What does blasting mean in mining?
Drilling and blasting is the controlled use of explosives and other methods such as gas pressure blasting pyrotechnics, to break rock for excavation. It is practiced most often in mining, quarrying and civil engineering such as dam, tunnel or road construction. The result of rock blasting is often known as a rock cut.
How is blasting done in mines?
blasting, process of reducing a solid body, such as rock, to fragments by using an explosive. Conventional blasting operations include (1) drilling holes, (2) placing a charge and detonator in each hole, (3) detonating the charge, and (4) clearing away the broken material.
What is used for blasting in mines?
More than 90% of the domestic explosive and blasting agent formulations generally used are ammonium nitrate (AN) based (USGS, 2000). A mixture of ammonium nitrate and fuel oil, commonly known as ANFO, gained acceptance for blasting at surface mines.
Are explosives used in open pit mining?
Surface mines in the coal and metal/nonmetal sectors rely extensively on explosives to uncover mineral deposits. A mixture of ammonium nitrate and fuel oil, commonly known as ANFO, gained acceptance for blasting at surface mines.
How drilling and blasting is done?
Drill and Blast Method
- Drilling blast holes and loading them with explosives.
- Detonating the blast, followed by ventilation to remove blast fumes.
- Removal of the blasted rock (mucking).
- Scaling crown and walls to remove loosened pieces of rock.
- Installing initial ground support.
What is blasting technology?
Blasting technology is an essential part of the construction process to perform structural engineering activities. Blasting is the process of cracking rock material by using a small amount of explosive substance so that the rock is destroyed into several pieces.
Why is blasting necessary in mining?
Question: Why is Blasting necessary? Answer: In any kind of construction, quarrying or mining operation, blasting is generally considered the quickest and least costly method of removing rock. If explosives could not be used, many projects would become unreasonably expensive and would simply not be built.
How many types of blasting are there in mining?
The six controlled blasting techniques that will be discussed are (1) line drilling, (2) trim blasting, (3) buffer blasting, (4) smooth wall blasting, (5) air decking, and (6) presplitting. There are a number of uncommonly used controlled blasting techniques. These techniques work efficiently in specific situations.
What is Shortwall mining?
The shortwall mining technique is similar to longwall mining but with shorter face lengths, ranging between 40 and 90 m, with the aim of controlling the caving nature of the overlying upper strata, the load on support and the overall operation of the supports applied at the face.
What does underground mining mine?
Australia’s large and diverse local underground mining industry produces a significant proportion of its coal, gold, nickel, copper, zinc, lead, tin, uranium and diamond exports.
Is dynamite used in coal mines?
People living near quarries and coal mines often express concern about “the dynamiting going on over there.” In fact, dynamite, a nitroglycerin-based explosive, is rarely used today in Ohio’s quarries and surface coal mines. The most widely used explosives are ANFO, emulsions, and ANFO/emulsion blends.