powder factor for aggregate mining

Reduction of Blasting Related Mining Process Variability

The graph below shows the change in distribution as the powder factor is increased or lowered. The optimum powder factor is 1.6 tons/lb and has 76.1% of the produced aggregate within the upper and lower limits. For reference, the 2.1 tons/lb has a 39.1% of aggregate

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Optimization of Blasting Parameters in opencast Mines

optimization of blasting parameters in opencast mines a thesis submitted in partial fulfillment of the requirements for the degree of bachelor of technology in mining engineering by manmit rout & chinmay kumar parida under the guidance of dr. h. b. sahu department of mining engineering national institute of technology rourkela769008

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Journal of Mines, Metals & Fuels jmmf.info

Aggregate consumption will be exceeding 350 MTPA by 2019. Aggregate quarry under study has proposed increased production from 2.5 MTPA to 5 MTPA. Drilling and blasting accounts for 28% of total quarrying cost based on the study of various aggregate quarries in Thailand. Powder factor values (P.F.) is 0.40 – 0.66 kg/m3 at 80% passing over 0.5m.

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A novel powder factor based bench blast design method for

A NOVEL POWDER FACTOR BASED BENCH BLAST DESIGN METHOD FOR LARGE SURFACE COAL MINES by ANDREW CLIFFORD BLAIR A DISSERTATION Presented to the Graduate Faculty of the MISSOURI UNIVERSITY OF SCIENCE AND TECHNOLOGY In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY in MINING ENGINEERING 2015

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Appendix E6 Canadian Environmental Assessment Agency

study done by Orica (refer to Appendix A 3.1 Powder Factor . 5 P a g e It is important to pick an appropriate powder factor that maximizes the diggability of the material. Muck blasted with too low of a powder factor results in particles that are blocky From here explosives will be delivered to the mining areas via Mobile Mixing Units

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Powder Factor University of Alaska Fairbanks

Powder Factor The following discussion shows a typical type of calculation involved in explosives engineering. Powder Factor is defined as the amount of explosive required to dislodge and fragment 1 cubic yard of rock. [3] The softer (less dense) the material that is being blasted the smaller the powder factor

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Study on optimum powder factor and quality of explosives

The powder factor in NCL, BCCL, SECL, ECL, WCL and West Bokaro Collieries was in range of the optimum powder factor and quality of explosives was measured. The rating index of bulk explosives is varied in between 70 and 100. The powder factor in hard rock was 1.5 to 2.5m3/kg and in soft rock it was in range of 2.0to 3.m3/kg.

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(PPT) MINIMIZATION OF BOULDERS DURING BLASTING AT OPEN

Powder factor is the mass of explosive required to break one cubic meter of insitu rock and expressed in FACTORS AFFECTING BLASTING PERFORMANCE Geology of an area Physical rock properties, rock hardness and rock structure . Controllable and uncontrollable factor Drilling pattern Physical selection parameter Explosive Powder factor Delay time

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Selection of Powder Factor in LargeDiameter Blast Holes

Selection of Powder Factor in LargeDiameter Blast Holes by Jack Eloranta 1995 Abstract This paper documents the relationship between material handling and processing costs compared to blasting cost. The old adage, "The cheapest crushing is done in the pit"

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Powder Factor what is powder Factor MINING GURUKUL

Jan 06, 2019 · In this video explain that what is powder Factor and how to calculate Powder Factor. Delay detonator https://youtu.be/NmHofjCf7nI Important questions for m

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Let''s Blast! Industrial Explosives During Blasting YouTube

Sep 12, 2018 · From the ninth century AD (though the historians are still uncertain about the exact date of its invention) to the mid1800''s, black powder was the only explosive available.

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Transverse longhole stoping QueensMineDesignWiki

Longitudinal longhole stoping is more favourable to transverse stoping in areas where ore thickness is diminished, or where narrow veins of ore are present. The orientation of longitudinal mining methods means that the hanging wall and footwall of the orebody will most likely form the sidewalls of the stope.

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factors in considering a site for limestone mining[mining

Considering these and various other factors it a powder factor of 3 to 4 . Methodology Wildlife Institute of India, Dehradun the study of the soil characteristics in and around the limestone mining complex become an important factor in the Environmental Impact factors in considering a site for limestone mining . aggregate mix plants

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Blasting models – what are they good for? Quarry

As shown in Figure 3, each of the two blast hole patterns have the same rock, structure, blast hole diameter, pattern, explosive type, powder factor and initiation sequence. The only difference is that the pattern on the right has a free face.

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A Pattern For Improvement AggNet

It is important to note that although the powder factor (0.26) is higher for B4, the dozing hours (5h) and the throw (12.10m) for this blast provide favourable results with no end breaks. This may be attributable to the use of stemming plugs in the last two drilling rows in B4, compared to blast B3 where they were used only in the last row.

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Powder innovation to assist blasting performance Quarry

Powder innovation to assist blasting performance Posted February 06, 2017 Dryshot, developed by Blastboss, is a blended powder product used as a multipurpose barrier to instantly seal off explosives from problematic water and mud in standard blast holes and stop stemming dilution into explosives in large diameter holes.

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Controlling fragmentation Orica Mining Services

00 International Mining SEPTEMBER 2012 FRAGMENTATION Orica took over management of the drill and blast operations and following a full assessment developed 18 distinct templates. The result was a greater than 30% improvement in production at a lower overall powder factor. To cite a different case, from Australia, the

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Blasting Technique World of Mining Professionals

The Vcut is used in numerous underground operations in the U.S. for aggregates mining. It is also used internationally, such as in underground coal mining in Brazil without the use of an undercut. Advantages of a Vcut The Vcut has numerous advantages over other cuts, if the space is available for them to function.

