SEOUL, South Korea — North Korea on Monday gave South Korean tourism officials 72 hours to leave a mountain resort, saying it would start auctioning off South Korean-owned hotels, restaurants and other remnants of what used to be a symbol of inter-Korean cooperation.

When the resort complex opened in 1998 on the coastal foothills of Geumgangsan, or Mount Diamond, a scenic spot on the southeastern corner of the North, it helped usher in a period of détente between the two Koreas that would last a decade. The collaboration was halted in July 2008 after the shooting death of a South Korean tourist, which aggravated what was by then rapidly chilling relations between the two sides.

North Korea gave the ultimatum on Monday after talks failed to resolve a dispute over whether tourism in the resort should resume and under what conditions.

“We consider that the South has completely given up all rights on properties owned by South Korean companies and now start legal disposal of them,” the North’s official Korean Central News Agency quoted the North Korean tourism authorities as saying. “All assets owned by South Korean companies in the Geumgangsan resort are banned from being taken out as of Aug. 21.”