Grosgarth Mine Injection Grouting

The State of Montana’s Department of Environmental Quality is seeking a qualified contractor to perform injection grout remediation at the abandoned Grosgarth Mine site in Sheridan County. The work includes drilling approximately 55 boreholes to depths of up to ~100 ft, placing low‑mobility grout around the perimeter and high‑mobility grout in interior zones, and complying with extensive environmental, safety, and utility‑protection requirements. Bidders must submit a comprehensive qualification package, adhere to Montana resident‑labor rules, and provide cost proposals for multiple volume‑tiered grout items. • Scope: Injection‑grout placement (low‑mobility & high‑mobility) for mine‑site stabilization and contaminant containment. • Volume‑tier pricing: Separate rates for 1‑500 CY, 501‑1000 CY, and ten tiers up to 5000 CY of high‑mobility grout; plus a lump‑sum mobilization item and a $10,000 unanticipated‑services reserve. • Performance window: 1 Oct 2026 – 31 Jan 2027 (≈4 months) with strict Montana resident‑labor (≥50 % MT workers) and equal‑opportunity compliance.