Columba drilling returns 10 meters of 503 gpt silver, 0.1% lead, 0.6% zinc and 9.88 meters of 319 gpt silver, 0.1% lead and 0.6% zinc from the Columba Drill Program

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# Columba drilling returns 10 meters of 503 gpt silver, 0.1% lead, 0.6% zinc and 9.88 meters of 319 gpt silver, 0.1% lead and 0.6% zinc from the Columba Drill Program

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# Columba drilling returns 10 meters of 503 gpt silver, 0.1% lead, 0.6% zinc and 9.88 meters of 319 gpt silver, 0.1% lead and 0.6% zinc from the Columba Drill Program
March 2, 2026
Columba drilling returns 10 meters of 503 gpt silver, 0.1% lead, 0.6% zinc and 9.88 meters
of 319 gpt silver, 0.1% lead and 0.6% zinc from the Columba Drill Program
Kootenay Silver Inc. (TSXV: KTN; OTCQX: KOOYF) (the "Company" or "Kootenay") is
pleased to announce additional assay results from nine more drill holes at its Columba High-
Grade Silver Project in Chihuahua, Mexico.
The staged 50,000-meter drill program is well underway with approximately 17,000 meters
completed and 24 holes now reported. The recently closed financing allows for an additional
10,000 meters of drilling for a total of 60,000 meters at Columba.
Expansion drilling is the focus with systematic ~ 100-meter step outs from the known resource
bodies which remain open in 2 or 3 directions. These known resource bodies currently host an
inferred Mineral Resource Estimate (“MRE”) totaling 54.1 Moz of silver based 5.92 Mt at a grade
of 284 gpt (see News Release June 17, 2025).
The results contained herein include four holes targeting D Vein and five holes targeting the sub-
parallel B2/Lupe Vein System.
Highlights include:
D Vein Trend
Hole CDH-25-230 was a step out hole and holes CDH-25-232 and 234 were drilled to test a
large 200m long zone in the central D Vein trend. Of interest, CDH-25-230 intercepted a thin
hanging-wall vein above the D Vein target grading 0.7m of 1,020 gpt silver, 0.6% lead and
1.5% zinc. Hole CDH-25-232 intersected a broad low-grade section on the D trend with a thin
high grade footwall vein of 3,640 gpt silver over0.3 meters.
• CDH-25-230
o Hangingwall (blind) vein system shows some high grades, roughly 100m above
Main D Vein target zone includes;
o 0.7 meters (0.42m estimated true width “etw”) grading 1,020 gpt silver and
0.7% lead.
• CDH-25-232
o 16.50 meters (12.64m etw) grading 76 gpt silver, 0.1% lead and 0.2% zinc.
o Footwall Vein 0.3 meters (0.23m etw) grading 3,640 gpt silver, 1.2% lead and
3.6% zinc from a downhole depth of 457.35 meters.
Lupe-B2 Trend
Southeasterly extension of the F Vein trend, Lupe/B2 Veins are hosted within a broad corridor
of veining oriented to the east-southeast.
Five holes form this corridor are reported herein, two of which, CDH-25-233 and 235 represent
the deepest intersections on Lupe Vein to date, both holes returning >1000 gpt silver.
This corridor of veins is showing excellent potential for strong widths and high grades. It
remains open along strike and to depth showing strong growth potential. See the long sections
for Lupe and B 2 Veins for visual reference.
• CDH-25-233
o One of deepest intercepts on Lupe vein to date.
o Three main silver bearing structures intercepted, the first includes two blind veins
related to the G Vein system, then Lupe Vein and B2 Vein deeper downhole.
o G Vein mineralization 1.15 meters of 106 gpt silver immediately above a second
vein hits 1.35 meters of 122 gpt silver (from 158.4 and 161.65 meters downhole
respectively).
o Lupe Vein System;
▪ 10 meters (5.30m etw) of 503 gpt silver, 0.1% lead, 0.6% zinc from 372
meters downhole.
▪ Includes 1.10 meters (0.58m etw) of 3,620 gpt silver, 0.1% lead, 0.8%
zinc.
o B2 Vein System;
▪ 4.80 meters (2.54m etw) averaging 78 gpt silver, 0.2% lead and 0.6%
zinc from 392 meters downhole
o Open along strike and to depth.
