# Sr. Estimator at Mariana Minerals

Sr. Estimator at Mariana Minerals in Houston, TX. On-site, full-time. Posted July 31, 2026.

- Company: Mariana Minerals
- Location: Houston, TX
- Workplace: On-site
- Job type: Full-time
- Experience: 7+ years
- Posted: 2026-07-31
- Apply: https://jobs.ashbyhq.com/marianaminerals/76c24ff0-cdff-4d57-a204-f8f387830c01/application
- Source: https://jobmagic.ai/jobs/sr-estimator-mariana-minerals-m8fkde

## Requirements

- 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

## Description

**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!**