What Drilling Techniques Are Used For Coal Mines?

Coal is extracted from the earth’s crust using mining drilling bits, which are vital equipment. The purpose of these specialist drill bits is to reach the coal seams, which contain valuable coal resources, by breaking through different strata of rock and sediment. For coal mining operations to be both safe and productive overall, these drill bits’ effectiveness and efficiency are vital.

Wear-resistant accessories, tool holders, cutting tools, and wear solutions are all offered by JYF Machinery for both open-pit and underground mining. Cutting picks, mining drill bits, and mining tooth holders are examples of mining cutting tools. Other mining drill equipment is also included in this category. For example, underground mining tools, rock drill bits, HDD drill bits, and drill bits for mining.

Methods of Drilling

Purposes in mining, allow geologists access to a variety of soil samples for examination to facilitate the collection of important minerals that would be otherwise impossible to reach. There are various methods of mining, which will give you the whole concept of mining. These methods are as follows:

1. Auger Drilling

The most basic type of drilling is auger drilling. It takes two people to manually rotate a helical screw into the ground, though small cars can also be used to attach auger drills. The screw blade raises the earth once the auger drill has drilled down far enough. This type of drill is designed to be used as an initial geochemical reconnaissance method in softer soils in order to determine the best location for a larger drill to be mounted.

2. Rotary Air Blasting Drilling

The method most frequently used for shallow drilling is rotary air blasting, in which a hammer-like device driven by a piston forces the drill bit into the rock, breaking up the hard surface into chips that are subsequently blasted to the surface with compressed air. Given that the rock quality may be compromised during the air blasting process, this method works best for drilling a large number of holes quickly but is less suitable for producing geological samples.

3. Air core Drilling

Using a hollow drill rod and three blades, air-core drilling is a technique used to break through loose rock and dirt. Compressed air is shot through the drill rod to force the cuttings to the surface once the drilling is finished. This technique is more accurate than rotary air blasting; therefore, the samples are less likely to be contaminated, even though it is usually slower.

4. Reverse Circulation Drilling

Reverse circulation is a widely used mining exploration technique that is comparable to air core drilling and rotary air blasting. The drill bit is forced into the rock using the same piston-powered hammer, but reverse circulation drilling’s larger rigs and equipment enable the drill bit to be driven considerably deeper into the ground.

The broken earth is then propelled to the surface using compressed air. This process generates samples free of contaminants and requires less treatment, which lowers costs and speeds up turnaround times, making it perfect for geological investigation.

5. Diamond Core Drilling

The most costly drilling technique is called diamond core drilling, which entails extracting a continuous rock cylinder from many kilometers below the surface of the ground using a drill bit reinforced with industrial diamonds fastened to hollow drill rods.

But this technique also yields the most precise rock samples since it may bring a mineral’s complete core to the surface instead of just its shards, which is perfect for obtaining data on the mineral’s strength, composition, porosity, etc.

6. Blast Hole Drilling

Drilling techniques such as blast whole drilling are used to remove substantial portions of the earth’s surface and facilitate access to the minerals beneath. It entails boring holes into the ground. After that, explosive charges are inserted into each hole and set off.

If the drilling and blasting were done underground, the explosion-created tunnels would be strengthened to permit safe human entrance when the damaged material was swept away. Gas pressure blasting pyrotechnics are an alternative to explosives for moving the rock in preparation for excavation.

Sum Up

During the extraction process, mining drilling bits are specialized instruments used to drill holes in nearby rock formations or coal seams. They are essential to guaranteeing effective coal extraction while upholding safety regulations. In order to guarantee safe and effective drilling operations in coal mining, proper maintenance and routine inspection are crucial.