The 23-year-old Mina, who was impressive in defence at this year's World Cup in Russian Federation where he also scored three goals, will rejuvenate an ageing Everton back line while offering a threat from set-pieces at the other end of the pitch.
"I'm delighted to sign for this fantastic club - it's a good day for me", said Gomes to Everton's in-house TV channel.
Mina had been strongly linked with a move to Manchester United following an impressive 2018 World Cup with Colombia, but Everton secured his signature.
The club reserves the right to buy back the player.
'FIRENADO' captured in Derbyshire The cause of the fire has not yet been established and an investigation has now begun, said a spokesman for the fire service. The fire involved stacked plastic pallets, which were ordinarily used for making plastic crates for supermarkets.
The fee represents a healthy profit for the Spanish champions, who signed Mina from Palmeiras for €11.8m (£10.6m) only in January and obtained a buy-back option in the deal.
"The manager made me feel confident about playing here".
Bernard, a 25-year-old capped 14 times by Brazil, was a free agent after his contract with Shakhtar Donetsk expired.
"The English club will pay FC Barcelona €30.25 million plus €1.5 million in variables". He is a very good coach and he has achieved really good things at other clubs. This is a great opportunity for me and I am looking forward to competing here.
There was a predictably frantic conclusion to the last hours of business, the Premier League waiting to register ten players after the 5pm deadline, deal sheets submitted pending medicals and the agreement of personal terms.