The tables below summarise the resulting recoverable gas hydrocarbons within Denison’s area of 100% ownership as at 30 September 2025
Independently assessed by Netherland Sewell & Associates (NSAI).
Conventional Gas Reserves
| Proved (1P) | Proved + Probable (2P) | Proved + Probable + Possible (3P) | |
| Gas (PJ) | 52.7 | 86.0 | 110.5 |
| Oil (MBBL) | 26.1 | 47.5 | 60.2 |
Contingent Gas Resources – Net Denison Interest*
| Low Estimate (1C) | Best Estimate (2C) | High Estimate (3C) | |
| Tight Gas (BCF) | 43.4 | 64.7 | 109.4 |
| Tight Gas (PJ) | 45 | 67 | 113.3 |
| Coal Seam Gas (BCF) | 290.6 | 888.5 | 1,220.30 |
| Coal Seam Gas (PJ) | 297.7 | 910.7 | 1,250.70 |
*Denison owns a 50 percent interest in PLs 43 and 44 and a 100 percent interest in ATP 2060 for these tight gas properties
Prospective Resources – Net Denison Interest*
| Low Estimate (1U) | Best Estimate (2U) | High Estimate (3U) | |
| Tight Gas (BCF) | 246.5 | 482.2 | 946.5 |
| Tight Gas (PJ) | 255.3 | 499.5 | 980.4 |
*Denison owns a 50 percent interest in PLs 43 and 44 and a 100 percent interest in ATP 2060 for these tight gas properties
Definition:
- Proved reserves are those quantities of oil and gas which, by analysis of engineering and geoscience data, can be estimated with reasonable certainty to be commercially recoverable; probable and possible reserves are those additional reserves which are sequentially less certain to be recovered than proved reserves.
- Contingent resources are those quantities of petroleum estimated, as of a given date, to be potentially recoverable from known accumulations by the application of development project(s) not currently considered to be commercial owing to one or more contingencies.
- Prospective resources are those quantities of petroleum estimated, as of a given date, to be potentially recoverable from undiscovered accumulations by application of future development projects.