perimeter drilling techniques in hard rock mining inservice training 2013

mining engineering in service training opportunitiexs ...

mining engineering in service training opportunitiexs. Mar 16, 2016· Mining Engineering courses are available at various levels that include. Diploma Courses in Mining and Mine Surveying Engineering – 3 years course. Eligibility Criteria – Qualifying examination should be 10th/equivalent exam with minimum 50% marks. B.E./ B.Tech in …

Development of overbreak prediction models in drill and ...

2017-4-26 · According to the human requirement, such as mineral extraction, transportation, etc., tunnel construction is an evident need. Mining and tunneling activities are full of problems with uncertainty, which make these problems complex and difficult. Overbreak is one of these problems that we are encountering in the tunneling process, particularly in the drill and blast method. Overbreak causes to ...

Explosives Engineers'' Guide

2020-4-22 · Spacing = 15 x Hole diameter (hard rock) 20 x Hole diameter (soft rock) Burden = 1.25 x Spacing Fire as many holes as possible on one delay. Stem holes. Powder factors Typical powder factors Rules of thumb used in mass blasts Rock type 3PF (kg/m) Hard 0.7 – 0.8 Medium 0.4 – 0.5 Soft 0.25 – 0.35 Very Soft 0.15 – 0.25

An empirical approach of overbreak resistance factor for ...

2019-10-1 · 1. Introduction. Drilling and blasting has been the primary method to excavate a rock mass in civil and mining projects since the first industrial blasting using black powder in the early 16th century (Buffington, 2000) spite the poor drilling and explosives technologies in that era, the advantages of blasting, i.e., fast and effective rock breakage, were compelling enough to replace the ...

Techniques of Controlled Blasting

2009-12-17 · 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 …

(PDF) pre-conditioning | thabo matsomane

University of Johannesburg Department of Mining Engineering Module name MINING TECHNICAL SERVICES IVA Module code MTLA411 PRE-CONDITIONING BLASTING TECHNIQUES AS APPLIED TO THE ROCK MASS SO AS TO HAVE CONTROL OVER THE BEHAVIOUR OF THE ROCK MASS IN: DEEP LEVEL NARROW STOPING DEEP LEVEL HIGHLY STRESSED TUNNELS CAVE MINING Student name BT MATSOMANE Student number 200918241 Due date 12 APRIL 2013 ...

LOTO Safety: The 6 Steps of Lockout/Tagout

The Purpose of Lockout/Tagout and LOTO Safety. When machines or equipment are being prepared for service or maintenance, they often contain some form of "hazardous energy" that can cause harm to people in the area. When we talk about hazardous …

Loncor Resources Inc.: Form 20-F

2017-9-22 · Minimum mining true thickness of 1.5 metres. *Cut-off grade estimated using a US$1,500/ounce gold price with appropriate cost parameter assumptions for mining and other economic factors. In terms of material type, approximately 9% of the total mineral resources are in oxides, 6% in transitional and 85% in fresh rock.

Controlled BLASTING | Drilling | Mining

2020-12-29 · 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 ...

Conferences | ISRM EUROCK | OnePetro

Hard Rock Tunnelling with Tbm for the Safety Gallery of Existing Frejus Motorway Tunnel in the Alps Between the Regions of Savoie in France and Piedmont in Italy. F. Corbetta. Paper presented at the ISRM International Symposium - EUROCK 2020, physical event not held, June 2020. Abstract.

Smooth Wall Blasting

A runaway reaction between sulphide minerals and ammonium nitrate can lead to the spontaneous and premature detonation of one or more blast holes at any time from a few minutes to several days after loading. Learn more. Fume risk reduction. The generation of nitrogen oxides within post-blast gases (commonly referred to as "fume") has become ...

Trenching and Excavation Safety

2020-10-1 · research, information, education, and training in the field of occupational safety and health." Material contained in this publication is in the public domain and may be reproduced, fully or partially, without permission. Source credit is requested but not required. This information will be made available to sensory-impaired

(DOC) Brief history of mineral exploration and mining in ...

Theo M van Leeuwen. IntroductionSumatra, the world''s 6th largest island, has a history of mineral exploration and mining that goes back to pre-historic times. Throughout its history the local population has been involved in gold mining, both alluvial and hardrock, but their activities are poorly documented, and therefore are only briefly ...

Underground (Hard Rock) Mining : OSH Answers

2021-8-4 · 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 ...

Controlled blasting for long term stability of pit-walls ...

Controlled blasting techniques were used to control over-breaks and to aid in the stability of the remaining rock mass at Rampura Agucha open-pit mine in India. The mine is a lead zinc mine producing 5.95 mtpa of ore and has recently started its underground part, which is slated to produce 4.5 mtpa of ore in near future. The mine is currently working at 260 m depth, and is designed to reach a ...

(PDF) Underground Blasting Optimization by Artificial ...

