Exhibit 99.1 [ISG LETTERHEAD] January 31, 2005 Mr. Carlos M. Hernandez, Esq. General Counsel International Steel Group Inc. 4020 Kinross Lakes Parkway Richfield, Ohio 44286 Re: 280G Gross-Up Agreement Dear Mr. Hernandez: 1. In consideration of your...International Steel Group Inc • February 1st, 2005 • Steel works, blast furnaces & rolling & finishing mills
