BP Silver Intersects Bonanza Grade Silver at the Cosuño Silver Project Hole CO-0008 Returns 5.0m at 600 g/t Silver within a Broad 38m Zone Returning 116 g/t Silver
BP Silver Intersects Bonanza Grade Silver at the Cosuño Silver Project
Hole CO-0008 Returns 5.0m at 600 g/t Silver within a Broad 38m Zone Returning 116 g/t
Silver
Vancouver, British Columbia – (February 27, 2026) – BP Silver Corp. (TSXV: BPAG) (“BP
Silver” or the “ Company”) announces final assay results (“Assays”) from the remaining eight
drill holes of its eleven-hole Phase I drill program (the “Program”) at the Cosuño Silver Project
(“Cosuño”) in Bolivia.
Highlights
• Drilling intersect ed multiple zones of high-grade silver mineralization at the Poca ñita
Chica target : Diamond Drill Hole (“ DDH”) CO-0008 returned 5m @ 600.4 g/t silver,
including 1m @ 1655 g/t silver; CO-0009 returned 1m @ 526 g/t silver and 6m @ 147 g/t
silver.
• The Program achieved its primary objective of confirming silver mineralization within the
lithocap beneath surface geochemical anomalies, materially de-risking Cosuño.
• Silver mineralization was intersected in all four targets tested across an approximately 2.7
km NE–SW corridor, confirming the presence of a robust silver and polymetallic system
which remains open for expansion along strike and at depth.
Dr. Stewart D. Redwood, Director and Qualifying Person , stated, “Our recent drill program has
delivered compelling high-grade silver results, highlighted by an intersection of 5 meters at 600.40
g/t silver and 1 meter grading 1,655.00 g/t silver — equivalent to an exceptional 1.65 kilograms
of silver per tonne over that interval. These results validate the potential discovery of deposit
within the large 10.5 km² alteration zone that remains largely covered and only minimally tested,
underscoring the significant exploration upside. The next phase of exploration will advance the
project through extensive geophysical surveys to better define the size and continuity of the four
drilled targets, refine Phase II drill planning, and identify additional t argets concealed beneath
thin surface cover, positioning the project for continued growth.”
Dr. Redwood continued, “We expect Cosuño’s grades to increase when we drill deeper into and
below the lithocap. Lithocaps are extensive zones of clay and silica alteration that form in the top
part of Bolivian polymetallic vein systems and tin porphyries, similar to those which overlie
porphyry copper deposits. The nearest neighbour to Cosuño, in a similar geological setting, the
Pulacayo deposit, has a large lithocap that is barren and conceals a major vein that produced 640
million ounces of silver and 200,000 tons each of lead and zinc.”
Readers are cautioned that the Pulacayo deposit discussed above is an adjacent property and that
BP Silver has no interest in or right to acquire any interest in the deposit, and that mineral deposits
on adjacent or similar properties, and any production therefore or economics with respect thereto,
are not in any way indicative of mineral deposits on BP Silver’s Cosuño property or the potential
production from, or cost or economics of, any future mining of any of BP Silver’s mineral
properties.
Drill Results
Assays released are from the remaining 8 drill holes (results from CO-0001 and CO -0002 were
previously released in a news release dated February 2, 2026 ), which tested four initial surface
targets identified within the large ~10.5km2 Cosuño hydrothermal system (Table 1 & Figure 1).
The assays demonstrate that silver and gold mineralization identified at surface continues at depth
within the lithocap. The results are significant because lithocaps are usually barren in similar
Bolivian systems, indicating Cosuño’s potential for further discoveries at depth and in covered
areas.
