Ep 10: Ontario's fast-tracking of Great Bear mine permits under the Mining Act faces Grassy Narrows lawsuit, signaling risks for mining assessments in the province.

# Environmental Intelligence **Date:** March 12, 2026 🔬 **Environmental Intelligence** — Canadian Environmental Professional Briefing **HOOK:** Ontario's fast-tracking of Great Bear mine permits under the Mining Act faces Grassy Narrows lawsuit, signaling risks for mining assessments in the province. **Executive Summary:** Ontario's advancement of the Great Bear gold mine despite pending litigation over the Mining Act and water permits under the Environmental Protection Act creates immediate uncertainty for mining proponents conducting environmental assessments, requiring reviews of Indigenous consultation obligations. A California water board rule on dairy nitrate pollution may influence CCME guidelines or provincial water quality standards in agricultural regions like Alberta and Ontario. Professionals should monitor federal Canada Gazette notices this week for any related consultations on mining or water regulations. ━━━━━━━━━━━━━━━━━━━━ ### Deep Dive Analysis With limited high-priority developments today, this briefing deep-dives into the two qualifying articles, extracting regulatory implications, cross-jurisdictional comparisons, and action items. The Ontario mining story highlights enforcement risks under provincial frameworks, while the California dairy rule offers insights for potential harmonization with Canadian water pollution controls. **Ontario Mining Act Challenge and Permit Fast-Tracking:** Grassy Narrows First Nation's lawsuit targets Ontario's Mining Act (R.S.O. 1990, c. M.14) and a water permit for the Great Bear gold mine under O. Reg. 387/04 (Water Taking and Transfer), alleging inadequate Indigenous consultation and environmental protections. This builds on prior challenges, contrasting with BC's EMA requirements for First Nations engagement in mining approvals via Protocol 13 risk assessments; in Alberta, similar issues arise under EPEA Part 2 for mine site remediation planning. The fast-tracking by the Doug Ford government ushers forward a third project, potentially shortening typical 18-24 month assessment timelines but increasing litigation risks that could delay site development or trigger compliance orders. For practitioners, this means auditing current mining ESAs in Ontario for alignment with Fisheries Act s.35(1) protections against habitat disruption, and comparing to Quebec's LQE where mining permits require explicit contaminant transport modeling. Action: Update risk registers for Ontario mining clients to factor in potential court-imposed stays, and cross-reference with federal IAA triggers for projects exceeding 5,000 t/d ore production. What to watch: The lawsuit's progression could set precedents for interprovincial harmonization, with possible appeals to the Supreme Court influencing SARA compliance across jurisdictions. **California Dairy Pollution Rule and Cross-Border Implications:** The California State Water Resources Control Board is set to release a new rule limiting nitrate pollution from dairies, targeting excess nitrogen in groundwater with thresholds potentially below 10 mg/L nitrate-N, addressing seepage into waterways; this contrasts with CCME's Canadian Water Quality Guidelines (e.g., 45 mg/L nitrate for aquatic life protection) and Ontario's O. Reg. 169/03 standards under the EPA, where agricultural runoff controls are less prescriptive. In Alberta, EPEA's Tier 1 guidelines for nitrate in soil (e.g., 200 mg/kg for commercial sites) could see influence if federal CEPA amendments incorporate US-style nutrient management plans, especially for prairie dairy operations. Practically, this may prompt updates to remediation designs in Canada using permeable reactive barriers for nitrate attenuation, with efficacy rates of 70-90% per USEPA data, and require labs to validate ISO 17025 methods for lower detection limits (e.g., 0.05 mg/L via ion chromatography). Action: Assess current groundwater monitoring programs in agricultural contaminated sites for nitrate thresholds, and pr...