Colombia defender Mina, who impressed in the World Cup, could eventually cost €31.75million, while Gomes arrives on a season-long loan.
Mina has been linked with several clubs this summer, including Manchester United, but his arrival will bolster the Everton back-line.
While Bernard was finalising his transfer at Everton's Finch Farm training ground a club delegation led by the director of football, Marcel Brands, concluded deals for Mina and Gomes in Barcelona. I am also determined to do my best for Everton'. When I found out about this opportunity and what the manager wanted out of me I was happy.
"Every discussion we've had was very important in making me feel his confidence about my game".
Gomes and Mina could be registered in time to face Wolves in the Premier League opener this Saturday, but that game may come too soon for them as they look to bed in at Everton. But I was also convinced Everton could improve me and that I would be able to show my best as a player here'. Everton always was a big option for me, especially after speaking with the coach, Marco Silva.