In metal mines and underground engineering projects, the construction of small-diameter raises and shafts — ore passes, fill holes, ventilation raises, and utility boreholes — has long been a bottleneck that holds back entire project schedules. Conventional drill-and-blast methods force workers into the shaft itself, which is slow, labor-intensive, and fraught with safety risks. Conventional raise borers, on the other hand, are large, bulky machines that demand an upper access tunnel and a concrete foundation, making them difficult to deploy in narrow underground workings. The Box Hole Boring Machine (BBM) was developed precisely to solve this industry-wide problem. Operating directly from a lower-level excavation, it drills small-diameter raises upward in a single pass — no upper tunnel required — and is now redefining how small-section shaft construction is carried out, becoming an essential piece of equipment for modern mines around the world.
The Box Hole Boring Machine is an upward-boring system evolved from proven pipe-jacking technology, and it can be seen as the “light cavalry” of the raise-boring family. Unlike a conventional raise borer, which first drills a pilot hole downward and then reams back up, the Box Hole Boring Machine works directly from an underground chamber, boring upward in a single continuous operation. This eliminates the need for upper-level development work and a host of auxiliary preparation tasks. The machine features a compact, modular design, typically cutting diameters between 0.67 and 1.27 meters and reaching depths of up to 90 meters. It can be rapidly deployed and easily relocated within narrow mining tunnels, making it a highly mobile drilling platform that goes wherever it is needed.
The working cycle of a Box Hole Boring Machine can be summarized in four stages: anchoring, thrusting, rotary cutting, and muck removal. Before drilling begins, the machine secures itself to the rock wall of the lower chamber using hydraulic support systems, creating a stable reaction base. The rotary drive then spins the cutter head at high speed to break the rock at the face, while hydraulic thrust cylinders provide continuous axial feed force, pushing the cutter upward along the designed inclination. Rock cuttings are carried out of the bore continuously by a screw conveyor or a high-pressure water flushing system. The entire process is highly automated — operators simply monitor drilling parameters from a safe remote location while the machine completes raises of up to one hundred meters or more.
The Box Hole Boring Machine stands apart from other drilling equipment thanks to a combination of distinctive advantages:
In terms of function, the Box Hole Boring Machine covers nearly every small-diameter shaft requirement in modern mining. It drills ore passes and draw-point holes to support ore handling and transportation systems. It constructs paste-fill tube holes, enabling the smooth implementation of backfill mining methods. It opens utility boreholes for compressed air, water, and power lines, simplifying underground infrastructure installation. It is also widely used for ventilation raises, blast slot holes, and emergency rescue boreholes — truly a “multitasker” for both production and safety operations. Today, this equipment is used extensively across metal mines, coal mines, hydropower projects, and railway tunneling. It is especially common in narrow-vein gold mines in Australia, South Africa, and other mining-intensive regions, and is rapidly gaining adoption in the Chinese market.
Compared with drill-and-blast techniques, the Box Hole Boring Machine eliminates the need for personnel to enter the shaft, removing collapse and fall hazards at their source while simultaneously improving both safety and final borehole quality. Compared with conventional raise borers, it removes the need for upper-level development and concrete foundations, lowering the investment threshold and offering far greater mobility — making it particularly well suited to shallow-buried projects and confined underground chambers.
As the mining industry moves toward greater automation and intelligence, the Box Hole Boring Machine is being integrated with cutting-edge technologies such as remote control, attitude self-sensing, and intelligent anti-jamming systems. It continues to evolve toward higher efficiency, greater safety, and smarter operation. There is little doubt that this “underground light cavalry” will become an indispensable core asset in the green mines and intrinsically safe mines of the future, injecting lasting momentum into global underground resource development.
