An international group of 22 science and policy experts have published a joint commentary in the prestigious journal Science, urging United States (U.S.) and Canadian leadership to immediately address damages and risks caused by Canadian mine pollution flowing downstream into U.S. states. At a workshop led by University of Montana and Alaska researchers, the group, which included representatives from U.S. Tribes and British Columbia (B.C.) First Nations, concluded that the threats and impacts of Canadian mines on shared rivers, fisheries, and communities is not adequately assessed by the B.C. government. The letter also calls on the U.S. and Canadian federal governments to invoke the U.S.-Canada Boundary Waters Treaty of 1909 and address the fact that B.C. mine assessments are neither adequately based on defensible science nor adequately protect U.S.-B.C. transboundary waters from mining pollution.

“This letter highlights the inadequacies of British Columbia’s evaluation and permitting process for massive toxic waste dumps in major salmon-producing transboundary rivers, like the Taku, Stikine-Iskut, and Unuk-Nass river systems,” said Jill Weitz, director of Salmon Beyond Borders and one of the policy experts who co-authored the publication. “B.C.'s mine assessment process leaves Alaskans unprotected because it underestimates the risk of mine failures and contamination, and doesn’t rely on independent science.”

The Taku, Stikine-Iskut, and Unuk-Nass are transboundary watersheds and home to world-class salmon rivers that originate in northwest B.C. and flow into Southeast Alaska. These iconic rivers and their watersheds have been centers of culture, commerce, and biodiversity for thousands of years and are the lifeblood of the numerous communities and nineteen federally recognized tribes of the region. Over two-dozen, large-scale Canadian mines are in some phase of development or operation at the headwaters of these rivers.

Raymond Paddock, environmental coordinator for the Central Council of the Tlingit and Haida Indian Tribes of Alaska (Tlingit & Haida) said, “This letter validates the concerns of our Tribes in Southeast Alaska as well as our ongoing request for increased federal engagement from Canada, the United States, and Indigenous governments. We must work together to better understand and manage the proposed, existing and abandoned mines in our shared rivers.”

Tlingit & Haida has called on the U.S. federal government for action under the Boundary Waters Treaty and to meaningfully engage the tribes of Southeast Alaska. In 2015, Tlingit & Haida began working to collect baseline water quality data, sediment sampling and water quality surveys on the Taku and Stikine Rivers. In 2018, Tlingit & Haida expanded their scope to sampling on the Alsek River near Yakutat, and in 2019, they added the Chilkat and Klehini Rivers outside of Klukwan and Haines.

Tlingit & Haida has invited the tribes of the communities where sampling is occuring to create opportunities for these communities to develop their own capacity to conduct water quality sampling as well. This collaboration has allowed for capacity development, offset costs, share resources and develop and enhance partnerships within Southeast Alaska. Tlingit & Haida would like to see this type of relationship development with First Nations in British Columbia as well.

The authors of the Science letter conclude that the persistent problem of mine contamination flowing across the international boundary violates the Canada-U.S. Boundary Waters Treaty of 1909, which states that “waters flowing across the boundary shall not be polluted on either side to the injury of health or property on the other.”

“Thousands of Americans, including Tribes and members of Congress, as well as current and former U.S. governors, have urged the U.S. Department of State and Global Affairs Canada to enforce the Boundary Waters Treaty and to involve the International Joint Commission so that we can all work together to protect clean water and our way of life. We cannot ignore the science any longer!” said Tis Peterman, executive director of Southeast Alaska Indigenous Transboundary Commission (SEITC). 

As eight U.S. Senators stated in a June 2019 bipartisan letter to B.C. Premier John Horgan, “Indigenous peoples whose lands are affected by past, present and proposed mines near transboundary rivers have voiced concern and requested that the U.S. and Canadian governments undertake cumulative assessments of impacts to communities, cultural and natural resources, as well as the enforcement of the Boundary Waters Treaty of 1909.”


Central Council of the Tlingit and Haida Indian Tribes of Alaska is a tribal government representing over 31,000 Tlingit and Haida Indians worldwide. They are a sovereign entity and have a government-to-government relationship with the United States.

Southeast Alaska Indigenous Transboundary Commission is a consortium of 15 sovereign Tribal nations located in Southeast Alaska. Established in March 2014, SEITC seeks to protect the vital rivers that sustain our communities and culture. SEITC derives its authority from Tribal governments. Each member Tribe has formerly designated their representative by letter or resolution.

Salmon Beyond Borders is a campaign driven by sport and commercial fishermen, community leaders, tourism and recreation business owners and concerned citizens, in collaboration with Tribes and First Nations. We are united across the Alaska/British Columbia border to defend and sustain our transboundary rivers, jobs and way of life.

The University of Montana has an online open-access archive of images, maps and key letters and reports related to the transboundary mining issue. To access them, please  click on this link. You are welcome to use any of these in your own materials.

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