Plant Operator

Martin Marietta; Corona (CA); On-site; USD 48,000 - 55,000; Full time

Benefits offered by this job

Medical

Dental

Vision

401(k) matching

Pension

Holidays & Vacation

Tuition Assistance

Job summary

Martin Marietta is seeking a Plant Operator to run and monitor crushers, screens, belts, and loaders while maintaining safety and efficiency on the production floor.

You will perform routine inspections, execute preventive maintenance, and keep accurate production and inventory records. The role requires reliable teamwork and a solid safety mindset in outdoor, variable conditions.

Qualifications

• High school diploma or equivalent; some plant ops experience preferred.
• Mechanical and technical aptitude required for equipment operation and maintenance.
• MSHA compliance and strong safety awareness are essential.

Responsibilities

• Start, monitor, and regulate crushers, screens, conveyors, feeders, and pumps per safety standards.
• Adjust process settings to optimize material flow and quality per job specs.
• Operate mobile equipment such as skid steers and front-end loaders.
• Conduct pre-shift inspections and document daily reports accurately.
• Perform preventive maintenance: greasing, cleaning, belt changes, and bearing/pulley work.
• Identify malfunctions, shut down equipment safely, and request repairs.
• Maintain clean, organized work areas and ensure environmental and dust controls.
• Communicate with supervisors and teammates to maintain efficient workflow.
• Assist in training new staff on equipment operation and safety procedures.
• Maintain daily production and inventory reports.

Skills

Mechanical aptitude

Technical aptitude

Plant components knowledge

Critical thinking

Time management

MSHA compliance

Effective communicator

Education

High School Diploma, GED, or equivalent

Job description

Description

As a Plant Operator at Martinand 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 including but not limited to—observing visual and auditory signals during operation, performing routine daily inspections of plant and mobile equipment, reporting defects to the supervisor, as well as maintaining and managing inventory levels of various wear items used throughout the plant site. You will be instrumental in achieving production goals by ensuring consistent, quality aggregate output and maintaining a clean, secure work environment.

Key Duties And 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.

Qualifications

Education

High School Diploma, GED, or equivalent work experience

Work Experience

No prior experience is required; 6 months – 1 year of experience in Aggregate Plant Operations or similar Heavy Building Materials industry, preferred.

Knowledge, Skills, And Abilities

• Mechanical aptitude
• Technical aptitude
• Knowledgeable of plant components
• Critical thinking
• Time management
• MSHA compliance and regulations
• Effective communicator (written and spoken)

Additional Details

Physical Requirements

Must be able to lift and carry up to 50 lbs. for plant maintenance and equipment servicing.

Required to bend, stoop, climb, and reach. You must be able to maintain three points of contact when climbing on/off machinery or on ladders.

Strong hand-eye-foot coordination is essential for operating hand/foot controls. You must have good depth perception with or without seeing aid for distances up to 150 feet.

Working Conditions

All duties require outside assignments and require periods of work in all weather conditions, cold, wet, dry and dusty.and Must be able to work in areas where noise levels are up to 85 dbs.

Disclaimers

In addition to the primary responsibilities outlined, the successful candidate may be expected to take on other tasks and assignments as required, including but not limited to duties outside the typical scope of the role to support overall team operations and organizational needs. Flexibility and adaptability to evolving job demands are essential.

The hiring range for this position is $35 -$40 exclusive of benefits or bonuses (discretionary and non-discretionary). The offered base compensation will be determined based on factors such as geographic location, business need, market conditions, proficiencies, skills, education, and experience. Additionally, at Martin Marietta we place a high value on internal pay equity and will consider the compensation for those in similarly situated roles and direct team members. The hiring range for this role represents the base compensation we expect to pay for the position at time of hire and does not represent the total possible base pay of the position.

In addition to our base compensation, we also offer a competitive benefits package for full-time employees, including medical, dental and vision coverage; prescription drug coverage; health savings accounts; flexible spending accounts; life, AD&D and disability insurance; 401(k) with a company match and an employer-funded defined benefit pension plan. Other benefits include paid time off, paid holidays, education/tuition assistance, an employee discount program, adoption assistance, wellness programs and more.

Part time employees are eligible to participate in the 401k plan and receive a company match. In addition, they are eligible to start accruing service for the pension plan.

A member of the S&P 500 Index, Martin Marietta is an American-based company and a leading supplier of heavy building materials – including aggregates, cement, ready-mixed concrete and asphalt. Through a network of operations spanning 28 states, Canada and the Bahamas, dedicated Martin Marietta teams supply the foundational resources upon which our communities thrive. Martin Marietta's Magnesia Specialties business produces high-purity magnesia and dolomitic lime products used worldwide in environmental, industrial, agricultural and specialty applications.

At Martin Marietta, we strive to work with the best and the brightest – those who have the potential to become our company's future leaders. Each of our roughly 9,500 people shares a common purpose regardless of their professional role or work environment. Together, we utilize our diverse skills and experiences to drive our company and its extraordinary culture forward. Our aim is to build on our foundation of success and help values-driven and hardworking people realize their full potential. When you decide to invest your career in Martin Marietta, you'll know what it's like to be respected, challenged and rewarded.

In return, we offer a highly competitive benefits package, including:

• Medical
• Prescription Drug
• Dental
• Vision
• Health Care Reimbursement Account
• Dependent Care Reimbursement Account
• Wellness Programs
• Employee Assistance Plan
• Paid Holidays and Vacation
• 401(k) with Company matching
• Pension
• Salary Continuation – Short-Term Disability
• Long-Term Disability Options
• Employee Life Insurance
• Spouse & Dependent Life Insurance
• Business Travel Accident Insurance
• Direct Deposit Payroll
• Educational/Tuition Assistance Plan
• College Scholarship Program – for dependent children
• Matching Gift Program
• New Auto Purchase Discount Plans

At Martin Marietta, we are proud to be an Equal Opportunity Employer. We are committed to providing an environment of mutual respect where equal employment opportunities are available to all qualified applicants and teammates. We celebrate diversity and commit that qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.