Gateway Mining Confirms Large-Scale Gold-Silver System at Great Western

Aircore Drilling Uncovers Extensive Gold-Silver System

Gateway Mining Limited (ASX:GML) has unveiled compelling initial results from its maiden aircore drilling campaign at the Great Western prospect within the Yandal Gold Project, Western Australia. The drilling has delineated a substantial ~4km long gold-mineralised doleritic unit along the Great Western flexure zone, confirming a major structural corridor hosting gold mineralisation.

Most gold intercepts were detected at the bottom of holes (BOH), a consequence of intense silicification and a lack of regolith development. This means the shallow aircore drilling has only scratched the surface of a much larger hydrothermal system, which the company now traces over an impressive ~10km strike length.

Unexpected High-Grade Silver Anomalism Expands the System

Beyond gold, Gateway’s drilling has revealed a striking geochemical zonation: a gold-rich core surrounded by significant silver anomalism extending outwardly. High-grade silver intercepts include standout results such as 1m at 89g/t Ag, 1m at 78g/t Ag, and 1m at 72g/t Ag, recorded near the bottom of holes. These are the highest silver grades recorded to date within Archaean lithologies at the Yandal Project.

Only the last metre of each hole was assayed for multi-element analysis, suggesting the silver mineralisation could extend further up-hole. Re-assaying is underway to better define the silver footprint. The presence of high-grade silver in the Eastern Goldfields is rare without a substantial hydrothermal driver, indicating a robust plumbing system beneath Great Western.

Structural Analogies to Major Eastern Goldfields Deposits

The gold-silver distribution and structural setting at Great Western echo significant dolerite-hosted deposits in the region, notably the Golden Mile. Here, gold concentrates in ductile, intensely sheared dolerite margins; hotter zones of the system; while silver appears in more brittle, distal zones with cross-cutting structures and competency contrasts.

Gateway’s CEO Richard Pugh highlighted the significance of the zonation pattern, describing silver as a "vertical vector" pointing towards primary gold mineralisation at depth. The discovery of extensive gold nuggets within the silver corridors further supports the interpretation of a multi-pulse epithermal system, with surface nuggets reflecting deeper hydrothermal activity.

Next Phase: Targeted RC Drilling to Test Depth Extensions

Building on the aircore success, Gateway is mobilising a reverse circulation (RC) rig to site this week, with plans to add a second rig early next quarter. The RC program will focus on testing the dolerite contact and vertical extensions beneath the silver anomalism, aiming to penetrate fresh rock and better define the primary gold mineralisation.

With $15.7 million in cash and $5.6 million in liquid ASX securities as of March 2026, Gateway is well funded to execute this next phase of exploration. The company anticipates rapid assay turnarounds (~2 weeks), enabling swift progress updates.