• CDH-25-235
o One of deepest intercepts on Lupe Vein to date.
o Intersected Lupe Vein on the westernmost end of the known Lupe structure to date.
o Lupe Vein intercepted within a zone measuring 9.88 meters (6.08m etw)
averaging 319 gpt silver, 0.1% lead and 0.6% zinc from 423.67 meters
downhole.
▪ Includes:
▪ 0.80 meters (0.50 etw) of 946 gpt silver, 0.25% lead and 1.1% zinc from
426.0 meters downhole; and
▪ 0.65 meters (0.40 meters etw) of 1,030 gpt silver, 0.3% lead and 0.7%
zinc from 430.9 meters downhole
For further details, follow the link to cross sections (B2/Lupe Vein and D Vein) and long sections
(B2 Vein, Lupe Vein, D Vein).
Drilling continues with two drills as Kootenay works to expand accommodation and core storage
capacity at Columba. Upon completion the Company intends to increase the number of drill rigs
at the project.
Kootenay’s President & CEO, James McDonald states,
“Drilling continues to deliver positive results at Columba. Holes CDH-25-220, 223 and 225 along
with previously announced 216 are hitting good wide mineralized vein and vein stockwork breccia
at some of the deepest point tested thus far on the D Vein leaving this area wide open to depth.
Also impressive is the wide-open potential in the Lupe and B 2 veins. This shows well on the long
sections.”
Drill results, CDH-25-228 to 235
est true
From To Interval Silver Geologic
Hole ID width1 Pb % Zn%
(meters) (meters) (meters) gpt Intersection
(m)
B2 Vein (Lupe
CDH-25-228 225.50 226.00 0.50 0.31 184 0.1 0.2 intercept above
grade line)
CDH-25-229 244.00 257.50 13.50 8.12 34 0.0 0.0 Lupe Vein System
incl 253.50 255.50 2.00 1.20 115 0.0 0.1 Lupe Vein System
AND 313.37 314.00 0.63 0.38 199 0.1 0.1 B2 Vein
AND 382.75 384.00 1.25 0.75 203 0.1 0.5 Footwall to B2
HW Vein to D
CDH-25-230 343.30 344.00 0.70 0.42 1020 0.7 1.6 System
AND 643.00 643.50 0.50 0.30 5 0.6 5.1 D Vein
CDH-25-231 294.40 295.00 0.60 0.30 228 0.0 0.1 Lupe Vein System
AND 307.15 308.20 1.05 0.53 160 0.0 0.1 Lupe Vein System
AND 312.85 317.00 4.15 2.07 81 0.0 0.0 Lupe Vein System
AND 415.45 415.80 0.35 0.18 255 0.4 0.2 B2 Vein
CDH-25-232 429.00 445.50 16.50 12.64 76 0.1 0.2 D Vein System
AND 457.35 457.65 0.30 0.23 3640 1.2 3.6 D Vein System
CDH-25-233 158.40 159.55 1.15 0.61 106 0.0 0.1 G Vein System
AND 161.65 163.00 1.35 0.72 122 0.1 0.1 G Vein System
AND 372.00 382.00 10.00 5.30 503 0.1 0.6 Lupe Vein System
Incl 373.00 374.10 1.10 0.58 3620 0.1 0.8 Lupe Vein
AND 392.00 396.80 4.80 2.54 78 0.2 0.6 B2 Vein System
CDH-25-234 507.55 522.00 14.45 9.29 31 0.4 1.3 D Vein System
AND 536.40 541.15 4.75 3.04 98 0.1 2.1 D Vein System
AND 641.75 642.25 0.50 0.32 13 2.9 8.0 FW of D Vein
AND 662.00 665.00 3.00 1.92 6 1.2 4.5 FW of D Vein
CDH-25-235 423.67 433.55 9.88 6.08 319 0.1 0.6 Lupe Vein System
Sub int 1 426.00 428.00 2.00 1.24 687 0.2 0.8 Lupe Vein
INCL 427.20 428.00 0.80 0.50 946 0.2 1.1 Lupe Vein
Sub int 2 430.40 431.55 1.15 0.71 874 0.2 0.6 Lupe Vein
INCL 430.90 431.55 0.65 0.40 1030 0.3 0.7 Lupe Vein
1
Estimated true widths are based on current interpretation of mineralized structures and interval
The current phase of work comprises a planned total 50,000 meter drilling now expanded to 60,000
meters program focused on expanding the size of the resource detailed in the Company’s recent
43-101 Mineral Resource Estimate (“MRE”). The maiden MRE is detailed in a report entitled
“Technical Report on the Maiden Mineral Resource Estimate for the Columba Ag-Pb-Zn Project,
Chihuahua State, Mexico” and dated August 1, 2025, MRE effective date, May 29, 2025 was filed
on SEDAR+ at www.sedarplus.ca and is also available at the Company’s website at
www.kootenaysilver.com. Kootenay Silver is fully funded through to the completion of the current
50,000 meter exploration drill campaign.
