blast pressure in limestone mining

Optimization of blasting design in open pit limestone ...

2020-6-2 · The quarry is having vertical blast holes with 76 mm diameter in all the benches. The average depth of blast holes are 13.5 m in length with a 1 m sub-drilling and 3.5 m of stemming. Ammonium nitrate and Fuel Oil (ANFO) and emulsion explosive were used in blasting operations to blast the limestone.

MEASUREMENT AND EVALUATION OF BLASTING …

2014-9-5 · ground motions resulting from the blast, and the movement of rock at the bench face. Audible air blast is called noise while air blasts at frequencies below 20 Hz and inaudible to the human ear are called concussions. This is measured and reported as an "overpressure" it means air pressure over and above atmospheric pressure.

Designing Blast Patterns Using Empirical Formulas

2014-4-2 · Designing Blast Patterns Using Empirical Formulas A Comparison of Calculated Patterns With Plans Used in Quarrying Limestone and Dolomite, With Geologic Considerations By Joseph M. Pugliese Twin Cities Mining Research Center, Minneapolis, Minn . . US Department of Interior Office of Surface Mining Reclamation and Enforcement Kenneth K. Eltschlager

Controlled blasting in a limestone mine using electronic ...

Request PDF | Controlled blasting in a limestone mine using electronic detonators: A case study | Except for very deep-seated deposits, open cast mining method has been recognized as …

Controlled blasting in a limestone mine using electronic ...

2017-1-25 · 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 blasting techniques …

1) Effects of blast pressure on the human body

2010-7-9 · (1977) and Sartori (1983), summarizes the effects of increasing blast pressure on various structures and the human body. This data originates from weapons tests and blast studies to assess the effect of blast overpressure on structures and people. This data provides some guidance on the possible effects of mine explosions on miners.

Prediction of Blast-induced Air Over-pressure in Open-Pit ...

2019-2-1 · Air over-pressure (AOp) is one of the products of blasting operations for rock fragmentation in open-pit mines. It can cause structural vibration, smash glass doors, adversely affect the surrounding environment, and even be fatal to humans. To assess its dangerous effects, seven artificial intelligence (AI) methods for predicting specific blast-induced AOp have …

Collaborative blast optimisation in a limestone mine

2021-9-4 · Boral''s Limestone Mine near Marulan in southern New South Wales is the source of limestone for up to 60 per cent of all cement products used in the state. It has operated since the 1830s, and today it is Boral''s largest mining operation in Australia. The mine blasts 3.5 million tonnes of rock a year using modern open-cut hard rock drill and ...

CONDUCTING THE CONTROLLED MASS BLASTING ON …

2013-11-26 · 2 MINING PARAMETERS ON THE LIMESTONE MINE BREZA Major mining project of the limestone exploitation defines drill-mining parame-ters as follows: - blast hole drilling diameter (Ø) -76 mm, - floor height h = 10 m'' optimal foot-print of blast stone 600 mm, - the least resistance line (N) 2.7 m, the distance between the wells in row (a) 3.5 m,

CDC

 · Mine workers may be killed or injured by rock thrown by a blast. The blaster who designs a blast determines how far rock from the blast is expected to go. Based on this determination the blaster will designate the blast area, which is the area that must be evacuated before a blast…

Impact analysis of pressure-relief blasting on roadway ...

2021-4-1 · The depth of the blasthole is mainly determined by the position of the pressure-relief zone in blasting. From formula, the blast hole depth of pressure-relief blasting can be calculated as follows: (13) L = (2) i-1-1 r 0 where: r 0 is the radius of the roadway, which is 2.1 m herein.

CDC

 · Mine workers may be killed or injured by rock thrown by a blast. The blaster who designs a blast determines how far rock from the blast is expected to go. Based on this determination the blaster will designate the blast area, which …