Blasting is the primary stage of rock size reduction after drilling and it is followed by crushing and grinding actions on the comminution system. The main objective of blasting action in the mine is to produce a fragmented rock …
One of the most fundamental stages in open pit mining is drilling and blasting. A good fragmentation and a minimu m ground vibration are characteristics of a successful drilling and blasting operation. In this study, 78 b lasting events of AlvandQoly limestone mine located in Kurdestan cement company in west of Iran were investigated. The vibrations …
BlastLogic's 3D visualisation and direct connectivity with site drill navigation systems allow engineers to track drill depth accuracy. An Australian coal mine wanted to quantify the impact of various blast plans on the operation. Existing methods relied on manual processes and inefficient software for analysing blasting results.
To optimize the drilling and blasting process in underground mining using the Holmberg method to create the drilling-and-blasting mesh design. The method it is an experimental applied-type and correlational-level inductive method. The Holmberg method showed good...
Therefore, authors of this article propose a new way of optimization of the drilling-and-blasting process by introducing new blast design modifications.
By gradually phasing out the drilling and blasting operations, the surface miners progressively reduced the time and cost involved in pre-crushing and post-crushing the material and also made it possible to redesign the deposit.
This article is tagged with Calvin J. Konya, drilling and blasting, School of Mines & Metallurgy at the University of Missouri-Rolla and posted in featured, Features
In conventional blasting when explosive is detonated, it releases huge amount of effective and non-effective energies that can produce gas and shock accompanied by light, heat, sound and pressure. The effective energy can act as a useful tool in breaking rock for mining and construction purposes. However, the non-effective …
This study also evaluate the effects of short and long inter-hole delay timing on blast performance and whether or not by changing of delay times improve rock fragmentation in full scale bench ...
Drilling and blasting are the two most significant operations in open pit mines that play a crucial role in downstream stages.
Request PDF | Latest Advancement in Drilling-Blasting & Rock Fragmentation Technology in Opencast Mines | The rock fragmentation process under current mining practices in India needs re ...
Drilling, without question, is certainly one of the more common occurrences in mining today. In fact, as every mining company knows, without drilling, there wouldn't be mining. The days of picks and shovels are long gone. Drills and drill cores are the tools of discovery and regardless of whether it's for a future open-pit mine, or a deep and …
Normet has developed a range of charging and blasting solutions for mines, including the Charmec suite which was created alongside explosive manufacturers.
Blasting is the most efficient way of drilling for extraction of hard rocks. In open-pit mines, the bench blasting method is used for in situ lifting of rocks and their crushing to the desired size.
A new blasting approach of combined blastholes with different diameters is proposed to solve the problems of oversize boulders and rock toes in open-pit mine.
This paper deals with the controlled blasting techniques implemented to control overbreaks, blast induced blast vibration and to aid in the stability to the rock mass of highwall at Jayant Opencast Project of Northern Coalfields Ltd. The Jayant Opencast Project is a coal mine producing 15.5 mtpa of coal and 51.5 Mm of overburden is being …
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Drilling and blasting operations are used to extract the limestone for the urgent need to manufacture cement; lime and aggregate. Drilling and blasting have been associated with a number -of challenges like fly rocks, vibrations, slope instabilities and boulders.
He has also completed work for Kliprand and Alexander Bay Diamond Mines and on various projects along the West Coast. He also has an excellent record of drilling blasting holes for, inter alia, De Beers, Trans Hex and various diamond mines around Kimberley including Cape Lime.
The mine blasts 3.5 million tonnes of rock a year using modern open-cut hard rock drill and blast techniques.
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 [ 1 ]. Rock fragmentation has been a concern for many mining workers because it is one of the most important indicators of …
Rock Fragmentation by Blasting – a review The rock fragmentation process in mining currently being practiced in India needs re-examination to improve the productivity of the mine.
Drilling and blasting are the major unit operations in opencast mining. Inspite of the best efforts to introduce mechanization in the opencast mines, blasting continue to dominate the production. Therefore to cut down the cost of production optimal fragmentation from properly designed blasting pattern has to be achieved.
The present paper highlights some important fragmentation issues experienced in the limestone quarry blast rounds. In light of these major issues, the paper outlines influence of a few important ...
A typical example of a 3-D model of a surface mine is shown in Figure 5. Typically, sets of parameters associated with blasting pattern include: bench height, hole diameter, hole depth, burden ...
The purpose of drilling and blasting operations in surface mining is rock fragmentation. Drilling and blasting are the two key components in the overall rock fragmentation system, the first ...
P&Q debuts a four-part series with a reflection on drilling's centuries-old history and an exploration of exciting technology to come.
This research was carried out to find a possible way of optimizing the drilling and blasting operations in an open pit mine of Somair (Société des Mines de l'Air), in the Niger Republic. In order to optimize the drilling operation, the time taken by two drilling machines to accomplish the same task was analyzed statistically.
Blasting is a fundamental technique in rock quarrying, facilitating the extraction of rock materials. This process involves the controlled detonation of explosives strategically positioned within drill holes drilled into rock formations.
The Stemming of blasthole collars in surface mines with an inert material redirects blasting energy to the rock more efficiently. The stemming length is a function of many variables, such as stemming material, plug, explosive, etc. Excessive stemming causes increase in stiffness accompanied by excessive confinement and resulting in the …
For large quarries 6m × 7m is blasting pattern as optimized with 150mm diameter drill. Projected blast pattern is 4m × 4.75m. TH, DTH, rotary cutting and rotary crushing drills are evaluated. Some of the best practices at an aggregate quarry in Thailand for drilling include drilling accuracy, bench's surface flattening by auto leveling.
The use of blasting cost (BC) prediction to achieve optimal fragmentation is necessary in order to control the adverse consequences of blasting such as fly rock, ground vibration, and air blast in open-pit mines. In this research work, BC is predicted through collecting 146 blasting data from six limestone mines in Iran using the artificial neural networks …
Efficiency of drilling and blasting operations must contribute to the best overall economics of a quarry [11, 12]; therefore, variability of powder factor has potentials to improve surface mines ...
Perimeter blasting is a technique to reduce the overbreak/backbreak on a blast. It usually utilises decoupled charges in closely spaced blastholes.
PDF | On Dec 22, 2017, Roshan Kumar Patel and others published Assessment of Comparative cost of Continuous Surface Miner vs. Conventional Drilling and Blasting in major opencast coal mines | …
In blasting techniques programs, students apply scientific and mathematical theory to different types of blasting methods and explosive equipment. Techniques in blast hole drilling, blast design, accident prevention and environmental protection are …
After acquiring a previously loss-making opencast limestone mine, the new owner has implemented several changes to turn around the operation. One key modification, among many critical transformations, is the optimisation of drilling and blasting parameters which have, to a large extent, improved the utilisation of …
This study examined the selection of powder factor in blast holes at Dangote limestone quarry, located in Obajana, Kogi State, North-Central Nigeria. After preliminary field studies, ten (10 ...
Hilltop Energy offers blasting services and product supply to mines, quarries, and construction projects throughout Ohio, Michigan, Pennsylvania, New York. West ia, Kentucky and Indiana.
Emission of particulate matter is associated with various mining operations like excavations, construction of haul road and approach roads, drilling and blasting and transportation of minerals.
