# Exceptional assays show why high-grade core stands to super-charge early production profile at FireFly's Green Bay *2026-07-01T21:57:40-04:00* Exceptional assays show why high-grade core stands to super-charge early production profile at FireFly’s Green Bay ## Latest assays such as 42m @ 6.1% CuEq and 9.8m @ 16.5% CuEq, which demonstrate the outstanding continuity of the high-grade zone, will feed into the impending economic studies **KEY POINTS** - **Drilling returns more exceptional results which extend the high-grade core zone and confirm the strong continuity of the mineralisation** - **Given the strength of the results, FireFly will incorporate them into an updated resource model underpinning the economic studies; This means these studies will now be completed in July-August 2026** - **The results, generated primarily from infill drilling, will be reflected in the Measured & Indicated Resource category; This category is central to the economic studies** - **The results are particularly important because they demonstrate the strong continuity and grade of the high-grade core zone, which will be a key input to the upcoming economic studies** - **The assays continue to demonstrate strong continuity of mineralisation across the upper copper-gold Volcanogenic Massive Sulphide (VMS) lenses, the footwall stringer-style copper zone and the rich high-grade core zone which lies between the two** - **Drilling in the +800m-long high-grade core zone has returned more continuous thick intersections including: ** - **42.0m @ 6.1% copper equivalent **(**CuEq**)1(4.7% Cu & 1.4g/t Au) _including a high-grade VMS zone of_**9.8m @ 16.5% CuEq **(12.7% Cu & 4.0g/t Au)_(**~ true thickness**) in _hole _MUG26-053_ - **51.5m @ 4.9% CuEq**(4.0% Cu & 0.9g/t Au) _including an upper zone grading _**17.0m @ 9.1% CuEq **(7.5% Cu & 1.7g/t Au) _(**~ true thickness**) _in hole _MUG26-054_ - **50.2m @ 4.0% CuEq**(3.5% Cu & 0.4g/t Au) in hole _MUG26-036_ - **34.4m @ 5.0% CuEq**(3.8% Cu & 1.2g/t Au) _including an upper zone grading _**14.3m @ 7.6% CuEq **(5.2% Cu & 2.5g/t Au) _(**~ true thickness**) _in hole _MUG26-028_ - **The high-grade core zone remains open with the deepest hole drilled to date returning 49.0m @ 6.1% CuEq **_(see ASX announcement dated 16 October 2025)._ - **The upper VMS zones also continue to deliver spectacular copper and gold intersections, including:** - **20.7m @ 7.7% CuEq ****(5.9% Cu & 1.9g/t Au)**in hole _MUG26-013__(**~ true thickness**)_ - **13.6m @ 6.8% CuEq ****(5.7% Cu & 1.1g/t Au)**in hole_MUG26-029__(**~ true thickness**)_ - **17.8m @ 6.7% CuEq ****(5.4% Cu & 1.4g/t Au)**in hole _MUG25-279__(**~ true thickness**)_ - **25.9m @ 6.4% CuEq ****(5.5% Cu & 1.0g/t Au)**in hole _MUG26-044__(**~ true thickness**)_ - **18.6m @ 6.1% CuEq ****(4.5% Cu & 1.7g/t Au)**in hole _MUG26-038__(**~ true thickness**)_ - **9.2m @ 6.1% CuEq ****(1.8% Cu & 4.9g/t Au)**in hole _MUG25-281__(**~ true thickness**)_ - **Significant intersections were also returned from close-spaced drilling in the footwall zone stringer-style mineralisation. These include:** - **35.7m @ 3.3% CuEq****(3.1% Cu & 0.2g/t Au)**in hole _MUG25-278 _(**~ true thickness**) - **25.3m @ 3.8% CuEq****(3.5% Cu & 0.3g/t Au) **in hole _MUG26-008 _(**~ true thickness**) - **43.5m @ 3.0% CuEq ****(2.6% Cu & 0.4g/t Au)**in hole _MUG25-285 _(**~ true thickness**) - **The current Green Bay Mineral Resource currently stands at 50.4Mt @ 2.0% CuEq in the Measured & Indicated (M&I) category and a further 29.3Mt @ 2.5% CuEq in the Inferred category **_(see ASX announcement dated 18 November 2025). _ - **The high-grade core zone contains 8.8Mt @ 3.9% CuEq of M&I, and an additional 10.9Mt @ 3.8% CuEq of Inferred, Mineral Resource **_(see ASX announcement dated 18 November 2025). _ - **Six rigs continue to operate underground at the Ming Mine** - **Regional exploration continues with drilling of geophysical targets; Maiden drilling has commenced at the Tilt Cove project ** - **The Company is well funded to achieve its growth objectives with ~A$219.9 million in cash and liquid investments as at 31 March 2026** ________________________________ 1Metal equivalent for drill results reported in this announcement have been calculated at a copper price of US$8,750/t, gold price of US$2,500/oz, silver price of US$25/oz and zinc price of US$2,500/t. Metallurgical recoveries have been set at 95% for copper, 85% for precious metals and 50% for zinc. CuEq(%) = Cu(%) + (Au(g/t) x 0.82190) + (Ag(g/t) x 0.0822) + (Zn(%) x 0.15038). In the opinion of the Company, all elements included in the metal equivalent calculation have a reasonable potential to be recovered and sold based on current market conditions, metallurgical test work, and historical performance achieved at the Green Bay project whilst in operation. | | **FireFly Managing Director Steve Parsons said: “These are exceptional results with extremely high grades over substantial widths. They also demonstrate the strong continuity of