Exhibit 4.1 FIRST SUPPLEMENTAL INDENTURE FIRST SUPPLEMENTAL INDENTURE (this "Supplemental Indenture"), dated as of September 30, 2004, among Ameristar Casino Black Hawk, Inc., a Colorado corporation, and Richmond Street Development, Inc., a...Supplemental Indenture • November 9th, 2004 • Ameristar Casinos Inc • Services-miscellaneous amusement & recreation • New York
