Plant Operator

Martin Marietta•Corona, CA

11d•$35 - $40•Onsite

About The Position

As a Plant Operator at Martin Marietta, you will play a pivotal role in supporting our mining and aggregate production operations. Working under the direction of the Plant Manager and Supervisor, you'll be responsible for safely and efficiently operating, monitoring, and maintaining plant processing equipment. Tasks include observing visual and auditory signals during operation, performing routine daily inspections of plant and mobile equipment, reporting defects to the supervisor, and maintaining inventory levels of wear items. You will be instrumental in achieving production goals by ensuring consistent, quality aggregate output and maintaining a clean, secure work environment.

Requirements

High School Diploma, GED, or equivalent work experience
Mechanical aptitude
Technical aptitude
Knowledgeable of plant components
Critical thinking
Time management
MSHA compliance and regulations
Effective communicator (written and spoken)

Nice To Haves

6 months – 1 year of experience in Aggregate Plant Operations or similar Heavy Building Materials industry, preferred.

Responsibilities

Start, monitor, and regulate crushers, screens, conveyors, feeders, and pumps in compliance with safety standards.
Adjust process settings to ensure optimal material flow and quality in line with job specifications.
Operate mobile equipment such as skid steers and front-end loaders during load out or clean-up tasks.
Conduct pre-shift and ongoing inspections of plant and mobile equipment, document daily reports accurately.
Perform preventative maintenance tasks like greasing, cleaning, screen changes, belt splicing, and bearing or pulley replacements.
Identify malfunctions or blockages, safely shut down equipment during emergencies, and initiate work requests for repairs.
Maintain a tidy work area—clear spillage, dust, and debris around equipment and haul roads.
Adhere to all MSHA and company safety policies, including proper PPE use.
Communicate effectively with supervisors and teammates to ensure efficient workflow and safety compliance.
Assist in training new or temporary staff on equipment operation and safety procedures.
Take on additional duties—cleaning, quality control, rail loading—as assigned by management.
Maintain daily production reports, recording activity levels, downtime, and material inventory.
Ensure compliance with environmental regulations regarding batch plant operations and dust control.