In November 2008 Dann, with members of the Western Shoshone Defense Project and four other tribal and public interest groups, sued in federal court against the US and Canadian Barrick Gold, seeking an injunction to stop the "largest open pit cyanide heap leach gold mines in the United States - the Cortez Hills Expansion Project on Mt. Tenabo," Nevada. The Western Shoshone consider this to be sacred land. In addition to spiritual concerns, tribal and other groups are concerned about the proposed project's environmental impact on water, air and ground quality.
