Senior Mechanical Estimator - Mining

Job Title:

Senior Mechanical Estimator

Company: Loenbro, LLC
Business Unit/Department: Estimating
Location: Gilbert, Arizona
Reports to: Pre-Construction Manager
Employment Type: Full-Time
FLSA Classification: Exempt

Loenbro is a trusted, long-term construction lifecycle partner to thousands of customers across the U.S. Our market spans all industries and our service offerings include Critical Electrical, Mechanical & Structural, Soft Crafts, Inspection, Underground Maintenance and Installation, and Fabrication. Our expertise lies in simplifying the complex and establishing long-standing relationships with our partners. We have a national presence but a local approach—every customer benefits from our capabilities and our care.

At Loenbro, we don’t just offer jobs—we build careers grounded in integrity, teamwork, excellence, and purpose. Join a team where your expertise is valued, your growth is supported, and your work helps maintain and enhance the critical infrastructure that powers communities across the nation.

The Senior Mechanical Estimator is a key leader within the Estimating team, responsible for developing accurate, competitive, and comprehensive mechanical construction estimates for complex industrial projects. This role oversees the full mechanical estimating process—including quantity takeoffs, labor and equipment analysis, material pricing, subcontractor evaluations, and risk assessments—for projects up to $25M or higher depending on scope and self‑performance. The Senior Mechanical Estimator interprets mechanical drawings, piping and equipment specifications, isometrics, and contract documents to build detailed work breakdown structures and precise cost models.

Specifically, this role will focus on estimation within the mining industry, taking on estimating for specific mining-related projects in the given region.

• Lead preparation of detailed estimates for projects up to $50MM, considering complexity and self-performance scope.
• Validate quantity take-offs and ensure accurate input into estimating software.
• Apply advanced cost analysis and contingency planning for risk mitigation.

• Interpret and analyze P& and other technical documents.
• Utilize HCSS Heavy Bid software for accurate and efficient estimating.
• Incorporate design methodologies such as Design Assist and Design Build when applicable.

• Represent the estimating team in client meetings, pre-bid conferences, and negotiations.
• Communicate clearly with operations, procurement, and project management teams during pre-construction.

• Develop and enforce estimating procedures, including pre-estimate checklists and opportunity matrices.
• Oversee bid review meetings and ensure timely submission of RFIs and proposals.
• Ensure compliance with contractual requirements and company standards.

• Provide pragmatic analysis of project execution to optimize efficiency and profitability.
• Generate high-level cash flow projections, risk analysis reports, and resource-loaded schedules.
• Support business development with conceptual estimates and ROM pricing for new opportunities.

Other duties may be assigned as needed to support business operations.

• Minimum of 3-5+ years of experience in industrial construction estimating, with at least 2 years in a leadership role.
• Previous experience Estimating within the mining industry
• Estimating experience with Accubid, HCSS, Heavy Bid, and/or Heavy Job
• Ability to read and interpret P& and other technical schematics.
• Scheduling experience with MSP or P6.
• Excellent communication skills – both verbal and written.
• Excellent computer skills including Microsoft Office Suite emphasis on Project Schedule and Excel Tracking.

• Bachelor’s degree in construction management, Engineering, or related discipline
• Direct Involvement In civil, concrete, structural steel, equipment setting, and mechanical construction.
• Experience with Design Assist and Design Build delivery methods.
• Proven ability to manage multiple complex bids simultaneously.