As the leader in Test, Development and Validation of vehicles, from 2 to 18 wheels, Technical Professionals Group is the resource that automotive, truck, motorcycle, agricultural, construction and component manufacturers have come to know as the supplier of choice. Whether on your proving ground, at your engineering center or R&D facility, or one of our strategically located test centers, the team at Technical Professionals Group has proven itself consistently over the years to be the ideal partner for quality, timely and accurate results.

We offer a broad range of workforce management and managed program solutions for vehicle testing, quality assurance, and quality control programs at all development stages from R&D through product engineering to the production process and for pre and post-launch.

Industry: Motor Vehicle Manufacturing
Company Size: 201-500 employees

Technical Professionals Group

Savvy Admin PROD

TPG is seeking an enthusiastic Mine Geologist to be part of a dedicated team focused on supporting copper production at a world class copper deposit. The Mine Geologist plays a critical role in supporting safe and efficient ore extraction by providing accurate geological interpretation, ore boundary definition, and field validation at an autonomous haulage, high-tonnage open-pit copper mine, which processes both sulfide and oxide ores. Reporting to the Chief Mine Geologist, this position ensures that ore control decisions are informed by field observations and geological data, and that ore routing supports both Mine-to-Mill optimization and LSXEW leach material performance. The Mine Geologist is instrumental in linking and integrating geology with operations, planning, and metallurgy to drive site-wide value generation.

**Key Responsibilities**

- Conduct detailed pit mapping, geologic logging, and sampling with focus on lithology, structure, alteration, and mineralization, ensuring accurate material classification.

- Define and update ore control polygons and ore/waste boundaries, ensuring sulfide and oxide ore are routed appropriately to mill, leach pad, or stockpiles.

- Support Mine-to-Mill initiatives by identifying rock characteristics that impact fragmentation, handling, and plant throughput, and communicating findings to Drill & Blast and Processing teams.

- Collaborate with the LSXEW and Metallurgy teams to optimize heap leach material selection, ensuring appropriate copper solubility, acid consumption, and mineralogy compatibility.

- Contribute geological insight to shovel placement and short-range production plans to minimize dilution and maximize recovery.

- Assist in the update of 3D operational geology models in Leapfrog Geo, under direction of the Chief Geologist, ensuring current pit conditions are reflected in planning inputs.

- Participate in grade reconciliation processes, comparing predicted vs. actual performance, identifying causes of discrepancies, and refining geological interpretations.

- Perform QA/QC of sampling procedures including blast hole logging, channel sampling, and data integrity reviews.

- Coordinate closely with Survey, Mine Engineering, and Operations to ensure geological guidance is actionable and aligned with the short-range mining schedule.

- Report findings and provide visualizations in daily/weekly production meetings and planning reviews.

- Ensure geological work and documentation adhere to international best practices, including conformity with U.S. SEC SK-1300 technical reporting standards as applicable.

- Ensure compliance with site HSE standards and promote safe fieldwork practices.

Requirements

**Qualifications**

- Bachelor's degree in Geology, Geological Engineering, or a related discipline

- 2+ years of open pit mine geology experience, preferably in porphyry copper systems

- Working knowledge of ore control methods and field validation for both mill-grade and leach-grade material

- Familiarity with Mine-to-Mill concepts, including fragmentation analysis and geometallurgical impacts

- Understanding of heap leach behavior, including copper solubility, oxide/sulfide transitions, and acid consumption trends

- Proficiency in geologic software (Leapfrog Geo, MinePlan, Vulcan, or similar)

- Strong observational skills and ability to work closely with cross-functional teams in field and office settings

- Effective communication and technical documentation skills

- Valid driver's license

~~**The mine site is located 64 miles southeast of Phoenix and 70 miles northeast of Tucson. We have a robust carpool / vanpool program and encourage employees to participate. Employees save more than 50% of their commuting costs while reading, sleeping or just enjoying the view.This position offers an excellent low-cost benefits package for medical/prescription/ dental/vision, disability coverage, life insurance and other optional coverage, and 401(k) plan with company match.** ~~~~**IND123 ** ~~

Mine Geologist

The Senior Mine Geologist serves as the primary technical authority for geological interpretation, grade control modeling, and ore characterization at a high-tonnage (~120,000 stpd) open-pit copper mine operating dual process circuits (sulfide concentrator and oxide LSXEW). Reporting to the Chief Geologist, this role bridges field geology execution and strategic resource management, providing direct technical oversight of mine geologists and technicians while owning key deliverables including block model updates, drill program execution, grade reconciliation analysis, and geometallurgical data integration. The Senior Mine Geologist ensures that geological outputs are accurate, timely, and actionable for mine planning and metallurgical optimization.

