Buxton Resources Chips 6.21% Copper at Arizona Project Secured for US$11,000

Buxton’s new Arizona copper play delivers rock chips up to 6.21% Cu and 1,355 g/t Ag

Buxton Resources has announced surface rock chip results from its newly acquired Arivaca Project in Arizona, with separate samples returning up to 6.21% Cu and 1,355 g/t Ag. This represents Buxton’s first new Arizona project since completion of the Copper Wolf Asset Sale Agreement with IGO. The company has secured 14.2 km² of newly granted tenure, 100%-owned, acquired at a pegging cost of approximately US$11,000. Arivaca sits within southern Arizona’s Laramide porphyry belt, roughly 30 km southwest of Freeport-McMoRan’s Sierrita copper-molybdenum mining complex. High-grade surface hits combined with ultra-low entry cost create an attractive early-stage risk/reward proposition for self-directed investors tracking ASX-listed explorers with North American exposure.

Inside the Arivaca rock chip results

The standout combined result came from sample AV031RC, which returned 0.69% Cu and 84.3 g/t Ag in the same sample — the best in-situ result reported. This sample came from subcrop rather than mine dumps, indicating primary mineralisation at surface. Mine dump samples delivered the highest individual grades: 6.21% Cu (sample AV033RC), 3.55% Cu (sample AV002RC), and 1.1% Cu (sample AV011RC). Multiple samples exceeded 400 g/t Ag, with sample AV011RC returning 1,355 g/t Ag. Additional metals included gold up to 0.55 g/t (sample AV011RC), plus elevated lead, zinc, arsenic and antimony. The highest-grade samples were collected from dumps adjacent to historic mine workings (small hand-dug pits) within zones of quartz veining and brecciation, while the broader 35-sample program comprised a mix of mine dump, outcrop, subcrop, and float sample types.

Photographed samples (Figure 5 in source announcement):

• Sample A (AV030RC): 0.47% Cu & 9.2 g/t Ag
• Sample B (AV031RC): 0.69% Cu & 84.3 g/t Ag
• Sample C (AV032RC): 0.47% Cu & 114 g/t Ag (mine dump)
• Sample D (AV003RC): 0.86% Cu & 429 g/t Ag (mine dump)

What makes a porphyry system — and why the signs point downward at Arivaca

A porphyry copper system refers to a large, disseminated copper deposit formed when metal-rich fluids are expelled from a cooling magma chamber deep underground. As these fluids rise through fractures in overlying rock, they deposit copper (often with molybdenum, gold and silver) in a broad, low-grade but high-tonnage zone. Porphyry deposits supply roughly 60% of global copper production and include some of the world’s largest mining operations. The key characteristic is that the highest-value mineralisation typically sits at depth, beneath an upper zone of alteration and veining that acts as a surface signature.

At Arivaca, the surface veining, alteration and geochemistry are interpreted as consistent with the upper parts of a porphyry system. The wallrock adjacent to historic workings exhibits argillic (clay-rich) to propylitic (chlorite-epidote) alteration, both of which form in the shallower portions of porphyry systems as hot fluids interact with cooler rock. The company’s interpretation is that the target — the core zone of disseminated copper mineralisation — sits at depth below the current surface exposure. A semi-coincident magnetic low identified in airborne magnetics may indicate a deeper felsic intrusion (a body of granite-like rock), which typically underlies porphyry systems and acts as the heat and metal source.

Pathfinder elements provide additional evidence of structural level. Pathfinders are trace elements whose distribution patterns help geologists determine how deep into a system the current erosion level sits. At Arivaca, median values for antimony (Sb), lithium (Li), lead (Pb), bismuth (Bi) and thallium (Tl) align with the shallow sericitic to upper argillic zone (see Table 1 in source announcement). In plain terms, these elements tell you the surface sits “above” the main porphyry target, not within it. The company’s technical framework references Halley et al. (2015), a widely used industry guide to porphyry geochemical zonation.

Marty Moloney, CEO

“Arivaca is exactly the kind of opportunity Buxton is pursuing in Arizona — 100%-owned, acquired at low cost, with high-grade surface mineralisation in an underexplored setting within the proven Laramide porphyry belt. The geochemistry, veining, alteration and magnetics all point to potential for a porphyry-style mineral system at depth at Arivaca. We’re looking forward to commencing detailed mapping and geophysics ahead of our first drill program.”

Reference to Freeport-McMoRan’s Sierrita mine (located approximately 30 km northeast of Arivaca) is provided for regional geological context only and should not be taken to imply that mineralisation of similar style, grade or scale occurs within the Arivaca Project tenure. The Laramide porphyry belt hosts multiple deposits, each with its own characteristics. It is also important to note that no modern drilling or systematic exploration is known within the Arivaca tenure, despite the district’s 19th-century mining history and over 100 recorded historic workings across the wider Las Guijas mining district. Buxton aims to test whether these historic workings reflect polymetallic veining related to a more extensive porphyry system at depth.

The investment case and what comes next

Buxton’s Arivaca acquisition delivers several characteristics that appeal to self-directed investors tracking early-stage exploration plays:

• 100%-owned with no joint venture dilution
• Ultra-low acquisition cost: approximately US$11,000 in application and two-year rent fees
• Modest ongoing commitment: approximately US$35,000 per annum for expenditure obligations in years 1–3
• High-grade surface mineralisation in multiple rock chip samples
• Untested porphyry target at depth, with surface geochemistry and magnetics supporting the conceptual model

Arivaca forms part of Buxton’s broader Arizona portfolio, which spans multiple projects across the Laramide porphyry belt (see Figure 2 in source announcement). The company has submitted Geological Field Operations Plans (GFOPs) to the Arizona State Lands Department to permit three phases of work:

1. Detailed mapping and surface sampling
2. Detailed airborne magnetics
3. Drill testing

Tenure & cost summary:

• 8 Mineral Exploration Permits
• ~14.2 km² total area
• ~US$11,000 acquisition cost (application + two-year rent)
• ~US$35,000 p.a. expenditure commitment (years 1–3)

The pathway to a maiden drill program now depends on permit approvals from the Arizona State Lands Department. For investors, the next catalyst to watch is the granting of GFOPs, which would enable Buxton to commence fieldwork and move toward drill testing. If the surface signature correctly predicts a porphyry system at depth, drill intersections could materially re-rate the project’s value. If the system is not present or not economic, the low sunk cost limits downside exposure. The risk/reward asymmetry — high-grade surface results, minimal capital deployed, and a clear pathway to drill testing — is what makes reconnaissance-stage porphyry exploration attractive at this entry point.

Don’t Miss the Next Arizona Copper Discovery

Join 30,000+ investors getting FREE breaking ASX mining news delivered to your inbox within minutes of release, complete with expert analysis. Click the “Free Alerts” button at Discovery Alert to receive real-time alerts the moment market-moving announcements hit the ASX.