(PDF) Environmental Hazards of Limestone Mining and

The most widely adopted method of limestone mining is through opencast pits with bench formation. ... It was found that water samples analysed from the vicinity of limestone quarry and cement ...

A novel environmental restoration method for an abandoned limestone …

1. Introduction. Mining provides important raw materials for national economic development and the progress of human civilization and is a mainstay industry of many countries and regions [].Moreover, open-pit mining is generally preferred in mining operations due to its applicability in all operable areas of exposed rock, minimum …

Evaluation and Prediction of Blast-Induced Ground …

Blasting is a vital operation in industries such as mining, construction, and quarrying. It involves the use of chemical explosives to break down rocks and other hard materials for various purposes, including the extraction of minerals and the construction of infrastructure [1,2,3,4,5].However, conventional blasting practices have significant …

Out With the Old, in With the New: The Modern Method of Presplitting

The typical load for a Precision Presplit is 1/10 to 1/3 the load of a traditional presplit. This method used to be based solely on experience, but recently has been developed into the design method known as Simplified Precision Presplit Design (Konya & Konya, 2016). ... limestone and sandstone. This method also works in weak rock types …

Webinar Summary: Guidelines for Perimeter Control and Pre …

Dewatering may be difficult or ineffective, so in cases where the ground remains saturated, please discuss the impact of high hydraulic pressures from the production blasting and what can be done to assure that those pressures do not pre-dilate the final wall when trim blasting or dilate the final wall past the presplit when presplit …

Natural Recovery of an Abandoned Limestone Quarry: Soil …

Limestone is an important raw material that is widely used for multiple agricultural and industrial purposes (Pamukcu, and Simsir, 2006). Rapid economic development and the growth of urban areas in many countries have increased need for limestone which, in turn, created many abandoned quarrying sites in urban areas offering unique challenges to …

A Comprehensive Review of Traditional, Modern and …

Presplit blasting is a useful method for many impacts in the drilling and blasting spaces. With this method, a curtain of fracture is created by firing the lightly charged holes before the main or primary production blast holes. Along the perimeter of the last excavation, holes are drilled consecutively [7]. ...

Out With the Old, in With the New: The Modern Method of …

Pre-Split Techniques: A Review

Pre-splitting can be defined as 'a technique using lightly charged, closely spaced holes to induce a fracture plane along a required design profile, which isolates …

(PDF) Application of cuckoo search method in 3D slope …

The Cuckoo Search (CS) is a very fast and efficient global optimization method to locating the slip surface which carried out by iteration. However, the Grid Search (conventional method) method in ...

Pre-Split Techniques: A Review | Agg-Net

The above method was used in a major trial at a limestone quarry some years ago. The quarry had used the conventional method for many years with good results. An area of the quarry was identified as being suitable for the trials. It satisfied the main criteria of being long enough to accommodate at least three good-sized blasts and …

Precision Presplitting: The Basics

For example, a highly jointed limestone quarry with 35-ft. benches needs to be presplit to provide a smooth final wall near a structure such as a crusher. The drill rig is capable of drilling a 3-in. hole.

(PDF) ROCK BLASTING FOR MINING

Face mapping and Point Load Test (PLT) were used to characterize the rock at the RP3 Lafarge Limestone Quarry. The explosives parameters and blast design used in this study are the …

Blasting and Explosives Quick Reference Guide 2010

Presplit blasting Spacing = Hole diameter x 12 Burden = 0.5 x production blast burden (B) Uncharged length at top = 10 x D 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)

Underground void detection by applying the electrical …

The usefulness of this method is demonstrated with an example field study where this method has been used to detect extensive voiding under the working floor of a limestone quarry in New Zealand. An approximately 15,000 m 3 area was scanned to capture significant voids considered to be a threat to machinery and personnel.

(PDF) Modified Presplit Blast Design and its

Seismic control of mine and quarry blasting in the USSR. Proc. 6th ISRM Conf. Rock Mechanics, Canada, 1987; 1: 617-619. Risk Management in the near vicinity of blasting V R Sastry

Understanding the connection between blasting and …

Presplit blasting involves drilling a single row of holes along the back of the final excavation zone [3]. Unlike smooth wall blasting, the presplit holes are fired on the …

Precision Presplitting – Design Aspects

The first study that was completed was calculating the explosive load for precision presplitting based on the rocks compressive strength (Konya & Konya, Precision Presplit Design, 2015). The compressive strength of the rock is the ability of the rock to withstand compression. The way a precision presplit functions is: 1.

The safe level blasting criteria from the USBM RI …

Evaluation of ground vibrations induced by blasting in a limestone quarry. Article. ... Changing the charge structure is also a conventional method [9][10] [11], with which presplit blasting can ...

Precision presplitting: the basics: precision presplitting is …

For example, a highly jointed limestone quarry with 35-ft. benches needs to be presplit to provide a smooth final wall near a structure such as a crusher. The drill rig is capable of drilling a 3-in. hole. The question then becomes, what blasthole spacing should be used and what would be the powder load? ... Using this method, even weak ...

AfriSam to open new limestone quarry at Ulco

The relocated quarry will be capable of providing security of supply for about 40 years and will need to deliver around two million tons of limestone to Ulco each year. According to Gavin Venter, manager Saldanha and Strategic Projects at AfriSam, the enabling infrastructure for this quarry has been significant.

A novel environmental restoration method for …

Combining the characteristics of this quarry with a summary of previous studies on environmental restoration work, this paper proposes a novel and systematic method that was comprehensively ...

Comparison of Presplit and Smooth Blasting Methods for Excavation of

In order to explore differences of presplit and smooth blasting, the comparisons of the two control techniques have been conducted by some scholars from several perspectives. Lu et al. compared the difference of presplit and smooth blasting from the difficulty of crack forming during the excavation of underground tunnel. The results indicated ...

Different charging patterns of blasthole. [A]. Blasthole with...

The outcome of the study has revealed that different soft computing (SC) methods are available for the assessment of rock fragmentation aside the traditional methods.

A Comprehensive Review of Traditional, Modern and …

Presplit blasting is a useful method for many impacts in the drilling and blasting spaces. With this method, a curtain of fracture is created by firing the lightly charged holes before …

APPLICATION OF CUCKOO SEARCH METHOD IN 3D …

Application of Cuckoo Search Method in 3D Slope Stability Analysis … Masagus A. Azizi et al. 59 Based on max columns in X or Y, SF value of the 3D CS results were then compared to the

P&Q University Lesson 4: Drilling & Blasting

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 …

Perú Universidad Nacional Mayor de San Marcos …

38 D T Ind. data 22(2), 2019 ANALYSIS AND ASSESSMENT OF CONVENTION AL AND PL ATFORM-BASED MINING METHODS ADOPTED AT THE UNACEM S. A. A. COMP ANY LIMESTONE Q UARRY do de plataformas secuenciales en el PIT II can-tera negro africano proyecto de rocas y minerales industriales (R. M. I.)-Calquipa S. A. C., states …

Limestone quarries and their environmental impact

Limestone is a fundamental raw material in various industrial sectors. It is formed due to biochemical precipitation of calcium carbonate, and further compaction over long periods of time.

(PDF) 05 chapter 3 rock excavation methods

Improving Drilling and Blasting Programms at Al Jazi Limestone Quarry. ... Figure 12 shows an example of a cut slope that used presplit basting methods which left visible half casts in the slope face. Presplit blasting requires relatively small drill holes, between 5 to 10 cm (2 to 4 in) in diameter because its goal is to create discrete ...