FLANDREAU, S.D. — The small South Dakota Indian tribe known as the Flandreau Santee Sioux already has a successful casino, a 120-room hotel and a 240-head buffalo ranch.

Now it’s undertaking a new venture — opening the nation’s first marijuana resort on its reservation. The experiment could offer a new money-making model for tribes nationwide seeking economic opportunities beyond casinos.

Santee Sioux leaders plan to grow their own pot and sell it in a smoking lounge that includes a nightclub, arcade games, bar and food service, and eventually, slot machines and an outdoor music venue.

Tribal President Anthony Reider envisions the resort as “an adult playground.”

The tribe says the project could generate up to $2 million a month in profit. The first joints are expected to go on sale New Year’s Eve.