ASARCO LLC is seeking a Senior Mine Geologist to act as the central technical authority for geological interpretation, grade control, and ore characterization at a high-tonnage, ~120,000 stpd open-pit copper mine with dual processing circuits. Reporting to the Chief Geologist, you will bridge field geology execution and strategic resource management, providing technical oversight and owning key deliverables from block model updates to geometallurgical integration.

What You'll Do

Own the development and maintenance of the grade control model, integrating pit mapping and blast hole assays to support short- and medium-range mine plans.
Generate and validate dig polygons and ore/waste boundaries for both sulfide mill feed and oxide leach material, ensuring correct routing based on copper grade, mineralization type, and other key criteria.
Define and maintain material type classifications aligned with metallurgical recovery expectations for both concentrator and LSXEW circuits.
Conduct and oversee detailed pit face mapping, geologic logging, and sampling programs with rigorous documentation.
Maintain and update the 3D geological model, ensuring it reflects current pit conditions and new data inputs.
Interpret geological data at the deposit scale to improve predictive accuracy of grade and material type distributions.
Identify and communicate geological risks or opportunities to stakeholders in advance of mining.
Lead detailed grade reconciliation (F1-F3) comparing resource model predictions to grade control outputs, plant head grades, and metallurgical recoveries across both processing circuits.
Identify root causes of reconciliation variances and develop corrective actions to improve predictive accuracy.
Maintain reconciliation databases and produce regular variance analysis reports for review by site leadership.
Support resource estimation activities by providing validated geological interpretations, domain wireframes, and a clean database.
Collaborate with Metallurgy, Process Engineering, and LSXEW teams to characterize ore variability and its impact on plant performance.
Support Mine to Mill initiatives by communicating rock mass characteristics that influence fragmentation, handling, and throughput.
Contribute to the development and maintenance of geometallurgical models linking geological attributes to processing outcomes.
Ensure ore routing decisions are supported by adequate characterization data, including sequential copper analysis and metallurgical test results.
Ensure all geological data, models, and documentation conform to U.S. SEC SK-1300 technical reporting requirements and international best practices.
Maintain organized, auditable geological databases and model archives with version control.
Prepare technical memoranda, geological summaries, and supporting documentation for resource updates, mine plan reviews, and regulatory submissions.
Provide geological inputs for slope stability assessments, waste characterization programs, and environmental permitting as required.
Provide day-to-day technical mentorship and supervision of mine geologists and geological technicians, including training on standards and QA/QC procedures.
Serve as acting lead for the geology team during the Chief Geologist's absence.
Participate in daily, weekly, and monthly production and planning meetings, presenting geological findings and recommendations.
Promote and adhere to all site health, safety, and environmental standards.