HENDERSON, Nev. » MGM Resorts International is selling a Henderson casino that was built before the Hoover Dam and contains a vault that once guarded wages for the project’s construction workers.

The casino company announced Friday that it would sell the 83-year-old Railroad Pass Hotel and Casino to Henderson-based First Federal Realty.

The new owners say they plan to keep all current employees.

Railroad Pass is located near Boulder City and opened in 1931 as a casino and dance hall. Its operator received the fourth gambling license in U.S. history to run the casino, and the mayor of Las Vegas granted Railroad Pass permission to operate a single roulette wheel.

MGM and First Federal Realty did not disclose the sale price for the 120-room hotel. The deal is contingent upon regulatory approvals.