bottom charge, powder Factor for limestone quarry at Al Ain El Sukhna – west of Gulf of Suez according to field trial tests. 1. Introduction In surface mining drilling and blasting are the major unit operations and have a big effect on the materials fragmentation, safety and total production cost. Drilling and blasting cost in any

Almost for a decade rock breakage of limestone powder factor was improved from 6.5 t/kg to 15 tons/kg. Drill factor was maintained around 75 tons/m. Analysis indicated and powder factor was changed to 13.8 t/kg. Crusher productivity increased from 932 tons/hour to 1369 t/hour. Reduced ground vibration to 4mm/s. Controlling fly rock and dust.

Oct 2011 - Sep 20121 year. Kolkata Area, India. Worked as the Project Lead on multiple projects in Coal, Iron and Limestone sectors to deliver on the KPIs of associated projects and trained the on-site teams of engineers for routine operations. • Achieved a drill & blast cost reduction of over 5% at one of the largest private coal mine in ...

Limestone 2.5 to 2.8 156 to 174.7 2,500 to 2,800 ... A higher powder factor seldom will correct this problem; it will merely cause the blocks to be displaced farther. Usually, the best way to al- ... blasting techniques require constant study of the geology to make every effort to advantageously use the geology, or

The area falls under survey of India ... to 25% is used to boost entire column of explosive with powder factor 8.0 to 8.5 Tonnes/Kg of Explosive. 03. LEVELING BY DOZER After blasting, blasted material will be dozed at face, which helps for safe loading in ... The mining limestone is possible only after handling waste rock. The

Jul 12, 2015· The present paper summarizes the application of two different types of stemming material used in bench blasting. The two stemming material types, namely crushed aggregate and drill cuttings were opted in the present study. The blast trials were conducted on overburden rocks of Garnet Biotite Sillimanite Gneiss (GBSG) formations in one of the largest …

A term typically used in coal mining to refer to a separate process of overburden removal, prior to the main pass of the dragline or stripping fleet. Production Blasting. The type of blasting most commonly used in a mine, as distinct from development, trim, presplit, ramp or other special blasts. Powder Factor

Jun 01, 2017· Good correlations were obtained between average layer thicknesses and blast fragment size, power factor (t/kg) and charge factor (kg/m 3 ). Mean fragment sizes less than 100 cm were obtained with the average layer thickness of limestone beds less than 80 cm. The powder factor more than 14 t/kg was achieved with layer thickness less than 200 cm.

2.3.2. BLASTING The limestone deposit is moderately hard in nature like the country rock and therefore they will broken into pieces of portable size by drilling and blasting using Jack hammer with compressor by shot hole blasting. Powder factor of explosives for breaking such hard rock shall be in the order of 5 Kgs .of explosives.

Blasting is one of the critical operation in any excavation system in mining, was dependent on conventional methods of analysis till new technologies made in-roads in last few decades period. Digitised Terrain Models (DTM) are developed based on images captured of mine terrain and mine faces(as a part of pre-blast and post-blast situations).

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Example, granite, basalt, sandstone, limestone, conglomerat, breccia, schist, etc. Rock Blasting Technique – Mining Engineering Department Seismic velocity vs excavation method • Seismic velocity Exacavation Method Description (mps), < 450 No ripping Soft rock, heavy weatherd 450-1200 Soft ripping Soft rock, medium weathered, Percistence ...

Aug 28, 2019· P&Q University Lesson 4: Drilling & Blasting. The initial production steps in a quarry operation – drilling and blasting ­– can significantly impact the productivity and costs of most downstream operations, including loading, hauling, crushing and screening, and product yield – the relative volume of high-value crushed stone products ...

Theses and Dissertations--Mining Engineering Mining Engineering 2017 ESTIMATING THE EFFECTS OF BLASTING VIBRATIONS ON THE HIGH-WALL STABILITY Abhinav Sharma University of Kentucky, [email protected] ... Approximate Powder Factor in Cushion Blasting (C.J. Konya, 1980)..... 28 Figure 2-14: Section-view of Non-Pre-Split Final Design ...

