Geologic Technician / Core Cutter

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.