/etc/polkit-1/localauthority/50-local.d/10-user-mount.plka

[Configurations]
Identity=unix-user:user
Action=org.freedesktop.udisks.filesystem-mount;org.freedesktop.udisks.filesystem-unmount-others;org.freedesktop.udisks.drive-eject;org.freedesktop.udisks.drive-detach
ResultAny=yes