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TERMS & DEFINITIONS: A. AC Alternating current.. ACCEPTOR A charge of explosives or blasting agent receiving an impulse from an exploding donor charge.. ADOBE CHARGE A mud covered or unconfined charge fired in contact with a rock surface without the use of a borehole.Synonymous with BULLDOZE, MUDCAPPING, and PLASTER. AIRBLAST The …

Powder Factor In Blasting Lime Stone Mining India. Blue Stone Quarry Blasting In India-India Crusher&Mill blue stone quarry blasting in india; tips for stone quarrying & crushing in india. ... powder fa. Get price

Oct 12, 2012· POWDER FACTOR. In construction blasting, powder factor (PF) is expressed as quantity (unit mass) of explosive per unit volume of material blasted. For mining, it is usually expressed as quantity of explosive per ton of material (or sometimes tons of material per unit mass of explosive). Fig – 5.

The actual mine data in respect of different mining parameters was collected and a time motion study was carried out. Data analysis for a few important parameters is summarized below: 3.2 Situation Analysis Blasting : The powder factor is found to be highly variable. Drilling : The yield per m is found to be low and there is 40% spare drilling ...

The area falls under survey of India ... about 20 to 25% is used to boost entire column of explosive with powder factor 8.0 to 8.5 Tonnes/Kg of Explosive. 03. LEVELING BY DOZER After blasting, blasted material will be dozed at face, which helps for safe loading in ... The mining limestone is possible only after handling waste rock. The

2.2.7. Powder Factor . Powder factor is defined as volume of rock broken (m. 3) per unit charge amount (kg) consumption and depends on parameters as volume of rock, charge amount, explosive strength, drilling diameter, rock type, geological weaknesses, etc. Specific charge is just reciprocal of powder factor. Powder factor

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Optimization of blast is dependent on a host of complex factors related to the rock, explosive, initiation, drill-hole parameters and their layout. The present work is a step in the direction of developing a suitable blast model, with simple methodologies which can be adapted by the mining industry to achieve better blasting results.

The cell powder factor does not account for timing within a blast and does not easily handle non-parallel blast hole configurations. The cell powder factor is best used as a design or audit tool ...

folds, faults, caves, and filled joints influence blasting and mining in lime­ stone and dolomite quarries. The quarry operators attempt to minimize l Geophys ic is t. aunderlined numbers in parentheses refer to items in the list of references at the end of this report.

Surface limestone mining. All over the world, the limestones are generally mined from a quarry or the open pit mining. It is the easiest way to remove the limestone without causing much destruction. In surface mining or open pit mining, the top soil and the overburden covering the mineral is removed. Then by the process of drilling the rocks or ...

Drilling and blasting is the controlled use of explosives and other methods such as gas pressure blasting pyrotechnics, to break rock for excavation.It is practiced most often in mining, quarrying and civil engineering such as dam, tunnel or road construction.The result of rock blasting is often known as a rock cut.. Drilling and blasting currently utilizes many different varieties of ...

Jul 21, 2014· ASSESSMENT OF POWDER FACTOR IN SURFACE BENCH BLASTING USING SCHMIDT REBOUND NUMBER OF ROCK MASS Bhanwar S. Choudhary1, Kumar Sonu2 1. Assistant Professor, 2B.Tech Student, Department of Mining ...

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Results of the study, therefore, showed that the company's quarry has limestone of medium strength range of 30Mpa-50Mpa which requires a powder factor of between 0.4kg/m 3 and 0.6kg/m 3 or 0.22kg ...

OPTIMUM POWDER FACTOR SELECTION IN BLAST HOLES AT DANGOTE LIMESTONE QUARRY, OBAJANA, NORTH-CENTRAL NIGERIA 1Salati, L. K. and 2Mark, G. O. 1Department of Mineral and Petroleum Resources Engineering, Kaduna Polytechnic, Kaduna, Nigeria 2Symbol Mining Company, Gwana, Alkeleri, Bauchi State, Nigeria Abstract This study …

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.