Midnight Sun Confirms Dumbwa System With Initial Copper Intercepts Initial Dumbwa intercepts include 39.7m of 0.51% Cu including 7.0m of 1.13% Cu and 25.9m of 0.48% Cu
Midnight Sun Confirms Dumbwa System With Initial
Copper Intercepts
Initial Dumbwa intercepts include 39.7m of 0.51% Cu including 7.0m of
1.13% Cu and 25.9m of 0.48% Cu
Vancouver, British Columbia, October 1st, 2025 – Midnight Sun Mining Corp. (TSXV: MMA
/ OTC: MDNGF) (“Midnight Sun” or the “Company”) is pleased to announce initial intercepts
within the Dumbwa Target, which feature significant copper mineralization such as 0.51% Cu
over 39.7 metres (“m”) including 1. 13% Cu over 7m, and 0.48% Cu over 25.9m, successfully
confirming the mineralized sulphide copper system at depth. At this early stage of work on
Dumbwa, drilling is designed to both test the geological models a nd to quickly develop a
clear understanding of the host structure for copper mineralization along the entire ~ 20-
kilometre strike-length of the target. Assay results are provided below from holes DBW -25-
003 and DBW-25-007.
Hole DBW-25-003 intercepted 0.48% Cu over 25.9m and 0.29% Cu over 5.2m in shear zone
controlled mineralization.
Hole DBW-25-007, located 500m south of DBW -25-003, intercepted 0.51% Cu over 39.7m
including 1.13% Cu over 7.0m and 0.33% Cu over 23.0m , also in shear -zone controlled
mineralization. Malachite and chalcopyrite were observed starting at 6m, followed by nearly
continuous copper sulphides being observed for over 150m.
Hole ID From (m) To (m) Interval (m) Cu (%)
DBW-25-003 19.2 24.4 5.2 0.29
and 56.5 82.4 25.9 0.48
DBW-25-007 4.0 20.0 16.0 0.31
and 52.0 75.0 23.0 0.33
and 100.3 140.0 39.7 0.51
including 122.0 129.0 7.0 1.13
Table1: Assay results based on four-acid digest, ICP-OES Finish. Intervals listed are based on drilling intervals and
therefore are considered relative rather than true widths.
Midnight Sun’s COO, Kevin Bonel, states “We have successful initial intercepts confirming
sulphide copper mineralization at Dumbwa, just a few holes into the first systematic drilling
program ever conducted on this massive target. We do not believe we have reached the
heart of the system yet, and as we advance along this immense strike extent, we expect to
see areas of both broader mineralization and increased grade. We are continually fine-tuning
our model, paving the way for rapid delineation of the overa ll Dumbwa system. From my
personal experience at Lumwana, the initial phases of exploration drilling at Lubwe and
Kamaranda followed a very similar pattern of the early holes hitting good mineralisation that
further evolved the early model and allowed more precise drill targeting and proving of the
large copper minerali zed systems. Holes DBW -25-003 and DBW -25-007 have provided
grades and thicknesses which are comparable to those encountered at Lumwana,
reinforcing our analogue between the two, very early on in this process.”
The mineralization intercepted in holes DBW-25-003 and DBW-25-007 occurs broadly within
near vertical shear zones; copper sulphide mineral emplacement occurring within the shear
zone, the overlying hanging wall rock, and immediate foot wall rock. Copper mi neralization
is predominantly comprised of bornite, chalcopyrite and chalcocite occurring in
disseminated form; occasional -massive mineralization within quartz blow outs; coarse -
grained sulphide clotting; and within healed fractures and veins.
Immediately following hole DBW -25-003 and discovery hole DBW -25-007, Midnight Sun
completed holes DBW-25-009 and DBW-25-010 to ascertain the east-west lateral extent of
the mineralization observed at the top of hole DBW-25-007 and to confirm the near vertical
dip of the mineralized shear zones that were identified from oriented core. Hole DBW -25-
009 was drilled 50m east and DBW-25-010 was drilled 120m west of the discovery hole DBW-
25-007.
The two step-out holes confirmed the presence of multiple parallel shears zones and their
near vertical orientation. In hole DBW -25-009, three distinct mineralized shear zones were
intercepted, including a new parallel minerali zed shear zone. In hole DBW -25-010, up dip
confirmation of mineralization was observed over broad intervals. Additionally, new
mineralized zones were also intercepted west of the original mineralized shear zones
identified in the discovery hole DBW-25-007.
Assay results for outstanding holes including DBW-25-009 and DBW-25-010 have been rush
ordered at SGS Labs in Kalulushi, Zambia while diamond drilling continues to follow the
mineralization along strike northward.
The current interpretation of the geological model indicates multiple near-vertical, parallel
to sub-parallel shear zones, which remain open to the east and west, as well as along the full
~20-kilometre strike length of the target area.
Quality Control/Quality Assurance
Drilling was conducted using a conventional diamond drilling rig and drill core was captured
for the entirety of each hole and placed into plastic core trays. All drill holes were cored in
PQ until stable ground was achieved and then reduced to HQ size for the remainder of each
hole. Sampling was based on visible copper mineralization and sample intervals honoured
any important lithological boundaries. Core was then cut in house using a diamond saw and
the right half of core was placed into a 200 micron pla stic bag, assigned a unique sample
number, and recorded into GeoSpark logging system. Samples always remained under the
supervision of Midnight Sun staff to maintain chain of custody. All samples were then
delivered to SGS Labs located in Kalulushi, Zambia, a fully accredited laboratory. Once
received, the samples are sorted, dried, crushed, and pulverized (SGS code PRP90) followed
by four-acid digest with ICP-OES finish (SGS Code ICP42S). Copper range of detection is 0.01-
10%. Midnight Sun follows an in-house QA/QC program that consisted of a random insertion
every 10 th sample of either a coarse blank, fine blank, coarse duplicate, fine duplicate, or
Certified Reference Material (standards).
Location of Reported Drill Holes
Hole ID XCOORD YCOORD AZIMUTH DIP EOH (m)
DBW-25-003 440515 8627810 90 -60 166.5
DBW-25-007 440400 8627310 270 -60 210.0
• WGS84 UTM35S
Qualified Person: Darin Labrenz, P.Geo., a consulting geologist for the Company and
Qualified Person under NI 43 -101, has reviewed and approved the technical data and
contents of this release.
About Midnight Sun
Midnight Sun is focused on exploring our flagship Solwezi Project, located in Zambia.
Situated in the heart of the Zambia-Congo Copperbelt, the second largest copper producing
region in the world, our property is vast and highly prospective. Our Solwezi Project is
surrounded by producing copper mines, including Africa’s largest copper mining complex
right next door, First Quantum’s Kansanshi Mine. Led by an experienced geological team
with multiple discoveries and mines around the world to their credit, Midnight Sun ’s goal is
to find and develop Zambia’s next generational copper deposit.
ON BEHALF OF THE BOARD OF MIDNIGHT SUN MINING CORP.
Al Fabbro
President & CEO
For Further Information Contact:
Adrian O’Brien
VP Business Development and Communications
Tel: +1 604 809 6890
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