Duties and Responsibilities

Ore Control and Grade Control Modeling

- Own the development and maintenance of a grade control model, integrating pit mapping, blast hole assays, on a rolling basis to support short-range 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, solubility characteristics, and deleterious element thresholds.

- Define and maintain material type classifications with clear decision criteria aligned to metallurgical recovery expectations for both concentrator and LSXEW circuits.

Geological Interpretation and Field Work

- Conduct and oversee detailed pit face mapping, geologic logging, and sampling programs with rigorous documentation of lithology, alteration , structure, and mineralization

- Maintain and update the 3D geological model including lithological domains, structural interpretations, alteration zoning, and mineralization envelopes, ensuring the model reflects current pit conditions and new data inputs.

- Interpret geological data in the context of deposit scale to improve predictive accuracy of grade and material type distributions.

- Identify and communicate geological risk or opportunity stakeholders in advance of mining.

Grade Reconciliation and Data Analysis

- Lead detailed grade reconciliation (F1-F3) comparing resource model predictions to grade control model outputs, plant head grades, and metallurgical recoveries across both concentrator and LSXEW circuits.

- Identify root causes of reconciliation variances (geological, sampling, modeling, or operational) and develop corrective actions to improve predictive accuracy.

- Maintain reconciliation databases and produce regular variance analysis reports for review by the Chief Geologist and site leadership.

- Support resource estimation activities by providing validated geological interpretations, domain wireframes, and valid database.

Geometallurgical Integration

- Collaborate with Metallurgy, Process Engineering, and LSXEW teams to characterize ore variability and its impact on plant performance, including hardness, flotation response, acid consumption, and copper solubility.

- Support Mine to Mill initiatives by identifying and communicating rock mass characteristics that influence fragmentation, handling, and throughput to Drill and Blast and Processing teams.

- Contribute to the development and maintenance of geometallurgical models linking geological attributes (mineralogy, alteration, oxidation) to processing outcomes.

- Ensure ore routing decisions are supported by adequate characterization data including sequential copper analysis, mineralogical spot checks, and metallurgical test work results.

Technical Compliance and Reporting

- 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 and change documentation.

- 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.

Team Development, Safety, and Collaboration

- Provide day-to-day technical mentorship and supervision of mine geologists and geological technicians, including training on mapping standards, logging protocols, modeling workflows, and QA/QC procedures.

- Serve as acting lead for the geology team during the Chief Geologist's absence.

- Participate in and contribute to daily, weekly, and monthly production and planning meetings, presenting geological findings and recommendations.

- Promote and adhere to all site health, safety, and environmental standards, ensuring geological

Requirements Required

- Bachelor's degree in Geology, Geological Engineering, or closely related discipline.

- Minimum 5 years of progressive experience in open pit mine geology, with demonstrated competence in grade control, geological modeling, and reconciliation at copper operations.

- Proficiency in Leapfrog Geo, Hexagon MinePlan (or equivalent) for building and maintaining operational geology models.

- Working knowledge of complementary mine planning and data management software such as MinePlan, Vulcan, acQuire, or Hexagon, and GIS.

- Solid understanding of porphyry copper deposit geology, including supergene enrichment, oxide/sulfide transitions, and alteration.

- Working knowledge of both sulfide flotation and oxide heap leach processing fundamentals as they relate to ore characterization and routing.

- Experience implementing and maintaining QA/QC programs for blast hole, RC, and core drilling sample streams.

- Effective written and verbal communication skills, including the ability to produce clear technical documentation and present geological findings to multidisciplinary audiences.

- Valid Arizona driver's license required for site and pit access.

- Willingness to work on a mine site schedule including field rotations and occasional extended hours.

~~**The mine site is located 64 miles southeast of Phoenix and 70 miles northeast of Tucson. We have a robust carpool / vanpool program and encourage employees to participate. Employees save more than 50% of their commuting costs while reading, sleeping or just enjoying the view.This position offers an excellent low-cost benefits package for medical/prescription/ dental/vision, disability coverage, life insurance and other optional coverage, and 401(k) plan with company match.** ~~~~**IND123 ** ~~

Senior Geologist

Find your dream job with Savvy AI Recruiter. Browse thousands of opportunities from top companies. Our AI-powered system matches you with roles that fit your skills and experience.