Exhibit 23.1 INDEPENDENT AUDITORS' CONSENT We consent to the incorporation by reference in Registration Statement No. 33-44922, No. 333-02845, 333-42445, No. 333-42447, No. 333-47277, and No. 333- 61128 of Wausau-Mosinee Paper Corporation on Form S-8 of our report dated January 24, 2003, relating to the consolidated financial statements of Wausau- Mosinee Paper Corporation as of and for the year ended December 31, 2002, appearing in this Annual Report on Form 10-K of Wausau-Mosinee Paper Corporation for the year ended December 31, 2002. DELOITTE & TOUCHE LLP Milwaukee, Wisconsin March 17, 2003