Mina had always been linked with a move away from Barcelona this summer with the club's purchases of non-EU players in Malcom, Arthur and Arturo Vidal filling their quote per La Liga's rules.
Mina and Gomes are expected to undergo their medicals in Barcelona as there is little time for them to travel to England to complete the formalities of the transfer.More news: Dallas County Reports First West Nile Virus Death Of The Year
The Brazil winger, a free agent having allowed his contract with Ukraine's champions to expire at the end of last season, signed a four-year contract at Goodison Park.
Colombia defender Mina, who impressed in the World Cup, could eventually cost €31.75million, while Gomes arrives on a season-long loan.
Upon joining Everton, Mina told evertontv, "It is important that the club want to fight for something".More news: Buck-a-beer details confirmed, Ontario brewery announces participation
Chelsea had looked into adding the Brazilian to their squad, and even offered him a contract, but ultimately Bernard was swayed by the chance of more regular football under the guidance of Silva at Everton.
"For me, it was really good to speak to him because I know how good he is and I feel motivated to work with him and to play for Everton, a great club".
And hence Gomes became the third Barcelona player this summer to move to Everton after Lucas Digne had earlier made his move. When I found out about this opportunity and what the manager wanted out of me I was happy. "I believe I will be able to show my best as a player here".More news: Polls close for MI and Kansas primaries