Mammoth Minerals has intersected a fresh high-grade gold zone over 700 metres from its historic Buster Gold Mine in Nevada, expanding the Excelsior Project's mineral footprint. Concurrent surface sampling at the Blue Dick Prospect confirms extensive silver and gold mineralisation, underpinning a robust drilling campaign across multiple targets.
- New parallel high-grade gold zone intersected at Buster Trend
- 10.67m at 3.76g/t Au including 4.6m at 6.86g/t Au in latest RC drilling
- Surface sampling at Blue Dick yields bonanza silver and gold grades
- Kentucky trend shows expanding mineralisation with high-grade assays
- Ongoing drilling program targets over 6.5km of mineralised strike
Discovery of Parallel High-Grade Gold Zone at Buster Trend
Mammoth Minerals Limited (ASX:M79) has unveiled a significant new high-grade gold intercept at its Excelsior Gold-Silver Project in Nevada, USA. The latest reverse circulation (RC) drilling at the Buster Trend corridor intersected 10.67 metres grading 3.76 grams per tonne (g/t) gold from 198.2 metres, including a higher-grade segment of 4.6 metres at 6.86 g/t gold. This intercept, from hole MEXRC2637 at Lunchbox Ridge, lies over 700 metres along strike from the historical Buster Gold Mine zone and reveals a previously untested parallel mineralised structure, substantially broadening the project's gold potential.
The new mineralisation remains open both along strike and down-dip, suggesting considerable scope for resource expansion. This discovery challenges earlier understandings of the Buster Trend's mineral architecture and highlights the presence of multiple feeder structures that channel mineral-rich fluids into the host limestone sequences, characteristic of Carlin-type gold deposits.
Bonanza-Grade Surface Sampling at Blue Dick Prospect
Complementing the drilling success at Buster, surface sampling at the Blue Dick Prospect has returned exceptional silver and gold grades, reinforcing the project's strategic value amid rising demand for critical minerals. Assays include extraordinary silver values exceeding 1,000 grams per tonne (g/t) alongside significant gold and base metal concentrations; such as 1,190 g/t silver with 4.7 g/t gold and 4.55% lead in sample MREX01209, and 1,612 g/t silver with 0.37% copper and 5.3% zinc in MREX01062.
Ongoing RC drilling at Blue Dick is progressing with nine of 29 planned holes completed, targeting high-grade trends across more than 6.5 kilometres of mapped mineralisation. This program aims to delineate and extend these bonanza-grade zones that have not been systematically explored in the modern mining era.
Kentucky Trend Expansion and Broader Excelsior Prospects
The western Kentucky trend within the Excelsior claims continues to deliver promising results associated with intrusive geological features. Highlights include assays up to 3,877 g/t silver, 2.3 g/t gold, 1.45% copper, and 4.1% lead in sample MREX01064, underscoring the area's potential as a walk-up drill target.
Field campaigns across the broader Excelsior Project area are systematically advancing target generation, with multiple high-grade zones identified through detailed mapping and sampling. The project’s geological setting within Nevada’s prolific Walker Lane tectonic zone supports a district-scale Carlin-type gold deposit model, with mineralisation hosted in highly altered limestone and controlled by fault and breccia structures.
Carlin-Type Deposit Model Underpins Exploration Strategy
Mammoth Minerals’ exploration approach is guided by a robust understanding of Carlin-type gold deposit formation. The recent diamond drilling and geophysical surveys at Buster confirm the presence of broad, structurally controlled mineralised corridors with intense alteration and jasperoid development. These features indicate significant hydrothermal fluid flow from intrusive sources, which likely drove the deposition of microscopic gold within pyrite in the limestone host rocks.
The discovery of a new mineralised horizon at Lunchbox Ridge, interpreted as a feeder structure, validates the model and opens multiple avenues for further drilling. The company plans to continue in-fill and extensional drilling to fully evaluate the scale and grade continuity of these zones.
Outlook and Next Steps for Mammoth Minerals
With drilling underway across priority targets at Blue Dick and Buster, Mammoth Minerals is positioning itself to unlock significant value from the Excelsior Project. The ongoing RC program, combined with extensive field mapping and sampling, aims to build a comprehensive pipeline of high-confidence targets. The company anticipates further assay results in the coming months, which will be pivotal in refining the mineral resource estimates and advancing towards feasibility studies.
Managing Director Glenn Poole emphasised the significance of these results, noting that the newly discovered mineralised horizon remains open in multiple directions and that the broader project area continues to deliver bonanza-grade results from surface sampling. The strategic location in Nevada, a top-ranked mining jurisdiction, further enhances the project's appeal amid global supply concerns for precious and critical minerals.
Investors and market watchers will be keen to see how these developments translate into resource upgrades and what impact they may have on Mammoth Minerals’ valuation and exploration momentum in the competitive Nevada gold sector. The unfolding story at Excelsior underscores the potential of Carlin-type systems to surprise and expand with diligent exploration.
Bottom Line?
Mammoth Minerals’ latest drilling at Excelsior redefines the Buster Trend’s gold potential and signals a promising runway of high-grade targets, but true widths and resource extents await further drilling clarity.
Questions in the middle?
- How will upcoming assay results from the remaining Blue Dick drill holes influence the project's resource model?
- Can Mammoth Minerals confirm the true width and continuity of the newly discovered parallel gold zone at Buster?
- What are the implications of the expanding Kentucky trend for Mammoth’s broader Nevada exploration strategy?