HR Officer (Fixed Term 6-12 months)

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. It 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 workforce capacity May support multiple teams or sites based on business needs Benefits A safety‑focused and inclusive working environment Advantageous salary package with annual cash incentive awards (STIP) Access to top‑tier family‑friendly health programs including medical, prescription drug, dental, vision, life insurance coverage, and voluntary benefits Excellent retirement plan including up to 6% defined company contribution, generous 401(k) matching program Generous Rio Tinto employee share program, which allows you to purchase Rio Tinto Company shares Comprehensive leave policies covering all moments that matter in life (PTO, paid holidays, 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 well‑being On‑going Employee Assistance Program (EAP) for you and your family to help with educational opportunities, addiction treatment, depression, stress, domestic issues, financial management, and legal concerns Team and industry experts are here to support and work with you to explore your learning potential and career goals Equal Employment Opportunity 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. Rio Tinto participates in E‑Verify to confirm work authorization. Please visit for more information. #J-18808-Ljbffr Rio Tinto