Nigeria is rich is solid mineral resources, such as: Kaolin, gypsum, mica, clay, tantalite, iron ore, gemstone, silica sand.
Read More
Recycling concrete &building rubble is not only able to bring profit to investors, but also good for environment protection.
Read More
By absorbing the advanced technology from the world, we researched and designed PF series impact crusher.…
Read More
Base on the plentiful experience of producing and marketing of impact crusher, Sofol R&D institution…
Read More
Adopting technology from the world, PY Series spring cone crusher has an excellent performance in secondary…
Read More
The vibrating screen is a kind of sieving equipment of international advanced level, developed by our…
Read More
Sofol VSI Series vertical shaft impact crusher is designed by reputed German expert of Sofol and every…
Read More
RESULTS – FIELD WORK AT OPENCAST BAUXITE MINE - A Table – 1 - Details of Trail Blasts Conducted at Bauxite Mines-A. Blast Number Parameter B1 B2 B3 B4 B5 Number of rows - 4 4 5 4 5 Number of holes - 50 45 60 55 48 mm 102 102 102 102 102 Burden m 3.75 3.75 3.75 3.75 3.75 Spacing m 3 3 3 3 3 Drilling Pattern - Staggered - Stemming m …
Details
DGMS vibration standard is statutorily followed for designing controlled blasting patterns and acquiring blasting permission from the authority in opencast mines/quarries. The circular categorises the structure into two types depending upon the ownership. Each category is further classified into three types of structure.
Details
Mining activity plays a major role for economic development of nation.drilling and blasting are two key operations in mining industry.Execution of these rows activities generates two main problems they are ground vibrations, and flyrocks and also some disturbances to the environment like noise pollution,air pollution soil pollution apart from ...
Details
Fan cut is another shot hole pattern used for solid blasting in mining. Solid blasting happens during development. It is for creating split galleries in pillars during de-pillaring operations. Charing of shot holes happens with explosive cartridges charged end-to-end. Indirect initiation happens with wedge cut patterns yielding 10 to 16 MT of ...
Details
Along with fragmentation of the rocks, blasting also produces an excess of energy in the form of heat and vibration. Due to the spread of the vibration, the surrounding …
Details
1. Introduction. Rock fragmentation distribution influences a range of mining and milling processes including load and haul rates, crushing and grinding performance and ore recovery in beneficiation processes (Michaud et al., 1997).In opencast mining, where blasting is employed for excavation, the overall cost effectiveness of the production …
Details
In opencast mining both vertical and inclined holes practiced with the bench face. The holes drilled in a row may be single or multiple. So those two patterns are used, mainly in the opencast mines. They are: a) Single row blasting pattern b) Multi row blasting pattern Single row blasting pattern:
Details
Read this article to learn about the blasting techniques adopted in underground and opencast mines. Blasting Techniques Adopted in Underground Mines: Drilling Patterns in Stone: Drilling patterns, also called shot-hole patterns, are named after the type of cut holes used and the principal patterns are: (1) Pyramid cut or cone cut (2) Wedge cut (3) …
Details
The Jayant project of Northern Coalfields Limited is located in the Singrauli Coalfields of Singrauli district, Madhya Pradesh between latitudes 24 ° 6 ' 45"to 24 ° 11 ' 15" and longitudes 82 ° 36 ' 40" to 82 ° 41 ' 15". The …
Details
This book presents the principles and practices of rock blasting for underground hard rock mining. It covers a theoretical background of the rock blasting technology and comprehensive case studies on different stages of rock blasting for underground metalliferous mining. It includes the discussions on burn-cut face blasting pattern, slot …
Details
The goal of the investigation is to develop a result of optimum blast design through some parameters, as type of explosive, explosive quantity, blast pattern and fragmentation. …
Details
Much of this volume is blasted in the form of benches, a common mining technique (Gustafsson, 1973). Blasting is a part of Large Opencast Coal Mine (LOCCM) operations, and is scheduled based on ...
