S.D. Codified Laws § 21-19-21
In such answer or such demand as the case may be the creditor must designate one appraiser. The claimant must within three days after such service file and serve upon the creditor a designation of one appraiser. The two appraisers so selected must select a third appraiser, and if they fail to agree thereon, such third appraiser must be selected by the court. If the appraiser designated by either party is unable to act the vacancy may be filled by the party who originally made such designation. If either party fails to make an appointment which he is entitled to make, the court may make such appointment. Appointment of any appraiser by the court must be on application by the debtor, claimant, or creditor, upon such notice as the court deems reasonable.
SDCL 21-19-21