About Coal mine rock drill operating procedures
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6 FAQs about [Coal mine rock drill operating procedures]
Why is drilling important in coal mining?
For coal deposits, like most other minerals, drilling is a key to identifying in detail the grade and size of the resource, both prior to mine development, and during operations. Mining operations employ a variety of drilling methods based on the requirements of the project.
How deep should a coal mine be drilled?
From the chart, the range will be 4.5 to 12.3 inches depending on site conditions. A coal mine may encounter problems if it attempts to use the same diameter drill to blast overburden that is significantly deeper than the parting layer. Fragmentation in the parting layer will be compromised, and flyrock may occur if blast holes are overloaded.
How does a drill rig collect information about a potential coal resource?
Coring (diamond drilling) is another way of collecting information about a potential coal resource. The drill rig is equipped with a hollow tube, and as the drill pushes the rods into the ground, a cylindrical piece of the rock is pushed into the hollow tube. These samples are usually the length of a drill rod, which is 6 meters.
How do mining operations work?
Mining operations employ a variety of drilling methods based on the requirements of the project. In the majority of cases, a drilling program will begin with the exploration phase. The aim is to to confirm survey data about the location and extent of the coal deposits or seams.
What are the different types of drilling methods?
There are two basic drilling methods—percussion and rotary—classified in accordance with the way in which mechanical energy transfers from the rig to the rock. Percussion Drilling In percussion drilling, the rock is made to fail by means of a piston that delivers rapid impacts to the drill steel, thereby transferring energy to the drill bit.
What are the requirements for bolting and drilling operations?
Bolting and drilling operations should be carried out in accordance with the mines strata management plan and support rules. (iv) an operator protection system which provides an appropriate level of protection. Note: The OHS Regulation 2001 requires risks to be reduced to the lowest lever reasonable practicable in a hierarchical order, refer 2.1.3.