Blast Hole Drilling

At Master Drilling the rigs used for blast hole drilling are set up specifically for the use of high benches in open cast mines. The drilling pattern depends completely on the client’s needs and parameters. The diameter of the blast hole is the most important aspect to consider. The size of the blasthole diameter can determine the long term outcome of the mining project. The type of rock, the fragmentation of the rock and the type of work that needs to be done all play important roles in the blasthole drilling project. When working with large scale operations the diameter of 400mm is the best option while when working on a small scale the diameter of 30mm is the best choice.

Blasthole drilling is most commonly used in the exploration of minerals. Blast hole drilling is done by the use of explosives. The rock is blasted and crushing and removing of the rock and other materials helps to determine what type of materials and ore is within the earth. Charging cavities are created and explosives are placed into these cavities. Thus a blasthole is not the after effect of an explosion, instead it is the hole created in which the explosives, as well as the various components that go along with the detonation of the explosives, are placed. This is why the diameter of such a hole is kept small as the objective is not to create a crater but instead the objective is to create a way in which to begin the exploratory mining process.

The drilling part of the blast hole drilling process is that most expensive part of the project. This is because it is the most important part of the project. If the initial drilling is done wrong then the future of the project could end up being a problem. Factoring in a number of considerations such as the size and the depth of the project are all part of the success of the blast hole drilling and future drilling projects.

Other than the selection of the hole and the selection of the diameter there are a number of other factors that need to be considered before a blasthole drilling project is undertaken:

Required production: the amount of product to be removed from the drilled hole needs to be taken into account. If only a moderate amount is going to be removed then the diameter of the hole does not need to be huge.
Surrounding terrain: it is important to keep in mind that the machinery that will need to be used to extract the ore and other materials needs to be placed on a stable piece of land that will be able to accommodate the weight of the machinery as well as the stress that will be placed on the machinery when it is working.
Characteristics of the material to be mined: this concerns the ability to successfully drill the materials which you need to drill through. If the rock is too hard to drill through then it will place stress on the machinery used to drill. The characteristics of the material will also determine the size of the hole.
The type and size of the excavating equipment to be used: The size of the machinery to be used does not have to be as big as possible. The equipment needs to be suitable for the project but it does not have to be incredibly heavy. The size of the blast hole does not and should not be decided based on the type and size of the excavating equipment.
Distance to the vibration of the explosives: The bigger the blast hole, the more explosives will be used and this will increase the amount of vibration which could lead the blast hole to collapse, this is however the worst case scenario but it is a very important factor to take into consideration.
Bench height: if a bench height has already been set then this will need to be kept in mind.
Type and size of the explosives: Most explosives work better when used in larger blast holes and when buying explosives in bulk there is usually a cost advantage.

Master Drilling offers blast hole drilling solutions worldwide with preference to the following countries: Peru, Chili, Brazil, Colombia, Ecuador, Argentina, Bolivia, Guatemala, United States of America, Canada, Mexico, Honduras, Nicaragua, China, India, Vietnam, Indonesia, Philippines, Russia, Kazakhstan, Australia, Papua New Guinea, Ghana, Zambia, Mozambique, Namibia, Botswana, Tanzania, DRC, Mali, Burkina Faso, Saudi Arabia, Zimbabwe, Kenia, Namibia , South Africa, Ireland, Poland, Finland, Sweden, Norwegian, Portugal, Italy, Bulgaria, Turkey and Malta.

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