(PDF) Evaluation and optimization of blasting …
... In open-pit mining, subaerial boulders are large rock fragments often formed during excavation and bench blasting, due to inefficient rock breakage. These types of boulders are a...
Open-Pit Mine Geological Model Construction and Composite Rock Blasting
The size distribution characteristics of fragments formed after loose blasting in open-pit mine will directly affect the economic benefits of the mining enterprise. The impact load test of coal ...
Addressing common challenges in drill and blast
Sites are very familiar with the common issues faced on every blast: 1. Difficult areas may not be blasted. This could be due to a range of factors, including: • Holes not drilled to design, missing holes or short holes. • Excessive fallback. • Damaged or destroyed drill holes. • Drill holes not loaded. 2.
Full article: Prediction of fly-rock during boulder blasting on
Hasanipanah et al. (Citation 2017) presented prediction of fly-rock in bench blasting at Ulu Tiram quarry Malaysia using regression tree method and compared the results with multiple linear regression (MLR) (Table 2).They suggested that the regression tree is a simple method compared to a complicated technique like ANN in terms of classification, …
Applicability of Controlled Blasting in Large Opencast Mine at
This paper deals with the controlled blasting techniques implemented to control over-breaks, blast induced blast vibration and to aid in the stability to the rock mass of …
Bench Blasting | SpringerLink
Usually, lower height of bench (equal or less than 5 m) is suitable for small blastholes and 10–15 m high bench is used for moderate to large-scale rock blasting. In bench blasting, the ratio of the bench height to the burden, H/W in Fig. 8.1, is an important concept—the stiffness of the bench, and it has great influence on the results of ...
(PDF) ROCK BLASTING FOR MINING
In mining operations, blasting has become a routine work. With proper understanding of the rocks and blasting methods, the …
Three reasons why your primary crusher feed contains oversized …
There are three critical things that need to be looked at to ensure that your feed does not contain oversized rocks which can cause unplanned downtime. 1. Difficulty detecting changes in ore type and ore mass characteristics. Problem: The mass of material that you are blasting (blasting polygon), appears to be the typical ore type, therefore ...
Measurement and control of seismic effects in large scale dragline
Large scale dragline bench blasting is prevalent in many surface mines in India. Blasting in benches as high as 30–50 m to obtain a dragline cut measuring, typically, 80 m in width and 200 m in length requires 250–300 tonnes of explosives. Such a large amount of explosive induces severe seismic effects on the highwall.
Investigation of Rock Joint and Fracture Influence on Delayed Blasting
In this paper, delayed blasting on a highwall bench at an open-pit mine is used as an example; a nonlinear joint blasting model is also constructed. ... Because of the rapid development of mine operations, mining technology has become a process that adapts to changes in ore body, rock conditions, and operational requirements. Currently, …
Effect of Delay Time and Firing Patterns on the Size of
Rock blasting is the rock excavation and fragmentation technique most widely adopted in the various fields of the mining, civil and construction industries because of its efficient, and economical aspects [].On the other hand, in case that the blasting operation may have an obvious impact on the surrounding environment, such as ground …
Optimized design of drilling and blasting operations in open pit …
1. Introduction. Mining activity is mostly represented by these four main operations: drilling, blasting, loading and hauling. For a proper mine planning and design, all of these operations need to be carefully planned in such a manner that can prevent extra loads such as operating costs, environmental footprints, etc. Amongst these operations, …
Controlled blasting in a limestone mine using electronic
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. …
Supreme Court shields Chittorgarh Fort from mine blasting
A bench of Justices Sanjiv Khanna and S V N Bhatti ordered: "We declare and hold that notwithstanding any liberal recommendation on undertaking blasting operations nearer to the Chittorgarh Fort ...
Frontiers | Study on Blasting Technology for Open-Pit …
In China, mining blasting vibration has seriously threatened the safety and stability of high and steep rock slopes. In this paper, taking the east mining area of Jianshan Phosphorus Mine as the research background, …
Oversize boulders and toes in large-diameter blasthole bench blasting
The numerical result shows that the average toe height reduces from 0.65 to 0.52 m, and the oversize boulders ratio reduces from 3.1% to 2.7%, as shown in Fig. 16. Finally, a productive test was ...
