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 three principles:
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.