The Hammers have confirmed that the former Aston Villa ace has signed a two-year contract at the London Stadium - which may surprise some given that there was previous speculation that he may be arriving on loan.
Shortly after the transfer of Mina to Everton, the loan deal of André Gomes also to Everton was made public.
The duo become the second and third players to swap Camp Nou for Goodison Park this summer, following Lucas Digne to Merseyside.
The 25-year-old described his spell with Barca as "a kind of hell" during a candid interview in March, adding that he does not "feel good on the pitch".
"I chose Everton because of all the things I had heard about Marco Silva and after speaking to him I was happy with what he said to me", the midfielder said. The Club reserves the right to buy back the player.
"He has experience of playing in the Champions League for Shakhtar Donetsk for the past five years and the fact he has 14 caps for Brazil is a further reflection of his quality".
Mina, 23, only joined Barca six months ago from Palmeiras, but coach Ernesto Valverde has not been convinced by him and the club have made a decision to take advantage of his increased value following an impressive World Cup.
Margot Kidder's Death Ruled Suicidal Overdose
She was also a political activist who was arrested in Washington in 2011 at a protest over the proposed Keystone XL pipeline. As it was previously reported, the police discovered Margot passed away on the 13th of May in her home in Livingston.
Manchester United fail with Diego Godin approach
The Uruguayan defender would be an alternative to linked names Toby Alderweireld , Jerome Boateng and Harry Maguire . And BBC Sport journalist Stone has now revealed that the Red Devils were always wary of bidding for the 32-year-old.
Indonesia evacuates tourists after Lombok quake kills 91
The Bali and Lombok airports continued operating on Sunday night, according to the director general of civil aviation. In 2004, the Indian Ocean tsunami killed 226,000 people in 13 countries, including more than 120,000 in Indonesia.
Surprise! No One Buys Things via Alexa
But with Amazon rolling out the Answer Update feature, conversations with Alexa are likely to become more engaging. One of the other features, being an Amazon product after all, is the ability to order items via voice and shop.
Yellow Warnings Issued As Heatwave Grinds To A Halt
Ms Diamond said: "This means there is an increased likelihood of warmer-than-average temperatures and below-average rainfall". Bookmaker Ladbrokes said the United Kingdom could still see 35C at least once this week before the heatwave ends.
Samsung Note 9 to have 512GB internal memory
Unveiled today in NY , the Galaxy Note 9 features a large battery, a Bluetooth-enabled S Pen , and lots of storage. At the other, it's also catering towards the need of business users by upgrading the phablet's S-Pen.