Jack Govind, of Auckland, has applied to subdivide his 902ha property at Poolburn and build a large residence on each property.
Galloway resident Nick Loughnan, who has spent the past 20 years in an around the area, said the designation of Outstanding Landscapes was nothing more than "the developer's guide to Central Otago's loveliest spots".
There were at least four websites belonging to people with an interest in the area including the Goldrush multisport race and the Central Otago Environmental Society.
An offer by Mr Loughnan to provide more details on the proposal has been posted on the Goldrush website, and he has received many requests from people around the country and overseas.
Mr Loughnan said he was particularly concerned about the fishery, which he said was being "hammered" lately.
There had been numerous guided tours for overseas anglers and in summer a new practice of setting pots for koura, or freshwater crayfish, had become popular.
That was happening at Poolburn and even more so on the nearby Upper Manorburn dam.
"Thousands [of koura] are being taken that way, and these of course make up a significant part of the brown trout's diet," Mr Loughnan said.
The group formed to fight the application also has issues with the major earthworks disturbance in bund creation, site excavation, the storage of diesel and/or lpg, hazardous goods and the wastewater disposal.
"This will all run into the lake. There has been no geotechnical evidence supporting the proposed soakage field for septic tanks and I know there is a solid basement rock underlying much of those shallow soils," Mr Loughnan said.
He believes the considerable earth disturbance will aggravate the already depleted vegetation in the area.
"The applicant has no water right, and certainly won't be getting one for any irrigation, which is essential for his tussock establishment programme.
"Indeed, he is relying solely on rainwater to supply potable water for a dwelling with the capacity of up to 15 people," he said.
The Otago Goldfields Heritage Trust passed a remit on Tuesday night to prepare submissions on the application.
The trust has many guided tours through the Old Dunstan Road area for cavalcades and wants the area to remain unspoiled.
The applicant had made no contact with any of the 50 organisations under the umbrella of Central Otago Recreational Users Forum (CORUF), many of whom used the area on a regular basis and were now making submissions against the application.
Submissions close next Wednesday.
