The Navajo Nation will benefit from more than $1 billion to clean up abandoned uranium mines that have left a legacy of disease and death on the reservation.

The money is part of a $5.15 billion settlement that the federal government reached with Anadarko Petroleum Corp. for the cleanup of thousands of long-contaminated sites nationwide. The settlement resolves a legal battle over Tronox Inc., a 2005 spinoff of Kerr-McGee Corp. that Anadarko acquired in 2006.

Federal and tribal officials on Thursday hailed the settlement as the largest ever for environmental contamination.

Kerr-McGee once operated about 50 uranium mines near Cove, Ariz., and a uranium mill in Shiprock, N.M., on the Navajo Nation. The more than $1 billion will address about 10 percent of the tribe's inventory of abandoned mines.