S.D. Codified Laws § 46A-10A-108
At the close of the election, the clerks shall proceed publicly to count the votes, which, when commenced, shall continue without adjournment or interruption until the count is completed. The count shall be conducted by taking one ballot at a time from the ballot box and counting until the number of ballots is equal to the number of names on the poll list, and if there are any left in the box, they shall be marked as extra ballots and not counted. The person having the highest number of votes for trustee shall be declared duly elected. If two or more persons have an equal number of votes for trustee, the clerks of election shall at once publicly, by lot, determine which of such persons shall be declared elected. If on opening the ballot, two or more ballots are found to be so folded that it is apparent the same person voted them, such ballots shall be marked as such and not counted. The count having been completed, a statement of the result shall be entered at length by the clerk in the minutes and publicly read by the clerk to the members attending the meeting. Such reading shall be deemed official notice of the result of the election. All ballots, pool lists, power of attorney forms, and other election materials shall be kept for sixty days by the election superintendent in a manner which guarantees their safety and integrity.
SDCL 46A-10A-108