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Powder Factor what is powder Factor MINING GURUKUL

Jan 06, 2019 · In this video explain that what is powder Factor and how to calculate Powder Factor. Delay detonator https://youtu.be/NmHofjCf7nI Important questions for m

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Powder Factor University of Alaska Fairbanks

Powder Factor The following discussion shows a typical type of calculation involved in explosives engineering. Powder Factor is defined as the amount of explosive required to dislodge and fragment 1 cubic yard of rock. [3] The softer (less dense) the material that is being blasted the smaller the powder factor

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Pit Viper drilling for Africa''s iron Mining

Pit Viper drilling for Africa''s iron. Pit Viper and ROC L8 rigs from – is a key element for both the mines themselves as well as mining contractors. Dennis Stonefield, Appliions Manager with in Gauteng, points out that there are more than 30 Pit Viper rigs as well as ROC L8 units at work in the region with

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Economic evaluation of optimum bench height in quarries

Olafsson (1988). The powder factor also increases with the hole depth as the uncharged part of the hole (stemming) is compared to the bench height in lower benches. Blast unit cost values resulting from the cost calculations for various hole diameters for a quarry with an annual production capacity of 1 000 000 tons are demonstrated in Figure 7.

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Explosives Engineers'' Guide Dyno Nobel

Powder factor = 0.5kg per square metre of face Do not stem holes. Fire all holes on the same delay, or in groups of ≥ 5 holes Smooth Blasting 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

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Bench Blasting Design for Optimum Recovery of Blocks in

It is noticed that majority of the damage in the natural blocks are always from poor extraction method. In aggregate quarry, series of work have been done on powder factor that gives economical blasting. In this research work, breaking factor is used in place of powder factor since breaking is required not powder.

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Blasting mechanics: Material properties and powder factor

Apr 17, 2019 · Today, we still hold the same belief that powder factor is a useful tool for economic analysis but is a poor tool for the design of blasts because powder factor varies based on: rock type, rock structure, type of explosive, blast configuration, holetohole timing, rowtorow timing, bench height and stemming materials.

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H BLASTING IN SURFACE EXCAVATION Mining and Blasting

Powder factor or specific charge or blasting ratio: This is the ratio between the mass of explosives required to break a given quantity of rock and is normally expressed in kg/m3 or kg/t3. Table 1 is a guide to the powder factor for a given type of explosive in various types of rock.

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Bench Blasting Design For Optimum Recovery of Blocks In

KEYWORDS: Extracting, powder factor, aggregate, recovery, breaking factor. ABSTRACT: Dimension stone quarry is believed to be type of mining operation that always result to low recovery since what is expected from the extracting operation is a cubical block with no fracture. It is noticed that majority of the damage in the natural blocks are

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Controlling fragmentation Orica Mining Services

00 International Mining SEPTEMBER 2012 FRAGMENTATION Orica took over management of the drill and blast operations and following a full assessment developed 18 distinct templates. The result was a greater than 30% improvement in production at a lower overall powder factor. To cite a different case, from Australia, the

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A novel powder factor based bench blast design method for

"Large surface coal mines in Wyoming''s Powder River Basin ship millions of tons of coal per annum, moving millions of cubic yards of overburden to mine the coal. Much of this volume is blasted in the form of benches, a common mining technique. Increases in production and scale of equipment in the past thirtyfive years have created a paradigm shift for drill and blast personnel at these large

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Appendix E6 Canadian Environmental Assessment Agency

study done by Orica (refer to Appendix A 3.1 Powder Factor . 5 P a g e It is important to pick an appropriate powder factor that maximizes the diggability of the material. Muck blasted with too low of a powder factor results in particles that are blocky From here explosives will be delivered to the mining areas via Mobile Mixing Units

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How do you calculate powder factor? Answers.com

Powder Factor is the relationship of Explosives to Volume. It describes how much explosives are needed to blast a particular volume of rock. The easy formula is PF = (lbs of explosives used) / (yd

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Blasting mechanics: Material properties and powder factor

Apr 17, 2019 · Today, we still hold the same belief that powder factor is a useful tool for economic analysis but is a poor tool for the design of blasts because powder factor varies based on: rock type, rock structure, type of explosive, blast configuration, holetohole timing, rowtorow timing, bench height and stemming materials.

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Powder innovation to assist blasting performance Quarry

Powder innovation to assist blasting performance Posted February 06, 2017 Dryshot, developed by Blastboss, is a blended powder product used as a multipurpose barrier to instantly seal off explosives from problematic water and mud in standard blast holes and stop stemming dilution into explosives in large diameter holes.

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Reduction of Blasting Related Mining Process Variability

The graph below shows the change in distribution as the powder factor is increased or lowered. The optimum powder factor is 1.6 tons/lb and has 76.1% of the produced aggregate within the upper and lower limits. For reference, the 2.1 tons/lb has a 39.1% of aggregate

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UTILIZING BASIC STATISTICAL ANALYSIS AND

UTILIZING BASIC STATISTICAL ANALYSIS AND FRAGMENTATION ANALYSIS TO IMPROVE FRAGMENTATION Dave Lilly, P.E., MBA fragmentation analysis to changes in blasting parameters such as powder factor. (Cement and Aggregate) in this paper the data flow is as follows. Swell Factor Powder Factor Fragmentation

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Powder innovation to assist blasting performance Quarry

Powder innovation to assist blasting performance Posted February 06, 2017 Dryshot, developed by Blastboss, is a blended powder product used as a multipurpose barrier to instantly seal off explosives from problematic water and mud in standard blast holes and stop stemming dilution into explosives in large diameter holes.

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