In most civil construction blasting projects and some quarry sites, where measurement is conducted in the near field (ie the distance to the monitor is comparable to the blast dimensions), a good blast designer can use advanced blasting techniques to channel vibration frequencies above 35Hz and thus the limit of 25mm/s would apply.
Blasting today is not simply about breaking the rock into manageable pieces, but properly fragmenting and placing that rock to minimise overall quarry costs and environmental effects. • Anthony Konya is the senior …
Except for very deep-seated deposits, open cast mining method has been recognized as the safest and most productive mode for mining minerals. Ever growing demand in minerals and coal has compelled the mine operators to increase the size of mine, which has resulted in an increasing trend towards large capacity open cast projects. Explosives and …
In this study, we investigated the impact of quarrying as an environmental ethical crisis. The need for the study arose when we realised the deteriorating effect of the quality of life in our community, which is located next to a limestone quarry. To obtain a deeper understanding of the adverse impact on the environment and the quality of life of the people living in the …
A quarry is a place where different types of stones are extracted. ... This becomes especially important when blasting method has to be used for quarrying of stones. (iii) Distance from main roads: Stones extracted from a …
The most widely used explosive for aggregate quarry blasting is a mixture of fuel oil (FO—6%) and ammonium nitrate (fertilizer) (AN—94%); this mixture is termed ANFO (Box ... was developed through pilot galleries and the conclusions established a room and pillar method as the best underground method for the extraction of the limestone rock.
Blasting operation is considered as one of the cheapest methods to break the rock into small pieces in surface and underground mines. Ground vibration is a side effect of blasting and can result ...
The extraction of limestone from these quarries involves significant drilling and blasting operations, a predominant excavation method compared to mechanical methods.
The method of digital photo analysis was used to determine the fragment size distribution after blasting and be back analyzed using data on joint orientations and roughness measured by photo-analysis. ... The fragmented view of blast conducted at the 2nd bench of 'A' Quarry of Sagmania and Birhauli Limestone ... Rockwell EH (1927) Vibration ...
This paper employs the monitoring results of blasting activity at the Ninh Dan limestone quarry situated in Thanh Ba district, Phu Tho province, to develop different forecasting models that ...
related to quarry or mining operations. e bulk density of limestone is 2.50 t/m 3, while the blasting agent (ANFO: Emulsion) has densities of 0.88 and 1.2 g/cc. e hole speci …
In present paper, the blast-induced ground motion and its effect on the neighboring structures are analyzed at the limestone quarry "Drenovac" in central part of Serbia. Ground motion is examined by means of existing conventional predictors, with scaled distance as a main influential parameter, which gave satisfying prediction accuracy (R > 0.8), except in the case …
To supply the plant with sufficient raw material in 2005 about 670,000 tons of limestone were extracted at the "Mormont" quarry by drilling and blasting. About 200,000 t were mined at the ...
The bench blasting operations may be classified according to their purpose and also it can be classified by the diameter of the Blast Hole (Jimeno et al, 1995), whereby; • Small diameter Blasting ranges from (65 – 165) mm • Large diameter Blasting ranges from (180 – 450) mm Since the subject of this research is conventionally based on ...
A pictorial view of one of the blasting operations carried out during the time of this study is presented in Fig. 4. After taken these readings, the Ewekoro village was visited to see the level of structural damage that might have resulted from the ground vibration induced during the blasting operations in the limestone quarry.
By utilizing controlled explosions, miners fracture rock masses, facilitating their extraction and subsequent processing. Blasting is a cost-effective and time-efficient method that significantly increases productivity in these industries, enabling the extraction of essential raw materials that fuel various sectors of the economy.
This paper reports the effect of type of the explosive and blast hole diameter on the boulder count in limestone quarry blasting. In all, 264 blasts using ANFO or SME explosives have been ...
For the first rock prediction method, the consumption in the year 2000 is 132.2 ... Fig. 4: The input data of bench blasting for the large limestone quarry and its output results
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.
For years, the limestone was extracted by drilling and blasting and then wet processed into clinker in the cement plant. In a move to increase productivity and reduce costs, IFCEM became the first cement plant in the Ukraine to initiate the transition from the wet process to a dry process, a measure that optimized the mining method for material supply.
Blasting operations In blasting operations, emulsion and ANFO (blasting agent), gelatine dynamite (priming) and delay detonators were used as explosives in the quarry. During the study, blast holes of 12.5 m length (the usual design before this work) and 89 mm diameter were drilled for the first 35 shots.
plaster stemming method in three different limestone quarries and one clay quarry. The new method employs a plaster prepared as a thick paste, which hardens in less than 25–30 minutes after application. The hardened plaster creates a very strong plug, therefore the stemming column length can be reduced and the explosive column length increased.
These subsequent explosions separate the stone block from the quarry wall. If blasting is being used as the last step to completely detach the stone block, the block may actually jump up to 18 inches as a result of the impact from the explosions. ... The ancient Egyptians used a wedge and feather method for their limestone blocks, and even then ...
Dimensional stone quarrying demands consistently straight holes. DTH hammers offer more precision to hole straightness than top hammers. Dimensional stone operations typically drill smaller size holes of 3 ½ to 4 in. in limestone, granite, and marble.
The quarry site is situated close to the Bijar city in western Iran. Limestone deposit of pliocene age is the main deposit of the quarry. The quarry consists of horizontal bedding planes in nature. The limestone is medium-hard and has uniaxial compressive strength of nearly 80 MPa and a density of 2450 kg/m 3.
In blasting, a number of variables are easily under the control of the blaster, including the burden, spacing, stemming, subdrill, and timing. In …
Afeni TB, Osasan SK (2009) Assessment of noise and ground vibration induced during blasting operations in an open pit mine—a case study on Ewekoro limestone quarry, Nigeria. Min Sci Technol (china) 19(4):420–424. Agyei G, Nkrumah MO (2021) A review on the prediction and assessment of powder factor in blast fragmentation.
Quarrying can be done by three methods as follows: Hand tools. Machine quarrying. Blasting. Quarrying of Stones using Hand Tools. In case of soft stones or for smaller works, quarrying is done by using hand tools. There are various …
Controlled blasting in a limestone mine using electronic detonators: A case study ... timing of detonations are two technological breakthroughs which have had an important role in updating drilling and blasting excavation methods, …
The plaster stemming method investigated in this study is found to be better than the drill cuttings stemming method due to increased confinement inside the hole and better utilization of blast explosive energy in the rock. The blasting tests were carried out in one clay quarry and one limestone quarry.
The most widely adopted method of limestone mining is through opencast pits with bench formation. ... used to mine limestone. As no drilling and blasting. ... from the vicinity of limestone quarry ...
2 limestone quarrying and processing operations 1 1 2 3 2.1 limestone 2.2 limestone quarrying operations 2.3 limestone processing operations 3 lci methodology 4 43.1 4 lci data collection 3.2 quality of lci data set 3.3 lci boundaries 4 3.3.1 limestone quarry operations 4 3.3.2 limestone processing operations 5 4 lci results 5 references 23
The main advantage of the new stemming method is the reduction in the cost of blasting. At a limestone quarry, blasting costs per unit volume of rock were reduced by 7%. This is obtained by increasing burden and spacing distances. …
This project conducted in order to analyses the optimization of drilling and blasting parameters to influence achievement of good fragmentation at Songwe II Limestone quarry.
This research was carried out as a practical method to determine the design parameters giving desired fragmentation and cost in a limestone …
The blasting results of two stemming method were compared. ... At a limestone quarry, blasting costs per unit volume of rock were reduced by 7%. This is obtained by increasing burden and spacing ...
