Police said the 61-year-old New South Wales woman was behind the gate when the man and horse pushed through it, causing the gate to hit the woman, while the man rode into nearby bushland.
Initial reports from police and witnesses were that the horse had knocked the woman over directly but this was later clarified. The victim’s age was also corrected overnight.
Police said the victim suffered serious injuries, including cuts and bruises, and was taken to Clermont Hospital before being transferred to Mackay Hospital with her husband.
The accused was arrested near the showground soon after the incident and was charged with dangerous operation of a vehicle (horse), common assault, trespass and obstructing police.
He was set to appear in Mackay Magistrates Court on Monday.
Footage of the incident showed the man riding a brown horse with a white stripe, galloping up to the showground shouting and whooping.
Witness Liz Cameron said it was lucky more people had not been injured, particularly with the number of children in the crowd.
Former Greens leader Bob Brown, who was leading the convoy, said he spoke to the woman immediately after the incident, and she was conscious.
Isaac Region Mayor Anne Baker condemned the incident.
«This act is deplorable and I condemn it in the strongest of terms,» Cr Baker said.
«We made it absolutely clear from the outset that disruptive behaviour from any party or person would not be tolerated.
«This rider has ignored the shared expectation for an environment of mutual respect.
«I expect they will face the full force of the law for their actions and the injury caused.
«Our thoughts are with the injured woman and we wish her a speedy recovery.»
Cr Baker said the man’s actions did not reflect the community and the council remained in contact with the Bob Brown Foundation.
Sunday’s separate rallies for mine supporters and anti-Adani protesters had been peaceful until the incident, following the convoy’s tension-filled arrival on Saturday afternoon.
On Saturday, pro-Adani residents, unions and organisations met the convoy at the gates of the showground, jeering, shouting, and waving signs.
Lucy is the urban affairs reporter for the Brisbane Times, with a special interest in Brisbane City Council.
Toby Crockford is a breaking news reporter at the Brisbane Times