Miramar Reports High-Grade Copper-Lead-Silver Results at Chain Pool

13 July 2026 | Western Australia - Miramar Resources has reported further high-grade copper-lead-silver rock chip results from the Joy Helen prospect, part of its 100%-owned Chain Pool Project in Western Australia’s Gascoyne region.

The latest results were collected during a recent auger drilling campaign and continue to support the company’s view that Joy Helen may have similarities to Sedimentary Exhalative, or SEDEX-style, base metal systems.

Recent rock chip results include:

• 6.28% copper, 15.5% lead and 16.7 g/t silver
• 2.89% copper, 46.5% lead and 33.0 g/t silver
• 6.72% copper, 47.8% lead and 47.7 g/t silver

Managing Director Marion Bush said Chain Pool has the key ingredients for a large base metal deposit, including favourable age, geology and structural setting, along with evidence of high-grade copper-lead-silver mineralisation at Joy Helen.

Why it matters: Joy Helen is still early stage, but the grades reported from surface sampling are strong and point to a potentially larger opportunity than the historical workings alone suggest.

Two samples were collected almost 200m east of the historic workings, close to an interpreted basin-margin fault highlighted in recent gravity work and near a copper-in-soil anomaly.

One sample, MR0013, returned strongly anomalous barium of 5,790ppm. Miramar said high barium values can occur in halos around large SEDEX deposits such as Mount Isa and Abra, and may indicate potential for additional mineralisation away from the main Joy Helen workings.

The company is awaiting results from recently completed auger drilling, expected in mid-July. Once received, Miramar plans to finalise further work including passive seismic surveying to map basement topography and faulting, followed by its first dedicated bedrock drilling campaign at the project.

Miramar also said it is reviewing drilling data from its Gidji JV Gold Project near Kalgoorlie, with a view to assessing shallow gold resource potential and possible development options.

For Western Australia’s base metals sector, Chain Pool adds another early-stage copper-lead-silver target with high-grade surface mineralisation and potential scale upside from geophysics and planned drilling.

Source: Miramar Resources ASX announcement, “High-Grade Copper-Lead-Silver Results from Chain Pool”, 13 July 2026.