6.3.1: Bench Blasting | GEOG 000
If you need to convert these to lb/ft 3, multiply by 62.3. If you are using an explosive, x, with a different bulk strength, the factor K B changes as follows: K Bx = K B * (B Sx) 1/2, and B Sx is the bulk strength of explosive X. The other two factors are constants: K …
Effect of Blast Movement Uncertainty on Dig-Limits
This misclassification problem becomes even more evident when ore cannot be distinguished visually from waste during mining operations, such as in most (if not all) gold deposits. During bench blasting, ore and waste blasted rocks are moved by the blast in various directions and distances throughout the blasted section of the bench.
An Evaluation on the Impact of Ore Fragmented by Blasting on Mining
In open-pit mines, the blast operation should be effectively optimized, leading to minimization of production costs through the application of specific technical specifications. However, there is inadequate information in the literature to link blasting to comminution stages. To this end, the effective parameters for the performance of mining …
(PDF) Optimized design of drilling and blasting operations in …
Drilling & blasting is the most essential part of the mining industry that plays a crucial Ore Recovery = Extracted Ore Extracted Ore + Unextracted Ore × 100 role in downstream stages.
Blast plan preparation, including mining operations
The purpose of a blast plan is to: detail the objectives for the project or task. identify risks, hazards and controls. identify site-specific requirements. introduce blasting as part of the overall task. control the blast process from design …
Enabling better blasting
In open-pit mining, the use of blast-masters, by designing the shape and size of the blasting polygons for the whole bench in the initial planning stages, is essential to …
Optimized design of drilling and blasting operations in open pit …
This paper presents an integrated optimization model for both the drilling and blasting operations that consist of all related technical, economic and environmental parameters such as burden, spacing, costs, emissions etc.
Quarrying | Process and Equipment | Applications | Epiroc US
Bench blasting is the most widely used method of production blasting in quarrying, strip mining and construction excavation. This involves drilling inclined, vertical or horizontal blastholes in single- or multiple-row patterns to depths ranging from a few meters to 30 m or more, depending on the desired bench height.
Mining
Mining - Strip, Open-Pit, Quarrying: It has been estimated that more than two-thirds of the world's yearly mineral production is extracted by surface mining. There are several types of surface mining, but the three most common are open-pit mining, strip mining, and quarrying. These differ from one another in the mine geometries created, the techniques …
Assessing and controlling of bench blasting-induced vibrations to
Abstract. Blasting is an important operation in mining production but is a source of concern due to its associated environmental impact; in particular, blasting …
Blasting Fragmentation Study Using 3D Image Analysis of a Hard …
Rock blasting with explosives is the first stage of rock fragmentation and plays a key role in the results of the mining chain. Fragmentation optimization is achieved by considering the energy efficiency of the explosive, the optimal distribution of explosive energy in the rocky mass, and the programmed and controlled release of explosive …
Advanced Analytics for Drilling and Blasting | SpringerLink
Blasting plays a key role in mining operations, and its results can directly affect downstream operations, including crushing and milling. Therefore, predicting a …
Evaluation and optimization of blasting approaches to
A series of bench blasting productive tests were conducted in Heishan coal mine in Xinjiang, China. The rock mass of the quarry is slightly weathered sandstone, the saturation moisture compressive strength is 24–42 MPa, and the natural density is 2.41–2.69 g/cm 3.The blasthole diameter used in the previous blasts is 138 mm, and the …
6.4.2: Patterns for Bench Blasting | GEOG 000
A blasting pattern for a box cut is shown here. Figure 6.4.9: Blasting pattern for a box cut. Sinking blasts like this vary from most blasts because there is no open face for relief and movement must be vertical. Since entire blast is "in the tight," the vibration and fly rock damage potential is high. These patterns can and will be modified ad ...