Bongers Greycliffe-Jambin Wetland (Revoked)

Bongers Greycliffe-Jambin Wetland (Revoked) is a soil carbon sequestration project located in Jambin, approximately 29km north-northwest of Biloela in Central Queensland. It was registered in May 2017 and covers an area of 727.48 hectares.

Soil carbon projects involve building soil organic carbon by changing agricultural management practices. Under the Measurement of Soil Carbon Sequestration in Agricultural Systems methodology, these projects require baseline physical soil sampling and subsequent physical measurements over time to demonstrate an increase in soil carbon, which must then be maintained throughout the permanence period.

The Jambin and wider Callide Valley region is known for agriculture and is heavily utilized for beef cattle grazing, dairy farming, and mixed cropping. The area typically experiences a sub-tropical to semi-arid climate with moderate rainfall. Soils in the region are often characterized by fertile alluvial plains and cracking clay soils (Vertosols) that are highly suited for pastures and cropping.

This project aimed to increase carbon in the agricultural soil by altering the stocking rate, duration, or intensity of grazing, rejuvenating pastures by seeding, permanently maintaining new pastures, applying nutrients to address material deficiencies, and converting from intensive tillage to reduced or no-tillage practices. It also used mechanical means to add or redistribute soil through the profile. The project was originally registered under the 2014 soil carbon methodology before being varied to the 2018 methodology on June 2, 2021. After an area variation later that month, the project was ultimately revoked on August 5, 2025, under section 30 of the CFI Rule, which is the standard mechanism allowing for the voluntary revocation of an eligible offsets project declaration.