HR Officer (Fixed Term 6-12 months)

About the role About Rio Tinto Respect and inclusion About the role HR Officer (Fixed Term

• 6-12 Months) Join our global leading business offering outstanding personal development & global career opportunities Permanent employment which includes a huge range of additional benefits A company with a world class reputation for safety and performance Excellent opportunity to develop your career
• Boron, California For California based roles the expected annual salary range is $ 79,520
• $109,340 About the role Finding better ways to provide the materials the world needs.

We are seeking a detail-oriented HR Officer to support HR operations with a strong focus on employee transactions, compliance, and HR administration. This role plays a critical part in ensuring accurate processing of employee data, legal requests, and workforce changes, while also supporting employees and leaders with day-to-day HR needs. This is a hands-on role in a fast-paced operational environment supporting both union and non-union populations. HR Transactions & Employee Data Management (CORE FOCUS) Process employee lifecycle transactions in HR systems (hires, transfers, promotions, separations) Support and administer internal job bids and movement processes in alignment with policy/CBA Maintain accurate and timely employee data changes in Workday/SAP Ensure all employee records are complete, compliant, and audit-ready Manage position and org structure updates as needed Payroll-Related Compliance & Requests Process and manage wage garnishments, levies, and income withholding orders HR Officer (Fixed Term

• 6-12 Months) Join our global leading business offering outstanding personal development & global career opportunities Permanent employment which includes a huge range of additional benefits A company with a world class reputation for safety and performance Excellent opportunity to develop your career
• Boron, California For California based roles the expected annual salary range is $ 79,520
• $109,340 About the role Finding better ways to provide the materials the world needs.

We are seeking a detail-oriented HR Officer to support HR operations with a strong focus on employee transactions, compliance, and HR administration. This role plays a critical part in ensuring accurate processing of employee data, legal requests, and workforce changes, while also supporting employees and leaders with day-to-day HR needs. This is a hands-on role in a fast-paced operational environment supporting both union and non-union populations. HR Transactions & Employee Data Management (CORE FOCUS) Process employee lifecycle transactions in HR systems (hires, transfers, promotions, separations) Support and administer internal job bids and movement processes in alignment with policy/CBA Maintain accurate and timely employee data changes in Workday/SAP Ensure all employee records are complete, compliant, and audit-ready Manage position and org structure updates as needed Payroll-Related Compliance & Requests Process and manage wage garnishments, levies, and income withholding orders Respond to and coordinate subpoenas and employment-related legal requests Partner with Payroll and Legal to ensure timely and compliant handling of sensitive requests Maintain strict confidentiality and documentation standards Timekeeping & Payroll Support Act as an HR liaison for timekeeping-related questions, partnering closely with the Timekeeper and Payroll teams Support review and validation of timekeeping data as needed (e.g., discrepancies impacting HR processes, leave, or employee status changes) Assist in resolving employee inquiries related to pay, time corrections, and payroll adjustments in coordination with the Timekeeper Ensure alignment between HR records (e.g., employee movements, leave status) and timekeeping/payroll systems

Note:

Primary ownership of daily time entry and processing remains with the Timekeeper role. Employee & Labor Support Respond to employee inquiries (policies, pay, status changes, documentation) Support documentation for employee relations and investigations Assist with grievance administration and tracking (union environment) Reporting, Tracking & Compliance Maintain logs and trackers for: Employee movements Leave cases Garnishments and legal requests Investigations and accommodations Support audits and ensure compliance with company policies and California requirements Stakeholder Support Serve as a key point of contact for HR-related administrative and operational questions Partner with HR, Payroll, Benefits, and leaders to ensure seamless execution of processes What You'll Bring Required Qualifications 2-5 years of HR experience in a transactional or operations-heavy role Experience processing employee data changes in HR systems (Workday, SAP, etc.) Hands-on experience with: Employee movements/job changes Payroll-related processes or coordination High-volume administrative work with accuracy Ability to manage multiple priorities with strong follow-through High attention to detail with strong organizational and case-tracking skills Preferred Qualifications

• Experience processing garnishments, subpoenas, or legal HR requests
• Experience supporting union environments (job bids, movement rules)
• Familiarity with Kronos timekeeping
• Knowledge of California employment requirements Key Skills
• High accuracy and data integrity focus
• Strong organization and tracking discipline
• Ability to handle sensitive and confidential matters professionally
• Practical, solutions-oriented mindset
• Strong responsiveness and customer service mindset Additional Information This role requires regular on-site presence in Boron, CA Fixed-term role supporting operational continuity and workload capacity May support multiple teams or sites based on business needs What we offer We are committed to providing our employees with a generous benefits package.

