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powder factor limestone mines

powder factor limestone mines

Blasting and Explosives Quick Reference Guide 2010

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.

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Selection of Powder Factor in Large-Diameter Blast Holes

Selection of Powder Factor in Large-Diameter 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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Chapter 8 BLAST DESIGN - National Park Service

pounds, there are several possible combinations that can express the powder factor. Powder Factor = Tons of rock (or cubic yards) per pounds of explosive. Normal range = 4 to 7 Shallow holes = 1 to 2 External loads = .3 Tons of Rock = Powder Factor lbs of Explosives The higher the powder factor

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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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Engineering Geology Field Manual - Volume II - 2nd Ed .

factor in determining how much explosive is needed to displace a given volume of rock (powder factor). The burden-to-charge diameter ratio varies with rock density, changing the powder factor. The average burden-to- . Limestone 2.5 to 2.8 156 to 174.7 2,500 to 2,800

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Determining minimum burdens for quarry blasting

The use of Powder Factor in blast design The Powder Factor can be used to design the distribution of explosives in the rock mass that is to be blasted. The critical dimension is the burden distance which is the shortest distance to stress relieve when a shot-hole

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Blasting mechanics: Material properties and powder factor .

Apr 17, 2019 · Powder factor is the amount of explosive (pounds) to the total amount of rock blasted (tons) to develop a scale which some use to develop a blast design. This system is called a powder factor design approach, and it is an extremely poor approach to designing a blast.

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Study on optimum powder factor and quality of explosives .

The optimum powder factor in most of mines in CIL was recorded. 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.

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Hard Rock Miner's Handbook - stantec

Mining industry response to the book continues to be incredible. Thanks in large part to the efforts by John Chadwick of the Mining Journal, infomine, and many other members of the mining community, the Hard Rock Miner’s Handbook has been distributed to over 113 countries worldwide. Web hits and downloads continue as students and

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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 rourkela-769008

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