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Department of Conservation Central Otago District operations manager Mike Tubbs said he was aware that unauthorised tracking had been happening at the Hikuwai Conservation Area and the Bannockburn Sluicings Historic Reserve.
"Both reserves offer a diverse range of mountain bike tracks, however some in our community think it’s OK to remove vegetation, build unsafe jumps and damage the landscape without seeking consent."
The damage created extra work for staff to reinstate areas, he said.
"Building your own track is not a solution and the repair costs are just a waste of public money," Mr Tubbs said.
"This kind of behaviour is inappropriate in a historic reserve, or any conservation lands."
It was also an offence under the Conservation Act, punishable by imprisonment or a fine, Mr Tubbs said.
The Hikuwai Conservation Area’s circuit of formed tracks includes a junior bike track on dryland kanuka terraces.