Ba levelled after substitute Victor Anichebe looked to have given Everton victory two minutes from time – after earlier having a header ruled out despite the ball appearing to cross the line.
In the thrilling 2-2 encounter, Everton dominated the first half and led deservedly through Leighton Baines’s early strike until Ba’s introduction after the interval transformed Newcastle’s attacking threat.
He was on target within four minutes but Goodison Park was infuriated when Anichebe’s header dropped behind the line after being parried by Newcastle keeper Steve Harper 12 minutes from time, only for referee Mike Jones to wave play on after looking to his assistant.
Everton also felt aggrieved when an earlier goal from Marouane Fellaini was disallowed for offside. Anichebe, however, looked to have given Everton the win they felt they deserved but Newcastle’s improved second half performance brought them a draw as Ba rolled in his second in the closing moments.
It will once again ignite the debate about goal-line technology – but it will be of no consolation to Everton or manager David Moyes as they were left frustrated.
The evening started in moving fashion as Everton paid an emotional tribute to the Hillsborough families before kick-off, after last week’s revelations, as warm applause rang around Goodison Park while The Hollies’ hit “He Ain’t Heavy He’s My Brother” was played. At the same time the names of those who died in the 1989 tragedy were displayed on the big screens.
When the action got under way Everton thought they had taken the lead in the opening moments when Nikica Jelavic turned in after Fellaini’s shot had been parried by Harper.
The effort was ruled out for offside and Jelavic’s pain was increased as he injured his knee colliding with a post. It was the start of a bruising evening for the Croatian striker which ended with him limping off just before half-time.
Everton’s impressive start to the season was mirrored in their fluency early in the game, illustrated by a superb opening goal from Baines. The England defender took Steven Pienaar’s clever flick in his stride before drilling a low shot under Harper.
Newcastle, even though they spent most of the half in retreat, also had opportunities of their own. Papiss Cisse should have done better than volley wide from Phil Neville’s poor header and Baines was forced to scramble off the line from team-mate Leon Osman.
Demba Ba is only the second substitute in 2012 to come on and score twice, and the first since Jamie Mackie for QPR at Blackburn in February.