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The company granted consent in December for a series of zip lines and a bungy jump over the Ox Burn gorge in Glenorchy has now applied to extend the length of the cable system.
Canyon Adventures Ltd has asked to vary a condition of its resource consent to allow tension on the planned cabling to be reduced.
''This will improve the overall design, safety, and integrity of the structure of the TWCS (twin wire cable system),'' the application said.
Instead of being ''taut'' across the gorge, the extension would allow the southern portion of the fixed cable to ''sag''.
In 2012, the Otago Daily Times reported the activity would involve a twin-cable system spanning 275m across the gorge with the cables securely anchored 5m-10m into surrounding rock.
The original application said the site was located off Rees Valley Rd in a ''discreet, remote location'' and customers would be transported by a minibus.
The Ox Burn was described as ''a steep rugged alpine gorge system that descends in an east to west direction from the peaks above to the valley floor below'' with substantial patches of beech forest.
Thrillseekers would ride the zip line from one platform to another, from where they would attach to a twin-wire cable system and be pulled across to the bungy platform for a bungy leap.
People could be brought straight on to the bungy platform in a steel cage that would also run on the cable.
The companies office shows Christopher Russell, of Tauranga, is the sole director and shareholder of Canyon Adventures Ltd.