S.D. Codified Laws § 46A-4-70
If the assent of the holders of the bonds, when required, and in case of any contract with the United States the assent of the secretary of the interior be filed and entered of record and if there be written objections presented by twenty-five percent of the electors of the district which have not been withdrawn, then the board of directors may order an election to be held in the district to determine whether an order shall be made excluding such lands from the district as mentioned in the resolution. The notice of such election shall describe the boundaries of all the lands which it is proposed to exclude, and such notice shall be published once each week for at least two successive weeks prior to such election in a newspaper published within the county where the office of the board of directors is situated. If any portion of such territory to be excluded lies within another county or counties, then such notice shall be so published in a newspaper published in each of such counties. Such notice shall require the electors to cast ballots which shall contain the words "for exclusion" and "against exclusion," or words equivalent thereto. Such election shall be conducted in accordance with the general election laws of the state; provided no particular form of ballot shall be required.
SDCL 46A-4-70