Usinas Siderurgicas de Minas Gerais S A Usiminas : Material Fact - Return of the operations of the Blast Furnace #2 of Ipatinga Plant and sale of the Company’s head office building

Usiminas Belo Horizonte Rua Prof. José Vieira de Mendonça, 3011 31310-260Belo Horizonte MG T 55 31 3499-8000F 55 31 3499-8899www.usiminas.com

(Free Translation: For reference only - Original in Portuguese)

USINAS SIDERÚRGICAS DE MINAS GERAIS S.A. - USIMINAS

Publicly Traded Company

CNPJ/MF 60.894.730/0001-05

NIRE 313.000.1360-0

MATERIAL FACT

Usinas Siderúrgicas de Minas Gerais S.A. - USIMINAS ("Usiminas" or "Company") in compliance with the provisions of article 157, paragraph 4th, of Law 6.404/1976, and of CVM Instruction No 358/2002, hereby informs its shareholders and the public in general that today the Company's Board of Officers approved the return of the operations of the Blast Furnace #2 of Ipatinga Plant, expected to occur in June 01st, 2021, which shall have a capital expenditure of approximately R$ 67.000.000,00 (sixty seven million reais). The Blast Furnace's return is aligned with Usiminas' commitment with the generation of sustainable results, as well as the Company's constant efforts to fulfill the demand of its local customers.

We also inform that the Board of Directors approved the sale of the Company's head office building to Fundação São Francisco Xavier, for the amount of R$ 130.000.000,00 (one hundred and thirty million reais), as per market basis. Fundação São Francisco Xavier, instituted by Usiminas in 1969, exercises its' activities in the areas of health and education, and intends to use the building for the expansion of its hospital network, strengthening its presence in the State of Minas Gerais and in the Country. The Company will timely inform additional details about its new headquarters.

Belo Horizonte, December 17th, 2020

Alberto Ono

Finance and Investors Relations Vice-President Officer

Classificação da informação: Pública