NASA is now working with private companies to take the first steps in exploring the moon for valuable resources like helium 3 and rare earth metals. Initial proposals are due tomorrow for the Lunar Cargo Transportation and Landing by Soft Touchdown program (CATALYST). One or more private companies will win a contract to build prospecting robots, the first step toward mining the moon. The contract will be a no funds exchanged Space Agreement Act, which means the government will not be directly funding the effort, but will receive NASA support.