Details
There are three types of exploder used in Indian mines i.e. Magneto (or Dynamo) Exploder, Battery condenser Exploder and Condenser dynamo Exploder. 3.2.3 Blasting Pattern Followed in Opencast Mines In opencast mines both vertical and inclined holes parallel with bench face is practiced. Row of the holes may be in single or …
Details
The available techniques for drill and blast design in underground mining were analyzed. The advantages and disadvantages of the widely used blast-hole patterns, types of …
Details
Backbreak is an undesirable phenomenon in blasting operations. It can cause instability of mine walls, falling down of machinery, improper fragmentation, reduced efficiency of drilling, etc. The existence of various effective parameters and their unknown relationships are the main reasons for inaccuracy of the empirical models. Presently, the …
Details
As the diagrams and table indicate, the empirical relation defined by Konya [15] and shown below presents the least variance with the blasting patterns used in the main pit of Chadormalu mine: (1) B = 3. 15 D (ρ e / ρ r) 0. 33 where B is the burden (foot), ρ e is the specific gravity of explosive, ρ r is the specific gravity of rock, and D is the …
Details
Conditions for conducting blasting in fire areas in an opencast coal mine (1) Blasting operations shall be carried out under direct supervision of an Assistant manager in charge of Blasting operations. (2) Persons trained in the job of blasting in Fire area only shall be deputed for the said operation. (3) No explosive other than slurry or …
Details
BLAST DESIGN (Figure 8-2) Staggered pattern (Figure 8-3) Sing (Figure 8-1) Square or rectangular pattern. 114 DELAY PATTERNS ... The economic analysis of the use of explosives is an important part of blasting operations in mining and construction. Explosives are energy, and the efficient use of this energy is a major factor in keeping …
Details
The simulations are used to optimise blasting methods in opencast coal mines to improve blasting effectiveness, reduce explosive unit consumption and achieve energy savings and efficiency gains ...
Details
In open-pit mining, blasting pattern design is performed to achieve a desired degree of fragmentation for loading, hauling, and crushing operations. Inappropriate fragmentation of rock will result in numerous problems such as incurring extra costs for secondary blasting, production interruption, etc. Wetness of the blast holes is one of …
Details
Development of pre-split blast designsfor Rampur Agucha Mine of Hindustan Zinc Limited to achieve final stable wall which has made the mine as the deepest opencast mines in India. Designing of drilling and blasting methodology for tunnels, underground powerhouse caverns and open excavation works in more than 20 prestigious hydroelectric ...
Details
Blasting Pattern In Opencast Iron Mines. Drilling and blasting iron ore mine youtube dec 09 2016 crushing plant grinding machine drilling and blasting iron ore mine drilling and blasting in open cast iron mine at sishen pit viper 351 rigs drill read more energy and environmental profile of the morethere safety rules opencast iron mines.
Details
Selection of proper explosive in any blasting round is an important aspect of optimum blast design. Basic parameters include VOD of explosive (m/s), Density (g/cc), Characteristic …
Details
Conditions For Deep-Hole Blasting In Opencast Coal Mine (See Regulation 194 of the Coal Mines Regulations 2017) GENERAL . 1.0 The owner and agent of an opencast mine shall ensure that a prior scientific study is conducted in designing deep hole drilling and blasting system for the mine taking into consideration all mining …
Details
The research is carried out to analyze the cost-effectiveness of blasting patterns with regard to the diameters and design of blasting holes. Blasting patterns for single …
Details
The available techniques for drill and blast design in underground mining were analyzed. The advantages and disadvantages of the widely used blast-hole patterns, types of cuts, and explosives are ...
Details
Drilling and blasting play vital roles in opencast mining. These operations not only affect the cost of production directly but as well and significantly, the overall operational costs. This research was carried out to find a possible way of optimizing the drilling and blasting operations in an open pit mine of Somair (Société des Mines de l ...
Details
The goal of the investigation is to develop a result of optimum blast design through some parameters, as type of explosive, explosive quantity, blast pattern and fragmentation. …
Details
Sublevel stoping is the most popular and practiced mining method in underground hard rock mines. Proper planning and its execution is the key requirement for stope extraction using this method. The stope extraction has been a challenging task since decades. The major reason is the unavailability of free faces as compared to opencast …
Details
The loss of ore to the waste mining stream during blasting or mining. Overburden. Layers of soil and/or rock covering an orebody. Overbreak. Rock breakage outside the designed profile or edge of the blast. P Packaged Explosives. Factory sensitised explosive wrapped in plastic or paper and made in a range of sizes.
Details
While typical blast patterns are square or staggered equilateral, staggered patterns provide a better energy distribution of explosives between boreholes. According to the bench width and minimizing shovel moves, most blasts are drilled four to five rows. Table 11.2 presents typical blasting parameters in open-pit mines .
Details
Sofol is a well-known crusher and grinding mill manufacturer that offers equipment and solutions for customers from aggregates, mining and mineral grinding industry.
You can leave your message here, we'll send you an Email immediately.
Online ChatCopyright ©2000- 2024 Shanghai Sofol CompanySitemap
PE series jaw crusher is usually used as primary crusher in quarry production lines, mineral ore crushing plants and powder making plants.
GET QUOTE