Campaigners hoping to bring part of France Quarry on Portland into community ownership are appealing for donations before the end of the month.
Future Portland is trying to raise the final £1,470 needed to cover upfront legal costs linked to buying two acres of France Quarry.
The group says it needs £5,000 in total for non-refundable legal fees, with £3,530 already raised through donations and a recent art auction.
Organisers have set a deadline of June 30 to reach the target.
They say donations are being used for legal costs, while separate pledges will later be called in to help fund the land purchase and any immediate maintenance work.
If successful, the land would be protected and brought into community ownership, securing public access for future generations.

£20m caravan scheme deferred
328 homes in Chickerell agreed
Brave victim helps bring domestic abuser to justice
Weymouth retail crime action highlighted
Weymouth summer fireworks dates confirmed
Witness appeal following alleged assault in Weymouth
Lifeboat rescue stranded catamaran
Investigation launched into substation fire
Calls for better tourism promotion
Dorset Police to use facial recognition
Warning over fake bank notes circulating in Weymouth
Drug education in Dorset to be extended