Mosman Oil and Gas Limited (MSMN) has secured approval from the Ute Mountain Ute tribe to conduct its 3D seismic acquisition programme at the Sagebrush project in Colorado, USA.
Mosman holds an 82.5% working interest in Sagebrush.
The seismic acquisition is scheduled to commence in late September and run through mid-October 2025.
The 3D seismic survey is a key component in refining drill targets and advancing towards an extended production test at the previously drilled Sagebrush-1 well, which recorded historic helium concentrations of 2.76% from the Leadville Formation.
Meanwhile, consultants from Sproule are well advanced in the independent verification of the helium resources at Sagebrush. Sproule’s work includes a comprehensive review of geological and engineering data, with results expected towards the end of August 2025.
Mosman also anticipates news on permitting at its Coyote Wash project in the coming weeks. The final environmental assessment for Coyote Wash was completed on 17 July 2025 and is currently in the final stages of the permitting process.
"We are delighted to have received the Ute Mountain Ute tribe's approval for the Sagebrush 3D seismic survey, which is a vital step forward in unlocking the project's substantial helium potential,” said Mosman’s interim chief executive Howard McLaughlin.
“With seismic now set to proceed and the Coyote Wash approval also expected soon, Mosman is entering an exciting period of operational momentum across both key projects."
View from Vox
Newsflow from Mosman is likely to be strong as we start to move into autumn, with activity both at Sagebrush and at Coyote Wash. The company appears to be on a firm footing with the locals in Colorado, an essential prerequisite for moving forward. Expect the market to take an increasing interest as momentum builds.