Reverse Circulation, Rotary & Grade Control Services
Mineral Exploration Drilling
Accurate, timely sample data drives confident exploration decisions. O’Keefe Drilling provides reverse circulation, rotary, grade control, and supporting mineral exploration drilling services across Montana and the western United States. Our crews, equipment, and in-house machine shop are configured to deliver reliable samples, consistent performance, and efficient cost per meter in demanding field conditions.
Share site access, depth targets, and sample requirements to receive a scoped proposal.
EXPLORATION OPERATIONS
The Operational Realities of Exploration Drilling
Exploration programs depend on representative samples, predictable drilling performance, and tight operational control. Delays, contamination, or equipment downtime directly impact decision timelines and capital allocation.
Common operational challenges include:
- Remote sites with limited infrastructure
- Variable formations requiring adaptive tooling
- Sample contamination risks affecting assay accuracy
- Equipment downtime increasing cost per meter
- Environmental and regulatory compliance requirements
Successful exploration drilling requires preparation, adaptability, and disciplined sample management.
OPERATIONAL ADVANTAGES
Why O’Keefe for Mineral Exploration
The difference between a productive exploration program and a stalled one often comes down to equipment reliability, field adaptability, and sample integrity.
O’Keefe Drilling is structured to support exploration teams with:
- Five specialized reverse circulation rigs, including truck and buggy configurations
- Dual-wall RC systems with modern sample splitting technologies
- In-house machine shop for rapid tool fabrication and field modifications
- Experienced crews trained for remote logistics and safe site operations
When subsurface conditions change, we do not pause operations to wait for outside adjustments. We fabricate, modify, and adapt in the field to keep drilling programs moving. This level of operational control helps reduce downtime, protect sample quality, and improve overall drilling efficiency.
Exploration Drilling Capabilities
Reverse Circulation (RC) Drilling
Reverse circulation drilling is the preferred method for rapid, representative chip sampling during mineral exploration and grade control programs.
RC drilling provides:
- High-volume sample recovery
- Faster penetration rates compared to many core methods
- Lower overall cost per meter
- Reliable chip samples for assay and evaluation
Our RC rigs are adapted to our specifications and equipped with advanced sample splitting systems designed to maintain representative samples and reduce contamination risk. This supports more accurate geological interpretation and informed exploration decisions.
Rotary & Percussion Drilling
For deeper targets or formations not suited to RC drilling, we deploy rotary and percussion hammer systems engineered to maintain borehole stability and consistent penetration in variable geology.
These methods are selected based on formation characteristics, target depth, and program objectives to ensure operational efficiency.
Grade Control Drilling
We support active mining and production environments with precise grade control drilling. Accurate, consistent sample delivery helps mine planners make short-term operational decisions with confidence.
Our rigs and splitting systems are configured to meet program-specific sampling requirements while maintaining efficiency in production environments.
Borehole Directional Surveys & Spot Coring
We provide:
- Gyroscopic borehole directional surveys
- Magnetic directional surveys
- Targeted spot coring services
These services support subsurface modeling, geological interpretation, and structural analysis without interrupting broader drilling programs.
Mineral Exploration
Equipment & Technology
Our fleet and systems are configured to maintain quality and efficiency in exploration environments:
- Five reverse circulation rigs (truck and buggy)
- Dual-wall RC systems
- Modern sample splitting and cyclone systems
- Percussion hammer systems
- Gyroscopic and magnetic survey tools
- On-site machine shop for custom tooling and rapid modifications
Maintaining in-house fabrication capabilities allows us to control critical adjustments without relying on external vendors, reducing delays and protecting drilling schedules.
WHO WE SUPPORT
Who This Service Is Designed For
Our mineral exploration drilling services support:
- Mining companies
- Exploration firms
- Geologists and project managers
- Engineering consultants
- Production and grade control teams
Whether supporting early-stage target testing or advanced production drilling, our team integrates with existing programs to maintain reliability and performance.
Supported exploration and drilling
Selected Exploration Clients
We have supported exploration and production drilling programs for:
- Barrick Golden Sunlight Mine
- Montana Resources
- Montana Tunnels
- Rio Tinto
- Newmont Gold
- BHP Copper
- Coeur Rochester
- Midway Gold Exploration
These long-standing relationships reflect consistent field execution and dependable drilling performance.
Frequently Asked Questions
What is reverse circulation drilling best used for?
Reverse circulation drilling is ideal for rapid, representative chip sampling in mineral exploration and grade control programs. It provides reliable assay material at lower cost per meter compared to many core methods.
How do you ensure sample integrity?
We utilize dual-wall RC systems, dedicated sample splitting equipment, and consistent chain-of-custody procedures. Our in-house machine shop enables rapid tooling adjustments when required to maintain representative sampling.
Do you provide borehole directional surveys?
Yes. We provide both gyroscopic and magnetic directional surveys to support accurate subsurface modeling and geological evaluation.
Can you operate in remote locations?
Yes. Our crews are experienced in remote site logistics and field operations across Montana and the western United States.
How early should we involve O’Keefe in our program?
Early involvement improves planning efficiency. Discussing depth targets, access conditions, and sample requirements in advance allows us to align equipment and resources appropriately.
O'Keefe Drilling
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Request a quote
Planning an Exploration Program?
If you are evaluating or planning a mineral exploration drilling program, we are prepared to review your scope and provide a detailed bid.
Provide site access information, depth targets, and anticipated timelines to begin the proposal process.