About the role
Position Summary
Based at our facility in Mariposa, California the Geologic Technician / Core Cutter supports the Exploration and Geology teams by safely processing diamond drill core and assisting with geological data. This position is responsible for core cutting, sampling, labeling, and maintaining a safe, organized core facility.
The role requires a strong commitment to safety, attention to detail, and the ability to work in a physically demanding mining and exploration environment.
Key Responsibilities
Core Processing & Sampling • Cut diamond drill core using core saws in accordance with geologist instructions and sampling protocols • Label, bag, and prepare samples for shipment following chain-of-custody and QA/QC requirements • Maintain sample integrity and accurate documentation • Photograph core and assist with core layout, orientation, and archiving • Ensure proper handling, storage, and security of drill core
Geological Support • Assist geologists with core handling, logging preparation, and sample selection • Record basic geological measurements and observations as directed • Support QA/QC programs including blanks, standards, and duplicates • Assist with core recovery tracking and reconciliation of samples
Health, Safety & Environmental Compliance • Work in compliance with Cal/OSHA, MSHA (where applicable), and site-specific safety requirements • Perform pre-operational inspections of core saws and equipment • Maintain a clean, organized, and hazard-free core shack or facility • Use required PPE at all times (eye protection, hearing protection, gloves, steel-toe boots, etc.) • Immediately report hazards, near misses, and incidents
General Duties • Perform routine cleaning and maintenance of core saws and related equipment • Assist with inventory management of sampling supplies and consumables • Support other exploration or geology-related tasks as assigned • Work collaboratively with geologists, drillers, and contractors
Required Qualifications • High school diploma or equivalent • Valid driver's license • Familiarity with diamond drill core handling and sampling procedures • Ability to safely perform physical work, including lifting and moving core boxes • Strong attention to detail and ability to follow written and verbal instructions • Basic computer skills for data entry and sample tracking
Preferred Qualifications • Post-secondary education in Geology, Earth Sciences, or a related field • Experience as a core cutter, geologic technician, or exploration laborer • Cal/OSHA/MSHA safety training, First Aid/CPR • Experience with geological databases, logging software, or core photography systems
Work Environment • Work will occur in a core facility but may require field work or travel to an underground mine site. • Exposure to water, dust, noise, vibration, and varying temperatures • Shift work, weekends, or rotational schedules may be required
Physical Requirements • Ability to lift up to 50 lbs • Ability to stand, bend, kneel, and perform repetitive tasks for extended periods • Ability to work safely around industrial equipment
Compensation
The pay range for this position will be $20.00 - 25.00 per hour, depending on qualifications and experience. This position is non-exempt and eligible for overtime.
Equal Employment Opportunity
Keystone Mines Inc. is an Equal Opportunity Employer and complies with all applicable California employment laws. We are committed to maintaining a safe, inclusive, and respectful workplace.
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