生物多樣性研究中心、山巒協會（Sierra Club）、大峽谷信託基金（Grand Canyon Trust）聯合提出此訴訟，聲稱林務局依當局最寬鬆的標準規避公聽與環評，授權探勘鈾礦，已違反國家環境政策法案及另外兩條法例。他們認為林務局考量並不周全，包括：開採鈾礦引發的爭議、因近距離開採對大峽谷造成的嚴重衝擊、其他4項探勘計畫的累計影響，及德利信探勘公司（Denison Mines Corporation）有意在當地成立峽谷礦山等。
可可尼諾郡監委會2月5日全體決議，反對在大峽谷國家公園附近及科羅拉多河流域從事鈾礦開採。該決議要求亞歷桑那州國會議員，永久撤銷在凱伯國家森林Tusayan Ranger區的聯邦土地及House Rock Valley土地管理局管轄的土地上，礦物開採、探勘及礦產品入市的權利。
One of the great natural wonders of the world - the Grand Canyon of the Colorado River - is threatened by uranium exploration. Three conservation groups filed a lawsuit Wednesday challenging the approval of up to 39 new uranium drilling sites within a few miles of Grand Canyon National Park.
In December, the Kaibab National Forest granted British firm Vane Minerals approval to conduct exploratory uranium drilling on national forest lands along the park's southern boundary with no public hearing and no environmental review. It is the first of five such projects slated for the area.
Filed by the Center for Biological Diversity, Sierra Club, and Grand Canyon Trust, the lawsuit claims that the U.S. Forest Service violated the National Environmental Policy Act and two other laws when it approved the uranium exploration using a "categorical exclusion," the least rigorous analysis available to the agency.
The lawsuit claims that the Forest Service failed to consider the controversy surrounding uranium development, the significance of its proximity to the Grand Canyon, the overall cumulative impacts of four other future uranium exploration projects and the potential opening of Denison Corporation's Canyon Mine - all located in the same area.
The lawsuit follows a letter sent by the same three groups outlining legal problems with the approval and requesting that the Forest Service withdraw its decision.
The Forest Service claims it has little power to deny uranium development under the 1872 Mining Law. But the mining law does not go against the agency's separate obligation under the National Environmental Policy Act to carry out in-depth public and environmental reviews of such proposals.
On February 5, the Coconino County Board of Supervisors unanimously passed a resolution opposing uranium development on lands in the proximity of the Grand Canyon National Park and its watersheds.
The resolution requests the Arizona Congressional Delegation to initiate the permanent withdrawal from mining, mineral exploration, and mineral entry all federal lands in the Tusayan Ranger District of the Kaibab National Forest and the lands managed by the Bureau of Land Management in House Rock Valley.
Grand Canyon National Park is one of the world's great natural wonders whose protection for future generations has long been a priority for the citizens of Coconino County, the resolution says.
The Grand Canyon National Park also is an economic engine that now draws five million visitors per year who contribute to the economy of Coconino County, it says.