5 December 2025 – Perth, Australia | Pinnacle Minerals Ltd (ASX:PIM) has commenced its first systematic modern exploration program for the Antimony Queen Project in Washington State in the United States, targeting historic antimony-gold underground workings in the Gold Creek District.
Activities in the field are now underway across the area, which includes multiple historic adits and more than 1,000 feet of underground development. This provides a brownfields platform where proven structures and mineralisation can be rapidly followed by modern exploration techniques. The Antimony Queen Project claims cover approximately 500 hectares (~5km²) within a historically productive antimony-gold district that includes extensive underground and surface workings.
Initial fieldwork has now completed, including on-ground geological mapping and sampling designed to confirm mineralisation and validate the extent of historical underground and surface workings.
Historical sampling datasets are also under review to assess the reliability of rock-chip and channel samples collected from the Antimony Queen adits and surface diggings, supporting development of a modern 3D model of the historic workings.
Modern exploration targeting is also progressing, with airborne magnetic and satellite datasets being processed to delineate structural controls and define new high-priority drill targets. Assay results from current rock-chip and channel sampling are expected in the coming weeks and will feed directly into geological modelling and target refinement.
U.S.-based consultants have been engaged and discussions with local authorities are progressing to establish the pathway and requirements for drill permitting, as Pinnacle advances plans for a maiden drilling program at Antimony Queen.
Pinnacle’s Executive Chairman, William Witham, commented: “Our work at Antimony Queen presents a genuine opportunity to revitalise a historic U.S. antimony and gold district using modern exploration techniques and technology. The early results from our Antimony Queen Gold Creek fieldwork are highly encouraging and represent an important milestone as Pinnacle accelerates its transition into an active U.S explorer within a rapidly expanding critical minerals portfolio.
“The verification of multiple historic workings, the extent of underground development, and the confirmation of mineralisation across the project area reinforce both the quality of this asset and its strong discovery potential. With assay results pending, geophysical datasets being processed and drill permitting progressing, we are now building a clear pipeline of exploration catalysts.
“Antimony Queen strengthens our growing North American footprint alongside our Thunder Mountain Project in Idaho, positioning Pinnacle to play an increasingly important role in the U.S supply chain for critical minerals. We look forward to advancing exploration, defining high-priority drill targets, and delivering value for our shareholders.”
The Antimony Queen Project is located within a recognised U.S. critical minerals corridor, strengthening Pinnacle’s position as a growing North American explorer focused on antimony and other strategic minerals, alongside its Thunder Mountain Project in Idaho.
Assay results from current rock-chip and channel sampling are expected in the coming weeks, and will be integrated into a modern 3D model of the Antimony Queen workings to guide the design of the planned maiden drilling program. Further detailed surface mapping and geological sampling will continue across the Project, alongside interpretation of the airborne magnetic and satellite datasets currently being processed to delineate structural controls and identify new high-priority drill targets.
About us:
About Pinnacle Minerals
Pinnacle Minerals Ltd (ASX: PIM) is a technology minerals exploration company focused on creating shareholder value through the discovery and development of high-quality battery and critical minerals projects in the United States, Canada, Western Australia, and South Australia.
The Company’s U.S. projects are located in one of North America’s most prospective critical minerals regions in Washington and Idaho, near Perpetua Resources’ world-class Stibnite Antimony-Antimony Project. Pinnacle also holds assets in James Bay, Quebec, proximal to the Adina Lithium Project (ASX: WR1), and in Australia, the Company’s exploration assets are prospective for rare earth elements (SA) and heavy mineral sands (WA)
Contact details:
Jane Morgan
Jane Morgan Management
Investor & Media Relations
[email protected]