Mammoth Minerals Hits 10.67m at 3.76g/t Gold Opening Fresh Parallel Zone at Buster
Key Takeaways
- Mammoth Minerals has intersected a new parallel high-grade gold zone at Lunchbox Ridge — 10.67m @ 3.76g/t Au including 4.6m @ 6.86g/t Au — on virgin ground over 700m along strike from historical Buster underground workings.
- Multiple supporting holes confirm the system across different depths and horizons, with MEXRC2635 returning 22.9m @ 1.37g/t Au and MEXRC2634 delivering two separate intercepts at 12.2m @ 1.57g/t and 10.7m @ 1.09g/t.
- The newly identified Lunchbox Ridge zone remains open along strike and down-dip, with in-fill and extensional drilling underway to define the next steps across the broader Buster Gold Zone.
- Bonanza-grade rock chip results across Blue Dick (up to 1,692g/t Ag, 21.5g/t Au) and Kentucky Trend (up to 3,877g/t Ag, 2.3g/t Au) open multiple additional drill-ready targets across a 6.5km mapped strike system.
- The Blue Dick drill program has 20 of 29 planned holes still to come, with multiple assays at the lab — delivering a sustained pipeline of upcoming catalysts across the Excelsior Gold-Silver Project.
New high-grade gold zone opens fresh target horizon at Buster Trend
Mammoth Minerals (ASX: M79) has intersected a new parallel high-grade gold zone at Lunchbox Ridge, along the Buster Trend at its Excelsior Gold-Silver Project, Nevada. The headline intercept — 10.67m @ 3.76g/t Au from 198.2m, including 4.6m @ 6.86g/t Au from 199.7m (hole MEXRC2637) — sits on a parallel structure untested by historical drilling, located over 700m along strike from the historical Buster UG workings. The zone remains open along strike and down-dip. This is a discovery on virgin ground, redefining the scale potential of the corridor without needing to re-drill known areas.
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The numbers behind the Buster Trend breakthrough
The latest drilling intercept, 10.67m @ 3.76g/t Au from 198.2m in MEXRC2637, establishes Lunchbox Ridge as a new parallel high-grade zone within the Buster corridor. The intercept included a higher-grade core of 4.6m @ 6.86g/t Au from 199.7m. Supporting holes delivered consistent high grades across multiple horizons. MEXRC2635 intersected 22.9m @ 1.37g/t Au from 10.7m, including 3.0m @ 4.15g/t Au from 22.9m. MEXRC2634 returned 12.2m @ 1.57g/t Au from 32m, including 4.6m @ 3.31g/t Au from 38.1m, and deeper in the same hole, 10.7m @ 1.09g/t Au from 164.6m, including 3.0m @ 2.2g/t Au from 167.7m. MEXRC2636 added 3.0m @ 0.53g/t Au from 7.6m.
The shallow trend defined in MEXRC2634–2636 offers an opportunity to rapidly add to the mineral inventory. The mineralisation is described as a shallow-dipping horizon over 10m thick with higher-grade central zones interpreted as a potential feeder pathway.
Latest and supporting drill intercepts
| Hole | Intercept | Grade (g/t Au) | From (m) | Notes |
|---|---|---|---|---|
| MEXRC2637 | 10.67m | 3.76 | 198.2 | Incl. 4.6m @ 6.86g/t from 199.7m — new parallel zone |
| MEXRC2637 | 4.5m | 0.55 | 64.0 | Shallow intercept |
| MEXRC2635 | 22.9m | 1.37 | 10.7 | Incl. 3.0m @ 4.15g/t from 22.9m |
| MEXRC2634 | 12.2m | 1.57 | 32.0 | Incl. 4.6m @ 3.31g/t from 38.1m |
| MEXRC2634 | 10.7m | 1.09 | 164.6 | Incl. 3.0m @ 2.2g/t from 167.7m |
| MEXRC2636 | 3.0m | 0.53 | 7.6 | Shallow intercept |
Managing Director’s take
Glenn Poole, Managing Director
“This exciting high-grade result from step-out drilling along the Buster Trend has opened up a significant new target horizon, redefining the potential within the Buster Shear corridor. Lunchbox Ridge sits over 700m along strike from the historical Buster UG workings, indicating that scale potential continues to grow on multiple fronts — including mineralisation starting from surface.”
