What are the responsibilities and job description for the Diamond/Core Driller Assistant position at Mariana Minerals?
About Mariana Minerals
Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Our culture is built on three principles:
Extreme Ownership – We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate – We simplify, optimize, and then automate for scale.
Share Your Legos – We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply.
Summary
The Diamond/Core Driller Assistant supports drilling operations by assisting the Lead Driller with equipment setup, operation, maintenance, and site activities. This role requires physical endurance, attention to safety, and the ability to work in remote outdoor environments. The assistant plays a key role in ensuring efficient and safe core drilling operations.
Responsibilities
Assist with setup, operation, and teardown of diamond/core drilling rigs
Handle drill rods, tooling, and core barrels during drilling operations
Retrieve, label, and store core samples accurately
Mix and manage drilling fluids and maintain circulation systems
Perform routine maintenance and basic repairs on drilling equipment
Keep the worksite clean, organized, and hazard-free
Load and unload equipment, supplies, and materials
Follow all safety procedures and environmental regulations
Support site preparation tasks such as clearing and leveling drill locations
Communicate effectively with the Lead Driller and crew
Qualifications
High school diploma or GED preferred
Previous experience in drilling, construction, mining, or similar field is a plus
Ability to perform physically demanding labor (lifting 50 lbs)
Basic mechanical aptitude and familiarity with hand/power tools
Strong commitment to safety and attention to detail
Willingness to work long hours in outdoor and remote conditions
Valid driver’s license preferred (CDL a plus)
Safety certifications (First Aid/CPR, OSHA/MSHA, H2S) are advantageous
Attention to detail
Why Join Us?
At Mariana Minerals, you’ll be part of a mission-driven team reshaping the way critical minerals are sourced and supplied globally. You’ll have the autonomy to make big decisions, the tools to innovate, and a culture that values ownership, smart automation, and collaboration.
Mariana is an Equal Opportunity Employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. We do not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status, or any other protected status.