Senior Mechanical Estimator - Mining

Job Title: Senior Mechanical Estimator (Mining) Company: Loenbro, LLC Business Unit/Department: Estimating Location: Gilbert, Arizona Reports to: Pre-Construction Manager Employment Type: Full-Time FLSA Classification: Exempt About Loenbro 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. Job Summary The Senior Mechanical Estimator (Mining) is responsible for developing accurate, competitive, and comprehensive cost estimates for multi-discipline construction and industrial services projects supporting mining and heavy industrial clients. This role requires the ability to estimate across multiple service lines — Structural Fabrication & Erection, Piping, Mechanical Equipment Setting, Civil Earthwork & Concrete, and (as a plus) Electrical — and to synthesize those disciplines into cohesive, winning proposals. The ideal candidate combines strong technical and craft knowledge with commercial acumen, is comfortable reading complex drawings and specifications across trades, and can build relationships with clients, engineers, and subcontractors throughout the pursuit and proposal process. Works with Precon SME Estimators to collaborate an all inclusive bid when needing assistance. KEY RESPONSIBILITIES Estimating & Takeoffs Prepare detailed quantity takeoffs and cost estimates for structural steel fabrication and erection, process and utility piping, mechanical equipment setting and rigging, civil earthwork, concrete (foundations, slabs, structures), and electrical scopes when applicable. Analyze RFPs, RFIs, drawings, specifications, and scopes of work to identify all cost-driving elements and potential risks. Develop labor hour estimates using historical production rates, craft labor agreements, and established estimating databases. Solicit, evaluate, and level subcontractor and vendor quotes for scopes outside self-perform capability. Build and maintain HeavyBid estimate templates, unit cost databases, activity and cost coding structures, and historical production data across all service lines. Structure estimates so labor hours, crew makeup, quantities, and production rates can be cleanly exported and handed off to the Scheduling Department for CPM schedule development. Proposal Development Compile complete, well-organized bid packages including cost narratives, schedules, exclusions and clarifications, and commercial terms. Coordinate with Operations, Project Executives, and Safety to validate assumptions, means and methods, and constructability. Support development of project execution plans, staffing plans, and schedule logic (5x10, 5x12, or other workweek models) as needed for client evaluation. Partner with the Scheduling Department to deliver estimate-driven inputs for Microsoft Project schedules, and validate that the resulting schedule aligns with estimated durations, manpower loading, and equipment utilization. Participate in bid strategy sessions and pricing reviews with leadership. Client & Site Engagement Attend site walks, pre-bid meetings, and client interviews to gather scope clarity and build relationships. <li data-leveltext="•" data-font="" data-listid="2" data-list-defn-props="{"335552541":1,"335559685":431,"335559991":288,"469769242":[8226],"46977