RENO, Nev. (AP) — A federal judge has denied environmentalists’ request for a court order temporarily blocking the government from digging trenches for archaeological surveys at a lithium mine planned near the Nevada-Oregon line. The proposed Thacker Pass mine is home to the biggest known U.S. deposit of lithium. U.S. District Judge Miranda Du said in a ruling late Friday in Reno that four conservation groups failed to prove the trenches across one-quarter acre would cause irreparable harm to sage grouse habitat. She plans to decide later this week whether a Nevada tribe can seek a similar injunction based on claims the digging would disturb sacred burial grounds.