There are some published news articles about the environmental concerns of the Donlin mines proposed operations, and there is some local controversy. One main concern, voiced in the public comment section of the
Environmental Impact Statement (EIS) issued by Donlin Gold Project, is that it may exceed Alaska's water and air quality regulations. The project's
Clean Water Act permit has been challenged by the
Orutsararmiut Native Council (ONS) on the grounds that there is no reasonable assurance that the project will comply with state water quality standards or Alaska's Antidegradation Policy. The proposed decision for the case is that Donlin Gold Project and the Alaska Department of Environmental Conservation, Division of Water, in issuing a certificate for Donlin, have not provided the necessary 'reasonable assurance' that water quality standards will be honored in order to proceed with mining operations. Three areas of concern are mercury levels in the water, water temperatures, and degradation of essential salmon habitat. On May 27, 2021, the Alaska Department of Environmental Conservation, after extensive review, consistently and thoroughly supported the Donlin Gold project's clean water certificate, stating,
"In this matter, Orutsararmiut (ONS) cherry-picked portions of the record describing potential impacts in a highly technical report and characterized them as conclusive. The Division consistently and thoroughly rebutted each of Orutsararmiut's assertions with analysis of relevant information and data using its subject-matter expertise," the state's notice stated. The Alaska Department of Environmental Conservation said its clean water certificate is "supported by a reasonable basis in law and substantial evidence in the record." The State said the ONS tribe's concerns had been addressed through conditions attached to the certification. •
Mercury is designated as a toxic substance under the Department of Environmental Conservation 2020 Water Quality Standards. The levels of dissolved mercury in freshwater, as defined by the Alaska Water Quality Standards is 1.4 μg/L for acute pollution (measured as the 1 hour average) or 0.77 μg/L for chronic pollution (measured as the 4 day average). According to federal regulations, all states must have an antidegradation policy, and this policy must, among other things, protect existing uses of any water body. Taking the existing use of salmon habitat into account, the ONS argues that the actions of the mining project do not provide reasonable assurance of compliance with the antidegradation policy, due to dewatering of the watershed, and removal of riparian habitat, which will significantly impact the salmon population. ==References==