Multiple Mineralized Skarn Horizons Intersected at the Birch Copper-GOLD Project
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MULTIPLE MINERALIZED SKARN HORIZONS INTERSECTED
AT THE BIRCH COPPER-GOLD PROJECT
September 3, 2025 – Vancouver, British Columbia – Yukon Metals Corp. (CSE: YMC,
FSE: E770, OTCQB: YMMCF) (“Yukon Metals” or the “Company) is pleased to provide an
update from its exploration activities on its 100% -owned 7,000 -hectare Birch Property
(“Birch”), located 65 kilometres northeast of Burwash Landing, Yukon, and 200 kilometres
northwest of Whitehorse. The 2025 drill program is well underway and has achieved its
initial objective of intersecting skarn horizons thought to be responsible for a 1.4 -
kilometre-long gold and copper in soil anomaly grading up to 0.99 g/t Au and 0.24%
Cu, as well as surface rock samples up to 14.1 g/t Au and 2.42% Cu (YMC News Release
- October 16, 2024).
Highlights:
• A total of 1, 100 metr es of diamond drilling has been completed across three pad
locations down to depths of up to 400 metres (Figure 7), with all holes intersecting
mineralized skarn horizons; assay results are pending.
• Near surface mineralization beginning at ~25 metres, and interval widths up to 46
metres in drill core, includes a thick, continuous interval of intensely skarn
altered rock from 256.5 to 302.5 metres: true thicknesses currently unknown.
• The mineralization style suggests the potential for a large, multistage skarn
system developed along the marble–schist contacts and intrusive margins.
"Multiple zones of mineralization have been encountered from near surface and substantially
at depth. These early results suggest the Birch system has both scale and continuity,
and we look forward to receiving assays to help guide the next steps of exploration,” said
Rory Quinn, President and CEO of Yukon Metals.
The ongoing diamond drill program at Birch is testing a 1.4 -kilometre long and up to 400 -
metre-wide area of anomalous gold and copper in soil values coincident with mapped
limestone, schist horizons, and cross-cutting felsic intrusions.
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The 2025 drill program has intersected multiple zones of retrograde skarn mineralization
overprinting prograde skarn development with zones of massive garnet. Other rock types
include prominent marble units, and multiple phases of cross -cutting intrusive d ykes. The
thickness of the mineralized zones in drill core, defined by the extent of prograde skarn with
pyrrhotite and chalcopyrite present, ranges from 0.2 to 46 metres.
The initial three drill holes at Birch intersected a similar package of interbedded schist,
marble, and intrusive dykes that are variably altered:
Hole BR25-001 intersected multiple shallow mineralized horizons, including silicified schist
with minor disseminated and vein-hosted pyrrhotite beginning around 60-metre depth, and
a broader zone of stronger skarn horizon between 135 to 157 metres with chalcopyrite
appearing alongside pyrrhotite in disseminated, vein, and semi-massive textures (Figure 1).
Figure 1 – Hole BR25-001 at 149m. (A) Closeup of massive pyrrhotite > chalcopyrite within
skarn horizon. (B) Mineralization within the skarn unit consists of zones of massive sulphides as
well as less intense foliaform chalcopyrite.
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Hole BR25-002, drilled steeper from the same pad, intersected mineralization as shallow as
50 metres within chlorite–amphibole skarn, continuing through multiple variably mineralized
skarn horizons in many cases in association with intrusive contacts. A strongly pyrrho tite-
chalcopyrite-pyrite mineralized skarn horizon occurs at 125 metres on the top contact of a
granodiorite dyke (Figure 2).
Figure 2 - Hole BR25-002 at 125m. (A) Closeup of massive pyrrhotite > chalcopyrite in skarn zone
approaching contact with a thick granodiorite dyke. (B) Mineral assemblage appears to be
dominantly chlorite-quartz with zones of massive and clustered sulfide Pyrrhotite > Chalcopyrite,
changing to chalcopyrite dominant downhole.
Further downhole it occurs on the bottom contact of a feldspar porphyry dyke unit with
chalcopyrite and pyrrhotite (Figure 3).
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Figure 3 – Hole BR25-002 at 140m. Mineralized skarn horizon with chalcopyrite > pyrrhotite
following a feldspar porphyry dyke unit.
Hole BR25-003, a 250-metre step-out to the east, encountered near-surface mineralization
beginning at ~25 metres within skarn along the schist–marble contact (Figure 4) as well as
a thick, continuous interval of intensely skarn altered rock from 256.5 to 302.5 metres.
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Figure 4 - Hole BR25-003 at 27m, near-surface, strongly developed skarn interval with minor
garnet rich horizons and retrograde chlorite-amphibole overprint. Intense massive-mottled
Pyrrhotite > Chalcopyrite over ~80cm along contact with marble.
Figure 5 – Hole BR25-003 at 256m. Thick Interval of intensely skarn altered rock with frequent
patchy pyrrhotite (Po) +/- chalcopyrite (Cpy) +/- sphalerite. Follows a porphyritic dyke unit with
sparse disseminated pyrrhotite.
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In addition to skarn-hosted sulfides, BR25 -001 and BR25 -002 also intersected zones of
sheeted quartz -calcite veining above the main skarn horizons (Figure 6), suggesting a
broader hydrothermal footprint to the mineralizing system.
Preliminary observations of the drilling show that mineralization is present near surface at
shallow depths (~25 -metres to 60-metres) as well as in laterally extensive skarn
horizons exceeding 20-metres to 40-metres in thickness at depth.
This mineralization style suggests the potential for a large, multistage skarn system
developed along the marble–schist contacts and intrusive margins.
Figure 6 – Hole BR25-001 at 40m. Sheeted quartz-calcite veins cutting through silicified schist
unit.
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Figure 7 - 2025 Drilling Locations at Birch Property.
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Figure 8 - Map of 2025 planned exploration work at Birch Property.
About the Birch Project
Yukon Metals owns 100% of the helicopter -accessed Birch project located 65 kilometres
northeast of the community of Burwash Landing. The Birch project area is dominated by frost-
heaved boulders in unglaciated terrain, with outcrop present on steeper ridges. The project
lies predominantly within the Finlayson assemblage of the Yukon-Tanana Terrane, consisting
of variably carbonaceous schist and quartzite, marble, garnet amphibolite and rare
metaplutonic rocks.
The Yukon-Tanana Terrane structurally overlies the Ruby Range Batholith which is regionally
mapped in the northeastern portion of the property occurring as Ruby Range quartz -feldspar
porphyry and Rhyolite Creek porphyry and intermediate and felsic volcanic rock (Israel et. Al.,
2011). Project-level mapping indicates the geology of the area is comprised of schists and
marble units, moderately to strongly oxidised felsic intrusive, and patchy oxidised porphyritic
rhyolite dykes.