The 7900-hectare property will be used by the liquefied natural gas venture to offset the environmental impacts of its export project, which includes gas wells, pipelines and processing plants.
Several mining companies have been seeking to secure conservation land to offset the environmental impact of their mining projects under federal and state laws.
Coalminers have delayed their purchases of the offset land because of falling coal prices. However, coal seam gas companies have continued to make offers for land and engage in ecological assessments.
In March this year, GLNG partners, which includes companies such as Santos, bought the cattle breeding and fattening property Bottletree in the Arcadia Valley in Queensland for $13.5 million.
That 3875 hectares of good-quality grazing country looked like an expensive buy but the land also has gas reserves for future development.
Dukes Plain owner Shane Joyce confirmed Dukes Plain had been sold. "I can say that it is sold but I have signed a confidentiality agreement in regards to the company that bought it," Mr Joyce said. "I am 63 now and it's time for me to extract. The terms of trade aren't good for agriculture so to get our funds out of the land means we can set ourselves up for retirement."
The property, which sits midway between the gas fields of south-east Queensland and the Gladstone port, will be leased back to Mr Joyce for a period of five years.
Origin was unavailable for comment. Origin's Australia Pacific LNG and Santos GLNG signed a historic pipeline and gas swap agreement in October worth hundreds of millions of dollars.
One of the consortium is expected to have finalised the purchase of about 22,000 hectares on Curtis Island near Gladstone for a price estimated at more than $10 million.