More than 15 fire trucks and tankers are at the scene of the blaze.
Four people were killed in the two-vehicle crash last month.
Vince Burke has spent the past 50 years collecting the rocks
"It might be little horses, but the horse and people make up for it in personality."
It brings the Easter road toll to seven.
Three people were killed and several injured in the crash.
It happened during a car show earlier this month.
The person died at the scene.
The popular bar, restaurant and music venue was a fixture of the city's Arts Centre for decades before the 2011 earthquake.