Hole No Target From m To m Interval m Ag g/t Au g/t AgEq g/t
CO-0001 Jalsuri 22 86 64 37.29 0.21 51.96
inc. 35 64 29 56.03 0.28 75.15
inc. 35 40 5 97.72 0.39 122.97
And 48 51 3 129.93 0.47 159.51
CO-0002 Jalsuri 42 77 35 22.8 0.44 57.41
inc. 57 59 2 43.75 1.34 150.96
CO-0003 Jalsuri 7 35 28 30.58 0.27 50.66
inc. 14 20 6 47.70 0.58 92.09
inc. 30 33 3 57.30 0.37 83.74
inc. 32 33 1 105.00 0.59 146.20
CO-0003A Jalsuri 14 57 43 20.40 0.15 31.32
inc. 14 27 13 34.28 0.16 45.05
inc. 33 46 13 25.17 0.18 38.22
CO-0004 Pocalleta 10.6 35.6 25 61.13 0.02 58.50
inc. 19.6 21.6 2 212.50 0.04 200.92
inc. 26.6 30.6 4 142.18 0.04 135.52
42.6 47.6 5 56.64 0.02 54.32
inc. 45.6 46.6 1 243.00 0.07 231.75
CO-0006 Benhur 28 31 3 54.43 0.07 56.38
inc. 30 31 1 123.00 0.09 121.80
CO-0006A Benhur 24 27 3 80.63 0.07 80.75
43 46.2 3.2 63.29 0.03 61.33
CO-0007 Benhur 28.35 32.35 4 67.65 0.09 70.32
CO-0008 Pocanita Chica 11 49 38 116.39 0.01 109.07
inc. 29 34 5 600.40 0.01 559.19
inc. 30 31 1 1655.00 0.01 1539.97
CO-0009 Pocanita Chica 19 77 58 46.23 0.02 44.64
inc. 19 22 3 240.03 0.01 224.05
And 19 20 1 526.00 0.01 490.00
inc. 33 39 6 147.10 0.01 137.63
Table 1: Significant drill intersections from Phase I drilling, Cosuño Silver Project.
Notes to the table:
(1) Intersections calculated at cutoff grades of 10 g/t Ag with sub -intervals at 30, 60 and 90 g/t Ag, or 0.5 and
1.0 g/t Au. The intervals may include some internal dilution.
(2) Au for CO-0001 and CO-0002 is by fire assay 30 g with AAS finish (AA-25).
(3) Au for CO-0003 to CO-0009 is by ICP (ME-MS41) which is semi-quantitative and is preliminary until fire
assay (AA25) is completed.
(4) Ag and multielement were analyzed by aqua regia and ICP -MS (ME-MS41). Ag >100 ppm was reassayed
by aqua regia and ICP -AES (Ag-OG46). Ag > 1000 g/t was reassayed by fire assay and gravimetry (Ag -
GRA46).
(5) AgEq = (Ag grade * Ag recovery) + ((Au grade * Au price/ Ag price) * Au recovery).
(6) Prices Au $3431.54/oz, Ag $40.03/oz (London Bullion Market Association average 2025) .
(7) The project is at an early stage, and there is no metallurgical test work to date. Assumed recoveries are 93%
Ag and 96% Au by comparison with the Santa Ana deposit, Colombia (NI 43 -101 mineral resource report
for Outcrop Silver and Gold Corporation, 8 June 2023).
(8) For CO-0001 and CO -0002, AgEq is restated from the previous press release using the assumed recovery
factors.
(9) Above are core lengths as true widths are not known at this time.
(10) Hole CO-0005 was not drilled . CO-0010 intersected no significant mineralization and therefore was not
submitted for assay.
Figure 1: Cosuño mineralized corridor, demonstrating a multi-kilometer hydrothermal corridor
with confirmed silver-dominant mineralization at several targets.
The Program successfully tested key zones along a 2.7 km structural trend, returning significant
silver intercepts at the 4 targets tested to date (Figures 1 to 3):
• Pocañita Chica – Broad mineralized envelopes with high-grade silver intervals hosted in
hydrothermal breccias.
• Pocalleta – Structurally controlled vein mineralization confirming depth potential.
• Jalsuri – High-grade silver intercepts with gold 2.7 km northeast of Pocañita Chica,
indicating district-scale continuity.
