Mosman Oil and Gas (MSMN) is anticipating formal tribal approval for the 3D seismic survey at the Sagebrush helium project in Colorado by mid-August 2025.
The seismic acquisition programme is anticipated to start in late September and run through mid-October.
Mosman holds an 82.5% working interest in Sagebrush, where it is planning an extended production test at the previously drilled Sagebrush-1 well.
As part of this process, Mosman is working closely with the Ute Mountain Ute Tribe and Bureau of Indian Affairs to finalise permitting.
Biological and cultural surveys have already been completed.
Meanwhile, Mosman is also progressing the administrative process to secure BIA approval for the assignment of the Seeley lease. This is a critical step towards initiating an extended production test at the Sagebrush-1 well. A reservation-wide bond is currently being finalised to satisfy BIA requirements.
These approvals represent key milestones in the company's plan to advance the helium potential at Sagebrush, where historic gas analysis has recorded helium concentrations of 2.76% from the Leadville Formation.
Separately, Sproule, a globally recognised independent energy consulting firm, has commenced work on its independent estimate of helium resources at the Sagebrush project.
This verification process includes a comprehensive review of geological and engineering data and is expected to further validate and refine Mosman's internal assessments. Results from Sproule's report are anticipated towards the end of August 2025.
Over at Coyote Wash, meanwhile, the final environmental assessment was completed on 17 July 2025 and is currently the subject of a 30-day public comment period.
Pending the conclusion of this process, BIA approval is expected mid-August 2025. Upon approval, Mosman will hold a fully permitted exploration and development agreement over six drill-ready helium prospects identified via reprocessed 3D seismic data. The plan is to advance Coyote Wash towards drilling in 2026.
These prospective targets lie within the highly promising Leadville Carbonates and McCracken sandstones fairways, and are supported by historical drilling in the area.
"The pending approvals for both the Sagebrush and Coyote Wash Projects represent pivotal milestones for Mosman,” said Mosman’s interim chief executive Howard McLaughlin.
“With 3D seismic at Sagebrush ready to proceed and the Indian Minerals Development Agreement at Coyote Wash nearing finalisation, we are well-positioned to unlock the significant helium potential of both projects. These are transformative opportunities for Mosman."
View from Vox
Good to see Mosman making such strong progress towards production testing and potential drilling. Good relations with local communities is always key to operations like this, and Mosman appears to have this well in hand. So, plenty to look forward to in the next month or two as the action on the ground begins to hot up.