Drilling and blasting is recognized as the most economical method in hard rock mining and it has been widely appl ied both surface and underground mini ng. Over the past few de cades, t he

Publikationer & forskningsrapporter

BeFos forskningsrapporter finns tillgängliga för fri nedladdning (PDF-filer). Ingen inloggning krävs för att söka och ladda ner filer. En del äldre forskningsrapporter kan beställas endast tryckta. Även kortversioner av BeFo rapporter finns att läsa/ladda ner - för rapporter utkomna 2013 och framåt.

(PDF) ROCK BLASTING FOR MINING

The basic objectives of this report is. to highlight the principles and practices a dopted in rock blasting operations for mining sectors. 2. The aspects concentrated in this report …

What are the techniques and hazards in drilling and blasting?

2021-4-13 · 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. In modern day operations, mechanical rockdrills are predominantly used.

(PDF) Rock Blasting in Underground Mining

Muckpiles of DSB and ordinary rings after blasting in two drifts 496 and 499 on level AL992. (a) Muckpile of DSB ring No. 496-r16 after blasting (0% extraction); (b) muckpile of ordinary ring No ...

Jackleg rock drills used in Bisbee Arizona

Besides drilling, jack legs are used to install rock bolts. Rock bolts are a used mostly for roof/rib support. The types of bolts used in Bisbee mine were the slot/ wedge, expansion and split set. The basics of rock bolting are drill a hole, insert rock bolt into hole and tighten rock bolt.

Rock Fragmentation Size Distribution Prediction and ...

2021-1-22 · In hard rock mining, the excavation by means of blasting usually involves the design of blasting parameters, drilling of a borehole, placement of an explosive charge, stemming, blasting, loading, and hauling [].Rock fragmentation has been a concern for many mining workers because it is one of the most important indicators of mining blasting.

In-Situ Leaching

2018-5-17 · Drilling methods are always evolving and being modified as new ways of drilling more productively are developed. The current drilling methods at San Manual are summarized below. Production wells for well-to-well leaching are drilled vertically with and rotary techniques…

Mine dewatering techniques

2013-11-23 · Underground Mine Dewatering Techniques • In hard rock mines drain holes may be drilled out from workings • In order to minimise water treatment requirements it is important to reduce generation of ''dirty water'' (that has run along the floor/walls) and …

Blast Hole Drilling: The Basic Process | RPM Drilling

2017-8-24 · 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 …

Onur Tuncay

View Onur Tuncay''s profile on LinkedIn, the world''s largest professional community. Onur has 7 jobs listed on their profile. See the complete profile on LinkedIn and discover Onur''s connections and jobs at similar companies.

Blasting Techniques Used in Underground and Opencast …

2021-8-12 · Pull per round – 1.06 m. Coal yield/kg of explosive – 2.0 te (soligex) Coal yield/detonator – 0.9 te. One driller and two helpers drill 60-70 holes in a shift of 8 hours; one shot firer, 2 explosive carriers and 1 stemming material carrier constitute the blasting crew and fire nearly 60 shots in a shift of 8 hours.

Importance and Sensitivity of Variables Defining the ...

2021-5-30 · Blast induced damage to the final wall of rockmass in any civil or engineering application is a major concern to the rock excavation engineers. There are at least four distinct techniques practised by blasting engineers to minimise the damage to the parent rock during blasting that are classified as contour blasting. One of the methods to achieve a smooth wall or rock …

(PDF) AEL Product Catalogue | Rodrigo Venegas

In addition, AEL offers underground was established in 1896 and has over the years become mobile and fixed emulsion pumping systems. one of the world''s leading suppliers of explosives and initiating systems. With 15 companies in AEL, the group AEL …

Development of large diameter drilling equipment (Phase II ...

Development of large diameter drilling equipment (Phase II). Volume II: bit feature test. Final report

Application and prospect of hard rock TBM for deep …

2018-3-1 · Its best monthly advance rate reached 560 m. This is the first TBM boring line for full face hard rock roadway in a vertical shaft mine, the advance rate and construction quality were much better than the traditional dill-&-blast method, and provided sufficient time for gas extraction.

Books

2021-7-24 · Support of Underground Excavation in Hard Rock This is a comprehensive and practical work which also gives access to user-friendly computer program.. $77.00

Ground behaviour analysis, support system design and ...

2020-2-1 · Since 2013, he has worked on geomechanical aspects of deep underground hard rock mining-related research at Western Australian School of Mines (WASM), Curtin University. Prof. Xia-Ting Feng received his PhD at Northeastern University of Technology (namely Northeastern University since 1992), China in 1992 and then took the position of lecturer ...

Assessment of drilling inaccuracy and delineation of ...

2021-2-1 · The drilling designs presented in Fig. 2, Fig. 3 and the blasting design Table 2 were followed on level and ramp drivage excavations. In order to study the drilling inaccuracy the blasting parameters such as type of explosives, charging pattern, timing, and sequence were kept similar throughout the …