This paper presents the prediction of maximum flyrock distances due to blasting for Kyaukpahto Gold Mine Flyrock is an unwanted throw of rock fragments during bench blasting in mines Flyrock is one of the major undesirable effects of blasting for the surface mines because it is the main cause of fatal accidents and serious injuries
Use bench height plus subdrilling minus stemming 5 From Table 4 of Blaster s Guide determine pounds/foot of explosive 6 Determine total load 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
2 Outline of Topic 6 1 Definition of Open pit Mining Parameters Basic Concept Open pit Mining method Bench Open Pit Bench Terminology Bench height Cutoff grade Open Pit Stability i Pit slope ii Pit wall stability iii Rock strength iv Pit Depth v Pit diameter vi Water Damage vii Strip Ratio SR Open pit mining sequence
A method is proposed for bench blasting in open pit mines that can automatically determine the blastholes positions calculate the explosive charge mass and identifies the initiation sequence in
Bench blasting is commonly employed in hard rock excavations in open pit mines 1 2 3 The effectiveness of bench blasting is influenced by different factors including the rock mass properties blasting parameters and explosive characteristics 4 5 In general the blasting effect is improved by modifying the explosive properties and blasting parameters to align with
The bench height is m The blasting fragmenta paper proposes a cost model considering all activities in mining cycle and system wide approach to minimize the total mining cost of bench
struct the slope the blasting and digging practices for example The local stability of the benches is largely a construction issue; the stability condition is created contemporaneously with the mining as the equipment digs toward the final slope limits use in open pit mining Since slope bench height 1s o e of the
At present drilling equipment with 200 mm hole diameter and above is widely used in large open pit mine The blasthole diameter has significant effect on rock fragmentation since it is the primary blast design parameter and has influence on the choice of burden spacing stemming length etc [1] [2] [3] In order to choose the proper blasthole size for bench
Bench Blasting Here is a sketch of a bench showing a few boreholes and the design variables This bench could be in an underground or surface mine Our goal will be to calculate values for many of the parameters shown on this diagram Here s an interesting chart which is a compilation of the hole diameter and bench height at
Moreover in small open pit gold mines it is feasible to design bench heights up to m since it requires selective mining and the achievement of less dilution Hustrulid and Kuchta 1998 growing bench height Blasting For the explosive material 5 per cent Al added ANFO with a density of kg/dm3 has been proposed assuming that all
The study of the effect of blasting on bench stability is indispensable for the overall mine s safety in this perspective we conducted a study in the limestone quarry which is characterized by
Optimization of Blasting Parameters in open cast mines Download as a PDF or view online for free 23 09 Production Lakh tonne / year 10 Pattern of drilling implemented Square grid 11 Bench height detail Coal 4 &O/B 8 to 14m 12 Drill hole diameter 160mm coal 259mm O/B 13 Burden 6m O/B 5m Coal 14 spacing O/B 5m
In open pit mining the drilling and blasting process is as follows 1 Drilling Holes are drilled with a diameter of 125 mm The depth load is m and the spacing between holes ranges from
34 Controlled Blasting Cushion Blasting • Requires a single row of holes 2 to in in dia • Permits a reduction in the No of holes required by line drilling • Unlike line drilling holes the cushion holes are loaded with light charges • Holes are fully stemmed between charges allowing no air gap 26 and are fired after the production shot has been excavated
In surface mines bench blasting is a typical way of excavating hard rock mass Although a significant development has taken place in explosive technology but still only a part of the energy is
struct the slope the blasting and digging practices for example The local stability of the benches is largely a construction issue; the stability condition is created contemporaneously with the mining as the equipment digs toward the final slope limits use in open pit mining Since slope bench height 1s o e of the
Rules of thumb are ubiquitous in blasting Typically presented as ratios they assist with the initial assumptions of blast design and provide guidance for best practice Examples include the blast hole diameter as a function of bench height and stemming length as a function of hole diameter The most common rules of thumb were developed in mid 20th
The above relation was selected for designing and optimizing the blasting pattern In the used and designed pattern for the southern mass of iron ore mine and according to the Konya [15] empirical relation the values of burden and spacing are respectively m and m and the ratio of burden to spacing is The results of using this blasting pattern show that
Download Table Blasting pattern specifications of limestone mines from publication A comparative study on the application of various artificial neural networks to simultaneous prediction of
Increasing demand for power supply in the country has put pressure on producing more coal at a faster rate A tandem dragline system has become popular in recent times and is used to remove overburden from opencast coal mines The amount of overburden removal and coal production are directly proportional Overburden removal typically makes up
the production bench Table 1 In large mines in China the bench height is usually12 ment of the equipment bench height develops towards high bench or superhigh bench Bench slope is the slope between upper and lower bench berms The bench slope angle is the included angle between the bench slope and hor
