Mobile Crushing Foreman, Materials Division

About Onyx Corporation Onyx Corporation is a family-owned construction company based in Acton, Massachusetts, specializing in heavy civil construction, excavation, landscape construction, and construction materials. With a commitment to quality workmanship, safety, and customer satisfaction, Onyx takes pride in delivering projects that make a lasting impact on the communities it serves. Through its Excavation, Landscape Construction, and Materials divisions, Onyx provides a wide range of services and expertise to support projects throughout the region. Our team combines industry knowledge, skilled employees, modern equipment, and a hands-on approach to get the job done safely and efficiently. As a family-owned company, Onyx values its people and recognizes that our employees are the foundation of our success. We strive to foster a collaborative, team-oriented work environment where employees are respected, supported, and given opportunities to grow and develop their careers. At Onyx, we believe in working together, taking pride in what we do, and building a company where people want to work and grow. Job Summary: Onyx Corporation is seeking an experienced and motivated Mobile Crushing Foreman to oversee daily operations of our mobile crushing and screening equipment. This hands-on leadership position is responsible for supervising the Operations coordinating equipment and material movement, maintaining production efficiency, and ensuring safe operations across multiple job sites in Massachusetts and New Hampshire. The ideal candidate has a strong background in aggregate production, heavy equipment operation, mechanical troubleshooting, and Team leadership. This individual must be able to work independently, solve problems in the field, and maintain high standards for safety, quality, and productivity. Key Responsibilities Crushing Operations & Production Oversee daily setup, operation, and breakdown of mobile crushing and screening plants. Coordinate crushing activities to meet production schedules, material specifications, and project demands. Monitor production rates, material quality, and equipment performance to maximize efficiency. Manage the movement, setup, and relocation of crushing equipment between job sites. Operate crushers, screeners, loaders, excavators, and other heavy equipment as needed. Identify and resolve production issues to minimize downtime. Equipment Maintenance Conduct daily equipment inspections and ensure proper maintenance of crushers, screens, conveyors, and supporting equipment. Troubleshoot mechanical issues and coordinate necessary repairs. Oversee preventive maintenance, including lubrication, wear-part inspections, and replacement of components. Work closely with maintenance personnel to minimize equipment downtime. Maintain accurate equipment inspection, maintenance, and production records. Safety & Compliance Enforce company safety policies and applicable OSHA and MSHA regulations. Conduct daily toolbox talks and job hazard assessments. Ensure proper lockout/tagout procedures are followed during maintenance and repairs. Maintain clean, organized, and safe work areas. Identify potential hazards and take immediate corrective action. Report incidents, equipment damage, and safety concerns to management. Qualifications Minimum 3–5 years of experience in mobile crushing, screening, aggregate production, or a related heavy construction operation. Previous foreman or crew leadership experience preferred. Strong mechanical knowledge of mobile crushers, screening plants, conveyors, and related equipment. Experience operating loaders, excavators, and other heavy equipment. Ability to troubleshoot equipment problems and perform basic mechanical repairs. Knowledge of OSHA and applicable MSHA safety requirements. Strong communication, organizational, and problem-solving skills. Ability to read and understand production schedules and equipment manuals. Valid driver's license and ability to travel be…

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