Underground mining demands equipment that doesn’t just perform — it has to perform consistently, even under the harshest conditions. Whether you’re working in narrow stopes, drilling vertically upward into the roof, or sinking holes in confined spaces, the type of rock drill you choose can make or break your productivity on the job. At GME Drills, we’ve built our reputation on delivering exactly that kind of reliable, high-performance equipment to miners across North and South America.

The G250 Rock Drill Series is one of our flagship product lines, offering three purpose-built configurations: the G250 – Jackleg Drill, the GT250 – Stoper Drill, and the GS250 – Sinker Rock Drill. Each drill is engineered for a specific underground drilling application, giving mining teams the flexibility to deploy the right tool for the right job — every single time.

In this blog, we’ll walk you through what makes each configuration unique, the benefits they bring to the worksite, and how they compare to industry-standard alternatives.

G250 – Jackleg Drill: Precision Drilling in Confined Spaces

When it comes to drilling in tight, confined underground spaces, the G250 – Jackleg Drill is the go-to choice for experienced miners across the continent. Also known as “perforadora jackleg” in Spanish-speaking mining regions, this drill is the direct equivalent of the widely recognized S250 Jackleg Drill — and it’s built to meet every standard that reputation demands.

What sets the G250 Jackleg Drill apart is its ability to drill at challenging orientations while maintaining a high penetration rate and strong torque output, even at low air pressure. This is a critical advantage in environments where compressed air supply may be limited or inconsistent. Operators can trust this machine to deliver results without requiring optimal conditions every time.

Key Features of the G250 Jackleg Drill:

• High penetration rate and strong torque even at low air pressure
• Pusher leg controls integrated into the drill backhead for maximum safety and operator comfort
• Large contact areas between major cylinder components to reduce impact pressure and extend product life
• Available in feed lengths of 51″, 39″, and 30″ via the GP755A Pusher Leg
• Push button jackleg retraction for faster, easier operation
• Parts fully interchangeable with the Boart Longyear A755 Pusher Leg
• Available in sinker, stoper, and jackleg configurations
• Market leader across North and South America
• Motorcycle control feed for intuitive handling

The GP755A Pusher Leg that pairs with the G250 Jackleg Drill is specially designed to complement the drill’s balanced weight distribution, making it easier for operators to maintain control during long drilling shifts. The fact that its parts are interchangeable with the Boart Longyear S250 Jackleg Drill also means lower procurement costs and easier sourcing of replacement components.

GT250 – Stoper Drill: Built for Upward Vertical Drilling

Drilling vertically upward presents its own set of challenges — gravity is working against you, operator fatigue sets in faster, and maintaining consistent torque in an overhead position is no small task. That’s precisely the application the GT250 – Stoper Drill was designed to conquer.

The GT250 Stoper Drill, also referred to as “Perforadora Stoper” in Spanish, is the equivalent of the Boart Longyear S250 Stoper Drill. Like its counterpart in the series, it has always been the top choice for miners who demand high performance, exceptional control, and long-lasting reliability — but specifically in upward-drilling applications.

The stoper leg design incorporates a push button to retract the stoper leg, reducing physical strain on the operator. Combined with an adjustable motorcycle feed, operators have precise control over the drill’s movement, even when working overhead. The large contact areas between major cylinder components are engineered to reduce impact pressure and significantly increase the drill’s operational lifespan.

Key Features of the GT250 Stoper Drill:

• High penetration rate and strong torque even at low air pressure
• Ergonomic stoper leg controls for reduced operator fatigue
• Push button stoper leg retraction for convenience and speed
• Adjustable motorcycle control feed for precise handling
• Large contact areas to minimize impact pressure and increase service life
• Minimum downtime and low maintenance costs
• Parts interchangeable with Boart Longyear S250 stoper drill
• Available in sinker, stoper, and jackleg configurations

For mining operations that require consistent overhead drilling — whether in raise development, longhole stoping, or crown pillar work — the GT250 Stoper Drill delivers the kind of dependable, repeatable performance that helps crews hit their production targets shift after shift.

GS250 – Sinker Rock Drill: Smarter, Quieter, Harder Working

The GS250 – Sinker Rock Drill takes the trusted industry-standard GS250 platform and elevates it significantly through the integration of advanced noise suppression technology. This isn’t just about making the work environment more comfortable — it’s about fundamentally changing how energy is transferred during the drilling process.

By redirecting more energy directly into the rock face rather than absorbing it through the driller’s body, the GS250 Sinker Rock Drill reduces physical strain while simultaneously increasing drilling efficiency. Independent testing has validated these claims: the GS250 not only lowers noise levels on-site, but also increases torque and penetration rates compared to standard sinker drills. The result is higher production with significantly less stress on the operator’s ears, hands, and feet.

Key Benefits of the GS250 Sinker Rock Drill:

• Channels more energy into the rock face, minimizing operator body impact
• Effectively reduces noise while simultaneously enhancing torque and penetration rates
• Improves production rates with significantly less fatigue for drillers
• Lower rebuild costs compared to standard sinker drills, ensuring longer operational life
• Parts are fully interchangeable with the Boart Longyear S250 jackhammer

For mining companies facing pressure to reduce occupational health risks and comply with workplace noise regulations, the GS250 Sinker Rock Drill is a smart investment. Longer drill life, reduced maintenance downtime, and healthier operators make for a more productive and sustainable mining operation overall.

Why Choose GME Drills for Your Underground Rock Drilling Needs?

At gmedrills.com, we don’t just sell equipment — we partner with mining operations to ensure they have the right tools to succeed. The G250 Rock Drill Series represents the best of what we offer: proven performance, interoperability with industry-standard parts, and ergonomic design that looks after your operators as much as your output.

All three drills in the series — the G250 Jackleg Drill, GT250 Stoper Drill, and GS250 Sinker Rock Drill — share a commitment to low maintenance cost, minimal downtime, and maximum productivity. And because their parts are interchangeable with well-known Boart Longyear equivalents, transitioning to GME equipment or maintaining a mixed fleet is seamless and cost-effective.

Whether you’re outfitting a new mine or upgrading an existing fleet, the G250 series gives you three configurations purpose-built for underground mining — each one backed by GME’s commitment to quality, performance, and long-term reliability.

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