, the design objectives may re ect speci c requirements which may

Drilling and Blasting an overview ScienceDirect Topics

Jan 01, 2012 Zong-Xian Zhang, in Rock Fracture and Blasting, 2016. 21.5.2 To Increase Explosive Energy in Blasting. The preceding analysis indicates that an increase in drilling and blasting energy can increase the efficiency of total energy in the whole size reduction system. Moreover, a total of 210 blast tests show that the specific surface created by blasting in the unit of cm 2 /g linearly increases

Open-pit Mining Mining North Works

Occasionally, drilling and blasting ore is not required and can simply be removed by what is known as free digging. As the open pit gets deeper the work area gets smaller and smaller limiting equipment access. To receive information on mining in the North subscribe to the NWT & Nunavut Chamber of Mines newsletter.