Book 1431 of Photos, Page 228 ASSIGNMENT OF MINING LEASES AND RELATED AGREEMENTS THIS AGREEMENT, made and entered into this 20th day of May, 1997, but effective as of the 27th day of May, 1997 ("the Effective Date"), by and between Kerr-McGee Coal...Assignment of Mining Leases • March 11th, 1998 • Black Hills Corp • Electric services
