SAO PAULO, June 6 (Reuters) - Brazil's government presented on Thursday a counteroffer requesting that miners Vale and BHP and their joint venture Samarco pay 109 billion reais ($20.74 billion) as reparations for a tailings dam collapse in 2015.

The proposal is higher than a previous offer from the miners to pay the federal and local governments 72 billion reais to settle reparations for the disaster in the town of Mariana, Minas Gerais state, which killed 19 people. ($1 = 5.2554 reais) (Reporting by Peter Frontini; Editing by Gabriel Araujo)