High-Grade Replacement Sedex Discovery Highlights Significant Potential Along New 1.2 km Trend at InZinc's Indy Sedex Project, Central BC

Vancouver, British Columbia--(Newsfile Corp. - March 11, 2026) - InZinc Mining Ltd. (TSXV: IZN) ("InZinc" or the "Company") announces recently reported very high-grade discoveries at the B-9 Zone (see NR25-09) are now recognised as replacement Sedex mineralization (B-9 Apex Zone) and are integral to the B-9 trend now totalling 2.2 km in length, of which 1.2 km remains untested. Near-surface primary mineralization, new replacement mineralization and along-strike prospects multiply the already significant discoveries achieved at the 100% owned Indy Sedex zinc-lead-silver-gallium-barite project, located 90 km southeast of Prince George in central BC, Canada.

"The addition of the high-grade B-9 Apex replacement zone is an exciting enhancement to the discovery potential at Indy. Replacement is a mineralizing process recognised at the world's richest Sedex deposits, most notably the Red Dog mine in Alaska, where it contributes to very high-grades and giant-sized deposits," remarked Wayne Hubert, CEO of InZinc. "Recognition of replacement style mineralization substantially improves our outlook for size, grade and potential for additional discoveries at the expansive and easily accessible Indy project in central BC."

Drilling in late 2025 discovered the B-9 Apex Zone, including a very high-grade intersection containing 20.1% Zn, 1.7% Pb and 9.5 g/t Ag over 3.2 m (see NR25-09) within a broader mineralized and altered envelope 58 m wide (Figures 1 and 2). This mineralization is recognised as replacement Sedex mineralization. Identifying replacement mineralization is crucial in Sedex deposits as it signifies potential for increased metal grades, enlarged zones and distribution of economic minerals into multiple rock layers.

Both primary and replacement Sedex mineralization are now recognised across the 1000 m drill-defined B-9 Zone. Untested, coincident geophysical and geochemical anomalies continue for at least 1200 m along strike from the Apex Zone (Figure 3) for a total potential length of the B-9 trend of 2.2 km. Drill permits are approved and planning for 2026 drilling is well underway.

Figure 1: Vertical Longitudinal Section - Highlighted Drill Intersections

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About Replacement Sedex Mineralization

Sedex deposits are the largest global producers of zinc with important by-products such as silver and critical metals. There are a limited number of areas in the world prospective for Sedex deposits. Primary Sedex mineralization, sometimes termed "shale hosted" or "exhalative", formed as layers on the ancient seafloor. Replacement Sedex mineralization formed, almost synchronously, below the seafloor allowing mineralization to extend into receptive surrounding rock layers (Figure 4).