Human Resources Manager

MP Materials; Mountain Pass (CA); On-site; USD 110,000 - 150,000; Full time

Job summary

MP Materials in Mountain Pass, CA seeks a Manager of Human Resources to shape and execute the people strategy across sites. You will lead talent acquisition, employee relations, performance management, and HR compliance, partnering with senior leadership to drive workforce effectiveness and ensure an engaging, compliant workplace culture.

The role requires a Bachelor’s degree and at least five years of HR leadership experience, with strong knowledge of U.S.

Qualifications

• Minimum 5 years of HR management experience.
• Strong knowledge of U.S. labor laws and HR best practices.
• Excellent communication and interpersonal skills.
• Experience managing recruitment, employee relations, and performance management processes.
• Experience with HRIS systems and data analytics tools (e.g., ADP).

Responsibilities

• Lead recruitment, onboarding, training, performance evaluation, and employee development.
• Develop and update HR policies to ensure compliance with federal, state, and local laws.
• Advising management on HR-related matters including conflict resolution and workforce planning.
• Drive engagement initiatives and DEI programs to foster an inclusive culture.
• Analyze HR metrics and prepare leadership reports for improvement opportunities.
• Oversee employee relations and timely handling of workplace issues and grievances.
• Coordinate with external vendors and legal counsel to support HR operations.

Skills

Communication

Interpersonal skills

Recruitment

Employee relations

Performance management

HR analytics

Education

Bachelor’s degree in HR or related field

Tools

ADP

HRIS

Job description

Company Overview

MP Materials (NYSE: MP) is rebuilding American industrial capability for a new era of autonomy, robotics, and electrification. We are the only U.S. company with a fully integrated rare earth supply chain—from mining and refining to advanced metal and magnet manufacturing. Our products include both the critical materials used to make permanent magnets and the finished magnets themselves—enabling next-generation technologies in robotics, automation, aerospace, transportation, defense, and energy systems. These materials are the foundation of physical AI - the convergence of computation, movement, and control.

We hire ambitious, mission-driven people who want to tackle complex challenges and shape the future of strategic industries. Our culture is rooted in teamwork, resiliency, and integrity, with a deep commitment to operational excellence and national purpose. MP is rapidly evolving from a materials producer into a leading U.S. manufacturer—and our people are driving that transformation.

Position Overview

The Manager of Human Resources plays a pivotal role in shaping and executing the human capital strategy to support the organization's overall business objectives at the Mountain Pass, California location. This position is responsible for overseeing numerous HR functions, including talent acquisition, employee relations, performance management, and compliance with labor laws across all sites. The Manager will collaborate closely with senior leadership to align HR initiatives with organizational goals and drive continuous improvement in workforce effectiveness. This role ensures that the company attracts, develops, and retains top talent while maintaining a compliant and supportive workplace culture.

Position Responsibilities

• Lead and manage the full spectrum of human resources activities including recruitment, onboarding, training, performance evaluation, and employee development.
• Develop, implement, and update HR policies and procedures to ensure compliance with federal, state, and local employment laws and regulations.
• Serve as a trusted advisor to management and employees on HR-related matters, including conflict resolution, disciplinary actions, and workforce planning.
• Drive employee engagement initiatives and diversity, equity, and inclusion programs to cultivate a positive and inclusive workplace culture.
• Analyze HR metrics and prepare reports to inform leadership decisions and identify opportunities for organizational improvement.
• Oversee employee relations and ensure timely and effective resolution of workplace issues and grievances.
• Coordinate with external vendors and legal counsel as necessary to support HR operations and compliance.

Basic Qualifications

• Bachelor’s degree in Human Resources, Business Administration, or a related field.
• At least 5 years of progressive experience in human resources management or a similar role.
• Strong knowledge of U.S. labor laws and HR best practices
• Excellent communication and interpersonal skills with the ability to build relationships at all organizational levels.
• Experience managing employee relations, recruitment, and performance management processes.
• Experience with HRIS systems and data analytics tools, e.g. ADP.

Desired Qualities

• Master’s degree in Human Resources Management, Organizational Development, or related discipline.
• Professional HR certification such as SHRM-CP or PHR/SPHR.
• Experience working in a multi-state environment with diverse workforce populations.
• Demonstrated success in leading diversity, equity, and inclusion initiatives.

MP Materials is Proud to be an Equal Opportunity / Aff

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, protected veteran status, or any other characteristic protected by law. Underrepresented groups/Women/Disabled/Veterans are encouraged to apply. Candidates whose disabilities make them unable to meet the position’s requirements will still be considered qualified if they can perform the essential functions of the job with reasonable accommodation.

Your Right to Work – In compliance with federal law, all persons hired will be required to verify identity and eligibility to work in the United States and to complete the required employment verification document form upon hire.

Safety Provision - Employees are responsible for following all company, industry and regulatory procedures and laws to ensure a safe work environment for themselves and the company. Employees must have a willingness to promote safety among the workforce, participate in Process Hazard Analysis procedures and Pre-Startup Safety Reviews.

(PPE) Personal Protective Equipment is required when performing work in a mine, manufacturing, outdoor, or plant environment. Required PPE may include, but is not limited to, hard hat, hearing protection, safety glasses, safety footwear, respirator, rubber steel-toe boots, protective clothing, gloves, and any other protective equipment as required.

Working Conditions - Our facility sits at an elevation of 4,700 feet. Employees may be subject to extreme weather conditions when working in an outdoor setting (heat and cold, wind). Work is at an open pit mine or manufacturing/chemical plant setting, which may include exposure to moving mechanical parts, toxic chemicals, risk of electrical shock, explosives, fumes, or airborne particles.

Physical Demands - Manual dexterity; sense of touch; sense of smell; speaking clearly; hearing-speech range; hearing – all ranges; seeing, reading and comprehensions; seeing – distant/near; depth perception; color vision. While performing the job responsibilities, the employee is required to talk and hear. The employee is often required to stand and use their hands and fingers, to handle or feel and to manipulate laboratory equipment. The employee is occasionally required to walk, reach with arms and hands, climb or balance, and to stoop, kneel, crouch or crawl. Vision abilities required by this job include close vision. Employees must pass a full-face respiratory fit test. Employees must be able to lift 50 lbs. Must be able to work in PPE level C. These requirements are representative, but not all-inclusive, of the knowledge, skill, and ability required of the employee.