Discovery of Copper Mineralization in 400 Metre Step-Out Drill Hole, Four Kilometres North of the Mount Polley Mill
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News Release
Discovery of Copper Mineralization in 400 Metre Step-Out Drill Hole, Four Kilometres North of the
Mount Polley Mill
Vancouver | August 12, 2025 | Imperial Metals Corporation (“Imperial” or the “Company”) (TSX:III) reports that
an exploration drill hole, drilling a blind target through clastic cover rocks, intercepted a hydrothermal breccia
hosting significant visual native copper at the unconformity with the Mount Polley Intrusive Complex (MPIC).
Two intercepts in diamond drill hole FP-25-01 of 7.0 metres grading 0.70% copper and 0.27 g/t gold starting
at 383.0 metres, and 20.0 metres grading 0.25% copper and 0.96 g/t gold starting at 417.5 metres, mark the
discovery of significant mineralization in a major step-out. The drill hole was collared 4.15 kilometres north
of the operating Mount Polley mill (see Figure 1).
Hole ID From (m) To (m) Width (m) Copper (%) Gold (g/t)
Copper
Oxide
Ratio(% )*
FP-25-01 383.0 390.0 7.0 0.70 0.27 9%
and 417.5 437.5 20.0 0.25 0.96 9%
*Copper Oxide Ratio % = (CuOx%/Total Cu%)*100
Hole FP-25-01 was drilled 1.2 kilometres north-northwest from the previously mined Wight Pit (Northeast
Zone) where some of the highest copper grade ore has been mined at Mount Polley. FP-25-01 was oriented
at an azimuth of 210 with a dip of -60 and collared into a conglomerate unit that lies over the MPIC (see
Figure 2). The blind target was generated through interpretation of a structural corridor that extends north-
northwest from the Northeast Zone and coincides with two geophysical anomal ies. Geophysical surveys
overlapping the structural corridor reveal a 3-Dimensional Induced Polarization chargeability response and
overlapping magnetic high. Drilling through the post-MPIC cover conglomerate unit intersected an
unconformable contact with the MPIC at 378.9 metres down hole (348 metres vertical depth from surface).
The rock below 378.9 metres consisted of brecciated and carbonate healed MPIC monzonite -monzodiorite
with native copper until 414.7 metres. This was followed by additional hydrothermal breccia displaying strong
magnetite alteration and good chalcopyrite mineralization until 437.5 metres. The magnetite-rich breccia
continued to 590 metres down hole.
The mineralization encountered in FP-25-01 is significant for the following reasons:
• Intercept is 390 metres away from the nearest known mineralized hit.
• The dominance of native copper in this intercept is unique and opens up the question of whether
other, similar style mineralization is in the area.
• The high gold-copper ratio in the lower intercept starting at 417.5 metres, is distinctly different from
metal ratios observed in other zones in this part of the property.
• The series of mineralized zones that occur along the interpreted structural corridor occur over a
linear distance of over 1,500 metres. The link between mineralization and the structure will be
further investigated.
• The extent of non -copper-gold bearing magnetite breccia below 437.5 metres is a clear sign of
extensive hydrothermal activity well north of the exposed MPIC and provides support for further
exploration targeting in the surrounding area.
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Figure 1: Location Plan Map showing the area of Boundary Zone and Wight Pit relative to the new diamond
drill hole FP-25-01. Also shown is the section line A – A’ which controls the location of Figure 2.
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Drilling continued after the drill results reported in the May 22, 2025 News Release with 16 additional drill
holes designed to aid in expanding the resource in the gold -rich C2 Zone, and 2 holes in the pit to provide
detailed information to support mine planning. D iamond drilling at Mount Polley has been suspended for
now.
Figure 2 – Section A – A’ showing the interpreted geology and closest Company drilling to the location of FP-
25-01. Looking West
Jim Miller-Tait, P.Geo., Imperial’s VP Exploration, has reviewed this news release as the designated Qualified
Person as defined by National Instrument 43 -101 for the Mount Polley exploration program. Samples
reported were analyzed at Activation Laboratories Ltd. located in Kamloops. Due to the presence of native
copper selected samples were analyzed by copper metallic screen method. A full QA/QC program using
blanks, standards and duplicates was completed for all diamond drilling samples submitted to the labs.
Significant assay intervals reported represent apparent widths. Insufficient geological information is available
to confirm the geological model and true width of significant assay intervals.
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About Imperial
Imperial is a Vancouver based exploration, mine development and operating company with holdings that include the
Mount Polley mine (100%), the Huckleberry mine (100%), and the Red Chris mine (30%). Imperial also holds a portfolio
of 23 exploration properties in British Columbia.
Company Contacts
Brian Kynoch | President | 604.669.8959
Jim Miller-Tait | VP Exploration | [email protected]
imperialmetals.com
Cautionary Note Regarding Forward-Looking Statements
Certain information contained in this news 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 Company’s management’s expectations
or beliefs regarding future events and include, but are not limited to, statements regarding the Company’s expectations with
respect to current and planned exploration drilling programs at Mount Polley and timing thereof, specifically with respect to the
future plans to investigate the new mineralization encountered in FP-25-01 and the potential link to a structural corridor that
extends north-northwest from the Northeast Zone; the potential for mineralization to be converted from resource to reserve; the
potential for extension of mine life; and the impact of drilling on future pit designs and mine life schedule. In certain cases, forward-
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achievements of the Company to be materially different from any future results, performance or achievements expressed or
implied by the forward-looking statements.
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