Drilling at Mount Polley cuts 11.0 meters intersecting 4.43% copper, 1.53 g/t gold and 41.7 g/t silver

Imperial Metals Corporation (“Imperial” or the “Company”) (TSX:III,OTC:IPMLF) reports the first diamond drill hole of the Mount Polley 2025 Phase 2 Diamond Drill Program, which includes 11.0 meters grading 4.43% copper, 1.53g gold and 41.7g silver. The nine-hole Phase 2 program consisted of 3,718.3 yards.

The Mount Polley 2025 Phase 2 program had three goals; to test a high-grade zone beneath the Wight Pit (see Figure 1), to extend and define the boundaries for mineralization in the higher gold grade found at depth in the C2 zone, and to test beneath the previously mined Bell Pit for depth extension using new targeting techniques successfully deployed at the Springer Pit. Results from the first hole drilled in this program have been received and the remainder are still pending.

Figure 1: Wight Pit drilling plan

Drill hole WB-25-268 was secured to the eastern edge of the previously mined Wight Pit and targeted a high-grade area in the Green Zone, adjacent to the Martel Zone, at depth below the Wight Pit (see Figure 2). The purpose of drill hole WB-25-268 was to test continuity and further define the high-grade zone originally defined by holes WB-05-189 (15.0 meters grading 3.1% copper, 0.33 g/ton gold and 20.1 g/ton silver) and WB-04-179 (12.4 meters grading 6.7% copper, 3.65 g/t gold and 44.8 g/t silver).

Figure 2: Cross section of the Wight Pit drill

Hole WB-25-268 intercepted a hydrothermal fragmental potassium-amended breccia containing significant bornite and chalcopyrite cement at the target depth returning from 304.4 metres, 11.0 meters grading 4.43% copper, 1.53 g/t gold and 41.7 g/t silver. In addition to the mineralization intercepted in the target zone, the hole intersected a number of other higher grade sections both above and below the target zone, including 9.6 meters grading 3.71% copper, 0.42 g/t gold and 9.89 g/t silver, starting at 272.5 metres.

Table 1. Drill results of WB-25-268

The higher silver to copper ratio returning to this hole is typical of the mineralization in the northeast quadrant of the Mount Polley property. Additional diamond drilling will focus on this area in 2026.

The Torture Zone has previously been defined as an underground resource (see Table 2).

Table 2. Torture zone Underground source

* source Imperial 2024 AIF (March 31, 2025)

Jim Miller-Tait, P.Geo., Imperial’s VP Exploration, has reviewed this press release as the designated qualified individual as defined by National Instrument 43-101 for the Mount Polley exploration program. The reported samples were analyzed at Activation Laboratories Ltd. in Kamloops. A full QA/QC program was carried out on all diamond core samples sent to the laboratories, using blanks, standards and duplicates. The significant test intervals reported represent apparent widths. Insufficient geological information is available to confirm the geological model and the true width of significant test intervals.

About roof rack

Imperial is a Vancouver-based exploration, mine development and operating company whose assets include the Mount Polley Mine (100%), the Huckleberry Mine (100%) and the Red Chris Mine (30%). Imperial also has a portfolio of 23 exploration properties in British Columbia.

Company contacts

Brian Kynoch | President | 604.669.8959
Jim Miller Tait | VP exploration | jim.miller-tait@imperialmetals.com

Cautionary Statement Regarding Forward-Looking Statements

Certain information in this press release are not statements of historical fact and are “forward-looking” statements. Forward-looking statements relate to future events or future performance and reflect the expectations or beliefs of the Company’s management regarding future events and include, but are not limited to, statements regarding the Company’s expectations regarding exploration drilling programs at Mount Polley; potential quantity and/or quality of minerals and the potential size of the mineralized zone. In certain cases, forward-looking statements can be identified by the use of words such as “plans”, “expects” or “does not expect”, “is expected”, “outlook”, “budget”, “scheduled”, “estimates”, “predicts”, “intends”, “anticipates” or “does not expect”, or “believes”, or variations of such words and phrases or statements that certain actions, events or results “may”, “could”, ‘could’, ‘could’ or ‘will’. are taken,” “occur” or “are achieved” or the negative of these terms or similar terminology. By their nature, forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause the actual results, performance or achievements of the Company to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements.

In making the forward-looking statements in this press release, the Company has applied certain factors and assumptions that are based on information currently available to the Company as well as the Company’s current beliefs and assumptions. These factors and assumptions and beliefs and assumptions include the risk factors described from time to time in the Company’s annual information form, its interim and annual financial statements and management’s discussion and analysis of these statements, all of which are maintained and available for review on SEDAR+ at www.sedarplus.com. Although the Company has attempted to identify important factors that could cause actual actions, events or results to differ materially from those described in forward-looking statements, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended, many of which are beyond the Company’s ability to control or predict. There can be no assurance that forward-looking statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements and all forward-looking statements in this press release are qualified by these cautionary statements.

Figures accompanying this announcement are available at:

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