0001130464-05-000410 425 1 20051125 20051125 BLACK HILLS CORP /SD/ 0001130464 4911 460458824 SD 1231 425 34 001-31303 051226923 625 9TH STREET PO BOX 1400 RAPID CITY SD 57709 6057212343 625 9TH STREET PO BOX 1400 RAPID SD 57709 BLACK HILLS HOLDING CORP 20001222 BLACK HILLS CORP /SD/ 0001130464 4911 460458824 SD 1231 425 625 9TH STREET PO BOX 1400 RAPID CITY SD 57709 6057212343 625 9TH STREET PO BOX 1400 RAPID SD 57709 BLACK HILLS HOLDING CORP 20001222 425 1 rule14a12filing.htm SCHEDULE 14A12