Sr. Estimator

About Mariana Minerals

Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.

Role Overview

Mariana Minerals is seeking an experienced and detail-oriented Sr. Estimator to lead cost estimation efforts for mining and mineral processing projects. This role is responsible for developing accurate, competitive, and timely cost estimates that support strategic decision-making and project success.

What You’ll Do

• Lead the preparation of detailed cost estimates for mining, processing, and infrastructure projects
• Analyze drawings, specifications, proposals, and other documentation to prepare time, cost, materials, and labor estimate
• Utilize RSMeans data and tools to develop accurate and benchmarked cost estimates
• Collaborate with engineering, procurement, and project management teams to ensure accurate and comprehensive estimate
• Develop and maintain cost databases, benchmarks, and estimating tools
• Identify project risks and opportunities, providing mitigation strategies
• Review and validate subcontractor and supplier quotes
• Participate in bid reviews, value engineering, and project planning sessions
• Provide ongoing cost analysis and support throughout the project lifecycle
• Mentor junior estimators and contribute to continuous improvement initiatives
• Support the PCM and Software Engineering teams in developing operating systems and tools to automate estimating processes

What You’ll Bring

-

7+ years of experience in estimating within mining, heavy industrial, or construction environments

• Strong knowledge of mining operations, materials, and equipment
• Proficiency in RSMeans
• Advanced skills in Excel and data analysis
• Ability to interpret technical drawings and specifications

- Strong analytical, organizational, and communication skills

• Availability to travel 20% of the time to site or Mariana Minerals offices
• Preferred
• Experience with EPC/EPCM project delivery models
• Familiarity with mining projects
• Our culture is built on four principles:
• Everyone Gets Home Safe. We never put speed or cost ahead of people.
• Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
• Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
• Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
• Join us as we build the future of responsible mineral sourcing and supply!