Members of the Oglala Sioux Tribe passed a referendum to legalize medical and recreational marijuana on the Pine Ridge Reservation in South Dakota, according to preliminary results from the tribe’s election commission.

A proposal to allow alcohol in the tribe’s casino failed.

The results of Tuesday’s vote will be certified by the end of the month. In the tally from all precincts announced on Wednesday morning, both medical and recreational marijuana passed by wide margins, with 82% of voters approving medical marijuana and 74% approving recreational pot. The alcohol proposal failed by 12 percentage points.

The Oglala Sioux will become the only Native American tribe to set up a cannabis market in a state where it’s otherwise illegal. The tribal council is next supposed to enact laws for how marijuana will be legalized and regulated. According to initial plans, the tribe will not take ownership of cannabis production or retail, but license individuals and put a retail tax on pot. The Tribal Council will take up the issue on March 31.

Chase Iron Eyes, a spokesperson for the tribe’s president, Julian Bear Runner, said the vote reflected the difference in how many tribal members perceive alcohol and marijuana. [Read more at Sioux Falls Argus Leader]