Sagebrush Resource Update
Updated net resource figures for Sagebrush project following increase in working interest to 90%.
- Helium net to Quantum (2U estimate) 101 MMscf
- Hydrocarbon Gas net to Quantum (2U estimate) 825 MMscf
- CO₂ net to Quantum (2U estimate) 1,473 MMscf
- Total Raw Gas net to Quantum (2U estimate) 3,631 MMscf
- Quantum working interest 90%
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Quantum Helium Limited (AIM: QHE), advancing helium, hydrogen and hydrocarbon projects in the USA, provides updated net resource figures for the Sagebrush Helium Project in Colorado following the increase in its working interest from 82.5% to 90%, as announced on 11 December 2025.
The underlying gross volumes remain unchanged from the Sproule ERCE independent evaluation announced on 18 September 2025 under SPE PRMS Standard (*), with Quantum's higher working interest now reflected in the revised net figures.
Updated Net Prospective Resources - Sagebrush
(Net After 16.67% Royalty, Net to Quantum at 90% WI)
Source of gross resource data: Sproule Sagebrush Resource Evaluation Report (18 September 2025).
Helium (MMscf)
| Estimate | Gross Helium | Net After Royalty | Net to Quantum (90% WI) |
|---|---|---|---|
| 1U | 80 | 67 | 60 |
| 2U | 134 | 112 | 101 |
| 3U | 269 | 224 | 202 |
| Hydrocarbon Gas (MMscf) | |||
| Estimate | Gross Hydrocarbon Gas | Net After Royalty | Net to Quantum (90% WI) |
| 1U | 661 | 551 | 496 |
| 2U | 1,101 | 917 | 825 |
| 3U | 2,218 | 1,848 | 1,663 |
| CO₂ (MMscf) | |||
| Estimate | Gross CO ₂ | Net After Royalty | Net to Quantum (90% WI) |
| 1U | 1,161 | 968 | 871 |
| 2U | 1,964 | 1,637 | 1,473 |
| 3U | 3,899 | 3,249 | 2,924 |
| Total Raw Gas (MMscf) | |||
| Estimate | Gross Total Gas | Net After Royalty | Net to Quantum (90% WI) |
| 1U | 2,906 | 2,422 | 2,180 |
| 2U | 4,842 | 4,034 | 3,631 |
| 3U | 9,760 | 8,133 | 7,320 |
Sagebrush Seismic Acquisition Update
The high-resolution 3D seismic programme at Sagebrush continues to progress very well. Field crews have maintained strong productivity throughout the past week, with data recording and receiver retrieval proceeding smoothly, and overall acquisition now well advanced.
Based on current progress, the Company expects the seismic survey to be substantially completed by the middle of this week, after which the dataset will move into processing. Initial processed outputs remain on track for delivery in January.
Glossary
| Term | Definition |
| 1U / Low Estimate | At least a 90% probability that the quantities recovered will equal or exceed this estimate. |
| 2U / Best Estimate | At least a 50% probability that the quantities recovered will equal or exceed this estimate. Often considered the "most likely" case. |
| 3U / High Estimate | At least a 10% probability that the quantities recovered will equal or exceed this estimate. Represents upside potential. |
| MMscf | Million standard cubic feet of gas, measured at standard conditions of temperature and pressure. |
| Mscf | Thousand standard cubic feet of gas, measured at standard conditions of temperature and pressure. |
| Prospective Resource | Those quantities of petroleum estimated, as of a given date, to be potentially recoverable from undiscovered accumulations by application of future development projects. |
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