Be recognized for your contribution, your thinking, your hard work, and go home knowing you've helped the world progress, we provide: A safety-focused and inclusive working environment Advantageous salary package with annual cash incentive awards (STIP) for eligible employees Access to top-tier family-friendly health programs including medical, prescription drug, dental, vision, life insurance coverage, and various voluntary benefits. Excellent retirement plan including up to 6% defined company contribution; Generous 401k matching program Generous Rio Tinto employee share program, which allows you to purchase Rio Tinto Company shares. Comprehensive leave policies which cover all moments that matter in life: PTO (paid time off), paid holidays, and paid bereavement leave. A favorable child-caregiver leave program (Up to 100% salary top-up) Discount programs for leisure purposes and access to Virgin Pulse with incentives supporting your wellbeing Ongoing Employee Assistance Program (EAP) for you and your family; to help in addressing educational opportunities, addiction treatment, depression, stress, domestic issues, financial management, and legal concerns. Our team and industry experts are here to support and work with you to explore your learning potential and career goals About Rio Tinto Rio Tinto is a leading global mining and materials company. We operate in 35 countries where we produce iron ore, copper, aluminium, critical minerals, and other materials needed for the global energy transition and for people, communities, and nations to thrive. We have been mining for almost 150 years and operate with knowledge built up across generations and continents. Our purpose is finding better ways to provide the materials the world needs

• striving for innovation and continuous improvement to produce materials with low emissions and to the right environmental, social and governance standards.

But we can't do it on our own, so we're focused on creating partnerships to solve problems, create win-win and meet opportunities. Where you will be working Rio Tinto Borates is a global leader in industrial mineral supply and science. We supply approximately 25% of the world's demand for refined borates, minerals essential to life and modern living. We seek to create mutual value by working closely with our investment partners and host communities. Our 20 Mule Team Borax brand pays tribute to our first borates mining operation in Death Valley in 1872. About Rio Tinto Rio Tinto is a leading global mining and materials company. We operate in 35 countries where we produce iron ore, copper, aluminium, critical minerals, and other materials needed for the global energy transition and for people, communities, and nations to thrive. We have been mining for 150 years and operate with knowledge built up across generations and continents. Our purpose is finding better ways to provide the materials the world needs

• striving for innovation and continuous improvement to produce materials with low emissions and to the right environmental, social and governance standards.

But we can't do it on our own, so we're focused on creating partnerships to solve problems, create win-win situations and meet opportunities. Respect and Inclusion Rio Tinto is committed to equal employment opportunity. All qualified applicants will be considered without regard to race, color, sex, age, religion, national origin, disability, or any other characteristic protected by federal, state, or local law. We are committed to an inclusive environment where people feel safe, respected and valued. We want our people to feel that all voices are heard and that a variety of perspectives are not only welcome but are essential to our success. We treat all our people fairly and with dignity. Rio Tinto participates in E

• Verify to confirm work authorization.

Please visit http:

//www.ucis.gov/ for more information. R57942 Read More About Rio Tinto Rio Tinto is a leading global mining and materials company. We operate in 35 countries where we produce iron ore, copper, aluminum, critical minerals, and other materials needed for the global energy transition and for people, communities, and nations to thrive. We have been mining for 150 years and operate with knowledge built up across generations and continents. Our purpose is finding better ways to provide the materials the world needs—striving for innovation and continuous improvement to produce materials with low emissions and to the right environmental, social and governance standards. But we can't do it on our own, so we're focused on creating partnerships to solve problems, create win-win and meet opportunities. Respect and inclusion Rio Tinto is committed to equal employment opportunity. All qualified applicants will be considered without regard to race, color, sex, age, religion, national origin, disability, or any other characteristic protected by federal, state, or local law. We are committed to an inclusive environment where people feel safe, respected and valued. We want our people to feel that all voices are heard and that a variety of perspectives are not only welcome but are essential to our success. We treat all our people fairly and with dignity. Rio Tinto participates in E

• Verify to confirm work authorization.

Please visit http:

//www.ucis.gov/ for more information.