A borer is a machine used to create holes between two mine levels for transportation or ventilation. Raised drilling is safer and more productive than traditional blasting techniques. A reamer is used to create the hole, and pad drilling offers controlled drilling and smooth walls without the need for reinforcement.
A borer is a machine used to create holes, or holes, between two existing levels of a mine. These holes are often referred to as pads and are generally used for transportation or ventilation purposes. The borer can be used to create uplifts or vertical holes along a slope or angle. Compared to traditional blasting techniques, raised drilling offers several advantages in terms of mining safety and productivity.
In a standard drilling application where a hole is drilled between two levels in a mine, the hoist drill will be positioned on the higher of the two levels. Using a hydraulic motor, the machine first drills a pilot hole from the upper level to the lower level. A drilling unit known as a reamer is positioned below this pilot hole at the lower level and connected to the lift drill by a series of cables. Using hydraulic pressure, the raised edge lifts the reamer to create a hole between the two levels, cutting through dirt and rock.
Sometimes, the higher of the two tiers may be too small to accommodate the borer. A special boxhole boring machine is used in this application. The hole is placed at the lower level and used to drill a pilot hole up to the upper level. The reamer is connected to the lifting reamer with hydraulic pistons and the reamer pushes the reamer from the bottom to the upper level. While this device provides an effective method for drilling in smaller mines, it also poses an additional risk to miners and equipment operators.
Pad drilling serves as an alternative to traditional blasting, which relies on explosives to create pads and bores. While blasting tends to be unpredictable, increasing bore allows for controlled drilling. The location of the reamer protects operators from falling rocks or debris and there is no risk of fire or fumes such as those associated with explosions. Finally, elevated drilling allows for the creation of safe and effective wells in areas where the ground is too unstable for explosives.
In addition to its many safety benefits, lift boring also offers many other benefits to miners and mining companies. The hole walls created by a raised drill are smooth and consistent, and in most cases there is no need to add reinforcement or structural support. Reaming also allows you to create raises much faster than sandblasting. By using different types of reamers, hole size and shape are virtually unlimited, allowing for flexibility in mine design and operation.
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