• Benhur – Additional silver mineralization along the same structural corridor.
Cosuño Drill Program Overview
The Program tested four priority targets defined by structurally controlled, outcropping
geochemically anomalous to highly anomalous silver -rich polymetallic zones characterized by
silicification, intermediate to advanced argillic alteration, sulfides and brecciation: features typical
of many significant Bolivian silver deposits. The targets occur within a large ~10.5 km²
hydrothermal alteration system as defined by detailed mapping, geochemical sampling and remote
sensing alteration studies (Figure 1).
Figures and additional geological background from the initial program can be found in the
Company’s news releases of October 21, 2025, November 14, 2025, and February 2, 2026.
Detail
This marks the first drill program completed within the Cosuño project. Holes CO-0001 and CO-
0002 (Figure 1 and Table 2) were previously reported in a news release dated February 2, 2026.
Hole_ID Easting Northing Depth (m) Azimuth (°) Dip (°)
CO-0001 747065 7762846 101 235 -45
CO-0002 747063 7762848 107 170 -45
CO-0003 746997 7762848 56 80 -50
CO-0003A 747037 7762775 74 30 -55
CO-0004 746463 7760731 66 195 -65
CO-0006 746972 7761491 48 230 -60
CO-0006A 746971 7761490 90 230 -45
CO-0007 746975 7761491 80 200 -45
CO-0008 745656 7760370 100 130 -50
CO-0009 745692 7760449 100 125 -55
CO-0010 745855 7760900 84 200 -50
Table 2: Phase I drill program collars.
Figure 2: Geological cross-section of the Pocañita Chica Target displaying interpreted structural
controls on mineralization along the drill hole trajectory and the corresponding mineralized
intercept in DDH CO-0008.
Mineral System Analysis
Interpretation of the results from the Pocañita Chica and Pocalleta targets highlight approximately
300 meters of vertical difference and a lateral separation of about 0.8 km between the two targets
(Figure 3). Importantly, geochemical results indicate elevated copper, tin and indium values at
lower elevations within the system (Table 3). This vertical metal zonation suggests strengthening
base and critical -metal enrichment at depth, consistent with a vertically developed polymetallic
system.
The geological cross section below shows the vertical and lateral relationship between the Pocañita
Chica resurgent dome and the deeper Pocalleta vein system within the Cosuño caldera (Figure 1
& 3). Both targets are interpreted as parts of a single, large, vertically zoned magmatic -
hydrothermal system. Pocañita represents a shallow resurgent dome affected by intense
hydrothermal brecciation and strong silver mineralization (Figure 4A) . Advanced argillic
alteration (quartz –alunite ± pyrophyllite) is commonl y associated with a high -sulfidation
epithermal mineralization environment formed at shallow depth reflecting vigorous metal bearing
fluid upflow.
Approximately 0.8 km away and structurally deeper, the Pocalleta vein system is hosted in
competent volcanic rocks. Alteration is dominated by white mica, indicating higher temperatures
and deeper formation levels. Mineralization includes significant silver with anomalous tin and
freibergite, supporting a hotter, more proximal position relative to the intrusive source (Figure 4B).
The silver–tin association, white mica alteration, and temperature-sensitive alteration suggest that
Pocalleta represents a deeper, more thermally evolved part of the same system. This vertical metal
and alteration zoning is similar to that found in productive Bolivian silver systems.
Figure 3: Geological Interpretation – Pocañita–Pocalleta System, Cosuño Project.
Figure 4A: Hole CO-0008 from 30m to
31m, 1m @ 1655 g/t silver in matrix
supported polymictic hydrothermal breccia
with strong silicification and advanced
argillic alteration / cement (alunite, dickite,
diaspore) and silver sulfosalts.
Figure 4B: Hole CO-0004 from 29.6m to
30.6m, 1m @ 261 g/t silver in veinlet with
white mica alteration and veinlet with silver
sulfosalts.