perimeter drilling techniques in hard rock mining

Measurement of blast damage - OSMRE

cance of the costs of blast-induced rock-mass damage in terms of mining ... measurement by simple, reliable and robust techniques. ... drilling control, the dislocation of rock due to venting of explosive ... Damage in underground mining has received com- paratively less .... part of the perimeter blast holes intact, referred to as.

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

Evolutionary and Revolutionary Technologies for Mining (2002) ..... In hard-rock mines carefully planned drilling into the ore and blasting with dynamite or .... design (e.g., computer-simulation-assisted design) would improve perimeter control, ...

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THE UNIVERSITY OF QUEENSLAND Bachelor of ... - UQ eSpace

Nov 1, 2016 ... pattern for effective energy distribution, perimeter holes spacing of 0.65m, ..... Drill and Blast Design in 2D Face (Onederra, Riihoja and Chitombo, 2001) . ..... Sub-level caving underground mining method is becoming more ...

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Controlled Blasting - 911 Metallurgist

Feb 14, 2018 ... Propagation of Vibrations; Controlled Blasting Techniques ... the most inexpensive process available to the hardrock mining industry. ... The five main controlled blasting or perimeter control techniques are line drilling, ...

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Wall Control Blasting Techniques | Explosive Material | Strength Of ...

Author: Partha Das Sharma, (B.Tech-Hons., Mining Engg.), E.mail: ... Smooth blasting, used underground, is similar to cushion blasting. ... Line drilling involves the drilling of closely spaced small diameter holes at the perimeter of the ...

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A REVIEW OF THE DESIGN CRITERIA AND PRACTICAL ... - SAIMM

In both surface and underground mining operations there is a need for the use of ... The perimeter blasting technique used depends on the rock type. .... protect the final perimeter, the blast holes adjacent to the line drill are spaced more ...

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Whistle Mine Waste Rock Study: Volume I - MEND | NEDEM

Oct 9, 2013 ... was to develop and illustrate technology for evaluating waste rock ... the pile was very difficult to drill and sample due to high porosity and ...... Rainfall which falls on the perimeter slopes facing away from the pit, and much of.

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R-04-62 - Svensk Kärnbränslehantering AB

Nord and Stig Brännström (Atlas Copco Rock Drill AB) has been involved in the ... of excavation method pending that Drill & Blast is executed to minimize the ... damaged zone and would not create connected flow paths along the perimeter of the ..... Compared to any underground facility for civil engineering or for mining ...

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Deep Underground Hard-Rock Mining - Bibliothèque et Archives ...

3.3 Technology and Underground Mining Sequences ...... extensively from developrnents in the areas O:' hard-rock drilling and blasting, ore and ..... perimeter. The cross-sectional area and perimeter must balance the need to meet production.

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Adapting oil and gas drilling techniques for the mining industry with ...

Adapting oil and gas drilling techniques for the mining industry with ... (2) pit perimeter wells to intercept and remove groundwater moving toward the mine, and ... However, directional well placement in hard rock mining has a very limited track ...

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Techniques of Controlled Blasting - SlideShare

Dec 17, 2009 ... In both the mining and construction industries, blasting is the predominant ... As compare to line drilling technique trim or cushion blasting is ... Smooth (contour or perimeter) blasting: A technique used mostly in underground ...

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Draft Guideline - Barring Down - Department of Mines and Petroleum

Underground Barring Down and Scaling. Document ..... block using a method of remote drilling, charge the holes with explosives and fire down .... A large number of mines in WA use drill jumbos to remove rock from the excavation perimeter.

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Controlled Fragmentation and Contours in Rock Blasting - DiVA portal

technology, in mining concerning rock fragmentation by blasting (especially underground in ..... because it is difficult to drill a straight 2-mm diameter borehole to a length of 250 ...... Only the perimeter holes were blasted against the opening left.

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Measurement-while-drilling technique and its scope in design and ...

International Journal of Mining Science and Technology .... Values of A = 7 for medium rock, 10 for hard, highly fissured rocks and 13 for hard ..... As per their study, based on perimeter blasting rounds, the RQI for rotary drills was expressed as:.

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the history of down-the-hole drilling and the use of ... - Geosystems LP

Until quite recently, this rotary percussive drilling method ... underground mining company, owned by the Swedish Government and providing about. 90% of the ..... PCD (Poly-Crystalline Diamond Composite) bits limit wear on the bit perimeter.

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Thermal Fragmentation Mining Method - Nippon Dragon Resources

Since less rock is extracted, important savings are realised throughout the entire chain of ... Thermal fragmentation mining process requires a 3 person team. ... Series of 6 inch (15-cm) pilot holes drilled into the vein with conventional drill; Thermal ... Vibration blasting control; Perimeter blasting and stress reduction; Drift cuts ...

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Jackleg rock drills used in Bisbee Arizona - Minerals, Mining Geology ...

Bisbee mines were slow adopters of changes in drilling technology and ... The Jackleg momentously changed underground mining and soon became .... in soft ground that plug's the drill steel a bit with holes on its perimeter would be chosen.

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Crawler Mounted Water Well Drilling Rig | Affordable DTH&Core Rigs

Crawler Mounted Water Well Drilling Rig Manufactured in Hardrock is light weight, ... mining exploration, as well as offshore drilling, the DTH crawler drilling rigs ...

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Drilling in hard rock - Morath GmbH

Quarries, mines and tunnelling all involve strict standards of economising. ... Drilling into hard rock is performed based on the principle of rotary percussive drilling. ... kind seen in other drilling methods, because in this case the drill is only sunk ...

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Drilling for Underground Excavation and Support in Sedimentary Rock

Drilling for Underground Excavation and Support in Sedimentary Rock. G.Nord ... 1.1 Drilling technology. It is well known that ... never used in under ground construction and mining. .... Large holes are drilled in the future roof perimeter, later.

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Blast Hole Drilling: The Basic Process | RPM Drilling

Aug 24, 2017 ... Blast hole drilling is one of the primary surface drilling techniques ... In underground mining, the tunnel will be cleared of debris, and the tunnel will be ... Smooth, Perimeter or Contour blasting in underground mines, and muffle ...

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Reduction of exposure to rockfalls in underground metalliferous mines ...

Due to the different geotechnical domains that exist in an underground mine, the blanket application of one particular rock-bolting pattern or method may not .... lower density explosive products are used in appropriate perimeter drill patterns.

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CDC - Mining Project - Blast Damage Control to Reduce Injuries ...

Feb 15, 2018 ... The centerpiece of modern drifting is the drill jumbo, allowing the operator ... Controlled blasting reduces perimeter damage, and less perimeter damage ... Rock blasting techniques in underground metal/nonmetal mines need ...

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(PDF) ROCK BLASTING FOR MINING - ResearchGate

Apr 16, 2017 ... mining or underground mining methods. ... Hence drilling and blasting are considered to be the first phase of the production ..... Smooth blasting (contour or perimeter blasting) for underground mines and muffle blasting as a.

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Understanding Hard Rock Mining: Terms and Methods—Part I - June ...

To better understand the complete process of hard rock mine operations, it will also be necessary ... How long does it take to hand drill all the holes for a blast?

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