Metallica made donations of €35,000 to both the Capuchin Day Centre in Dublin and The Irish Society for the Prevention of Cruelty to Children's (ISPCC) Childline during their visit to Ireland to play Slane at the weekend.
The band - Kirk Hammett, James Hetfield, Robert Trujillo and Lars Ulrich - shared photos on the Instagram page of their charitable foundation, All Within My Hands, which is named after a Metallica song.
"All the fans who attended #MetAtSlaneCastle last night helped raise this money for @ispcc_childline and their work providing a range of services directly to children and families and advocating for change to enhance the lives of children in Ireland," the quartet wrote.
They had earlier posted: "This leg of @metallica's #WorldWired Tour starts with a special bonus donation during rehearsal to the Capuchin Day Centre for Homeless People where they welcome people in need of food aid who have no home or are socially excluded and provide care with respect and dignity."
The band described their Slane show on Saturday as "an unbelievable vibe" and "as incredible as we were told to expect".
"The second we stepped on stage and took it all in, the Irish fans, the castle, the bowl like setting, we knew this was other worldly [sic]," wrote drummer Ulrich on Instagram. "What a privilege and an honor to play this legendary venue."