In the open-pit mining projects, harmful gases, rock dust and fumes are difficult to disperse due to poor ventilation in the bottom area of the pit. Therefore, the open-pit mine sites contain a lot of acid harmful gases and dust in the air.

DTH drilling rigs produced by JK Drilling are equipped with an enclosed cabin with an air conditioner to secure operators' safety and comfort and large windows offer operators a wide view.

The borehole diameter for the coal industry usually ranges from 150 to 200 mm. Adopting a specialized feeding system, the rigs are suitable for coal applications as they deliver stable drilling effect and high drilling efficiency.