What Carlin-Type gold deposits are and why they matter here
Carlin-Type Gold Deposits need the right structural “plumbing” to form. That plumbing consists of faults, thrusts, and folds that act as pathways for superheated hydrothermal fluids. These fluids are driven by nearby intrusive heat sources and flow upward into permeable limestone host rocks. The fluids dissolve limestone and deposit microscopic gold within pyrite. Nevada’s Great Basin is the world’s premier Carlin-Type district. This deposit style sits behind Nevada’s largest gold mines. When you see a district-scale Carlin model, you are looking at scale potential well beyond a single intercept.
Why the evidence stacks up at Buster
Altered limestone and jasperoid were observed to the end of hole in the deepest diamond drilling (MEXDD006 at 227.7m). Faulting and breccia zones confirm the presence of large fault structures. The recently staked intrusion north of the Buster Fault zone is a possible fluid source. The system exhibits the structural feeder pathways and host rock characteristics consistent with Carlin-Type mineralisation.
Bonanza-grade surface hits widen the story
The wider Excelsior sampling campaign has delivered bonanza-grade gold and silver results across multiple trends. The Blue Dick Prospect spans over 6.5km of mapped strike, and the system is enriched in silver and critical minerals at a time when sovereign supply has become a key focus. Situated in Nevada, a consistently top-ranked mining jurisdiction, Blue Dick represents a prime opportunity to meet these demands.
Standout Blue Dick and Kentucky rock chip results
Blue Dick:
- 1,190g/t Ag, 4.7g/t Au — MREX01209
- 1,078g/t Ag, 11.8g/t Au, 1.1% Cu, 8.5% Pb, 15.3% Zn — MREX01194
- 1,692g/t Ag, 21.5g/t Ag — MREX01182
- 891g/t Ag, 10.7g/t Au — MREX01206
Kentucky Trend:
- 3,877g/t Ag, 2.3g/t Au, 1.45% Cu, 4.1% Pb — MREX01064
- 995g/t Ag, 4.3g/t Au — MREX01376
- 9.1g/t Au, 51.9g/t Ag — MREX01409
The Kentucky trend is a walk-up drill target not looked at in the modern era of mining. The grade tenor speaks for itself.
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Drilling underway and what comes next
The Blue Dick program has been designed to test four mapped trends across 29 holes for ~5,000m. Nine holes (1,800m) have been completed, with 20 planned. Multiple assays are at the lab. At Buster, further in-fill and extensional drilling is underway to establish the next steps across the broader Buster Gold Zone. The newly identified mineralisation remains open along strike and down-dip.
Wider Excelsior field work continues with regional rock chip and soil sampling, heli-magnetic geophysics interpretation, and continued drill-testing of drill-ready targets. The remainder of the year will see continued drilling and field programs across the Excelsior Claims, with management to keep shareholders updated.
A top-tier Nevada jurisdiction, a district-scale Carlin-type model, multiple open zones, and an active rig equal a steady stream of catalysts ahead.
Ready to Explore the Full Potential of Mammoth’s Excelsior Project?
The Lunchbox Ridge discovery at Buster Trend has delivered high-grade gold intercepts over 700m from historical workings, with bonanza-grade surface results across Blue Dick and Kentucky trends opening multiple expansion pathways. Mammoth Minerals is drilling a district-scale Carlin-type system in Nevada, with assays pending and 20 holes still to come.
Active drilling continues across the Excelsior Gold-Silver Project, targeting shallow and high-grade zones that remain open along strike and down-dip. To stay updated on drill results, upcoming assays, and strategic developments across this expanding Nevada gold system, visit the Mammoth Minerals investor centre for the latest project updates and investment details.