Columba High Grade Silver Project represents the fourth, newest and highest-grade silver deposit
discovered and advanced in Mexico by Kootenay Silver since 2006. A comprehensive list of drill
results completed on the Columba Property since 2019 may be viewed here: Columba Drill
Results.
About Columba Project
The Columba project is a classic high grade epithermal vein system. That management believes is
a newly recognized vein district. It is similar in character and size of other vein districts in Mexico
known to have deposited significant resources of silver or gold such as La Chispas and Panuco.
Hosted within a volcanic caldera setting, the surface extent of mapped veins measures roughly 4
kilometers by 3 kilometers. Vein mineralization occurs over a minimum vertical extent of 350
meters as shown by drilling. The veins appear to be intermediate sulfidation veins indicating the
potential for depths exceeding 700 meters of vertical extent. This remains to be tested, and all veins
remain open to depth.
The veins cut every known rock type on the project and the veins or vein structures can be traced
across the highest elevations of the caldera. This indicates veins formed late in caldera history. As
elevation increases vein development becomes irregular eventually being replaced by breccias at
the higher elevations. Silver grades diminish with increasing elevation right down to background
values. Correspondingly silver grades increase with depth from background at higher elevations
to highs of kilograms per tonne at depth. It is evident from these features that the vein system has
undergone almost no erosion and so whatever silver was deposited originally is largely still there.
A general rule of thumb on the project is at levels deeper than 1,750 meters above sea level is
where good grades begin to appear. This is what is referred to as the grade line.
Prior to Kootenay Silver no exploration had occurred at Columba in nearly 40 years. Historically
there were two periods of mining on one of the veins referred to as the F Vein. The first being in
the early 1900’s when underground development included 6 drifts (tunnels) at different levels
coming off a 200-meter-deep shaft. This work was halted by the Mexican Revolution. Then a
second brief period of mining occurred around 1958 to 1960 when a small private company used
the old development to mine. It is estimated that around 100,000 tonnes were mined.
Kootenay acquired 100% of the project and has completed detailed mapping, LiDAR, and airborne
magnetic surveys across much of the vein system. The company also has a 24-year surface access
agreement that includes annual and other payments and allows for both exploration and
exploitation. The agreement covers all the mineralized areas drilled to date.
Sampling and QA/QC at Columba
All technical information for the Columba exploration program is obtained and reported under a
formal quality assurance and quality control (“QA/QC”) program. Samples are taken from core
cut in half with a diamond saw under the direction of qualified geologists and engineers. Samples
are then labeled, placed in plastic bags, sealed and with interval and sample numbers recorded.
Samples are delivered by the Company to ALS Minerals (“ALS”) in Chihuahua. The Company
inserts blanks, standards and duplicates at regular intervals as follows. On average a blank is
inserted every 100 samples beginning at the start of sampling and again when leaving the mineral
zone. Standards are inserted when entering the potential mineralized zone and in the middle of
them, on average one in every 25 samples is a standard. Field duplicates as well as coarse and pulp
duplicates are taken in the mineralized intervals at an average 2 duplicates for each hole.
The samples are dried, crushed and pulverized at ALS Global’s Chihuahua laboratory with the
pulps being sent airfreight for analysis by ALS Global in Vancouver, B.C. Systematic assaying of
standards, blanks and duplicates is performed for precision and accuracy. Analysis for silver, zinc,
lead and copper and related trace elements was done by ICP four acid digestion, with gold analysis
by 30-gram fire assay with an AA finish. All drilling reported is HQ core and was completed by
Globextools, S.A. de C.V. of Hermosillo, Sonora, Mexico.
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