Northisle Announces Infill Drill Results at Northwest Expo Extend Strike and Add New High-Grade Intervals High-grade interval in NW25-57 of 117.0 metres at 1.50 g/t Au Eq., including 52.5 metres at 1.91 g/t Au Eq.
Northisle Copper and Gold Inc. | 14th Floor – 1040 West Georgia St. | Vancouver, BC | V6E 4H1
www.northisle.ca | [email protected]
March 31, 2026
TSXV: NCX
OTCQX: NTCPF
Northisle Announces Infill Drill Results at Northwest Expo
Extend Strike and Add New High-Grade Intervals
High-grade interval in NW25-57 of 117.0 metres at 1.50 g/t Au Eq., including 52.5 metres at 1.91 g/t Au Eq.
Highlights:
• Selected gold-equivalent assay intercepts include:
o NW25-57: 117.0 metres at 1.50 g/t Au Eq. from 231.0 metres, including 52.5 metres at 1.91 g/t Au Eq. from
256.5 metres
o NW25-54: 75.0 metres at 1.37 g/t Au Eq. from 246.0 metres, including 42.0 metres at 1.69 g/t Au Eq. from
279.0 metres and a higher-grade interval of 18.2 metres at 2.86 g/t Au Eq. from 333.7 metres
o NW25-53: 107.7 metres at 1.20 g/t Au Eq. from 254.0 metres, including 67.5 metres at 1.76 g/t Au Eq. from
254.0 metres
• Mineralization at Northwest Expo has now been extended to approximately 1.1km of strike length
• Results confirm consistent mineralization, and higher grades in Northwest Sector of pit shell
o Northwest Sector: significantly higher-grade mineralization discovered within resource pit shell
o Central Sector: high-grade mineralization from PEA resource model confirmed
o Southeast Sector: shallow mineralization from PEA resource model confirmed
o Deep Sector: lower-grade mineralization from PEA resource model confirmed
• PFS infill drilling campaign finalized, with 13,980 metres in total and results from Red Dog expected in Q2 2026
Vancouver, B.C. – Northisle Copper and Gold Inc. (TSX-V: NCX, OTCQX: NTCPF) (“Northisle” or the “Company”) is
pleased to announce additional drill results from its infill drilling campaign at the Northwest Expo deposit. A total of
8,464 metres were drilled at Northwest Expo with the objective of upgrading Inferred resources to the Indicated
category in support of the ongoing Pre -Feasibility Study at the North Island Project (the “North Island PFS”) , while
improving confidence in the continuity and geometry of higher -grade mineralization at Northwest Expo and
extending the strike length of the mineralized footprint.
Sam Lee, President & CEO commented “We are highly encouraged by these results at Northwest Expo , which
expand our understanding of the North Island Project’s broader exploration potential. The results have increased
our confidence level in the first phase of the project by identifying higher-grade, gold-rich mineralization in certain
zones within the 2025 PEA pit shell. With a robust balance sheet, Northisle is uniquely positioned to simultaneously
create value through project development and drive continued growth in the mineral potential of the district.”
Discussion of Drill Results
The 2025 infill drilling program at Northwest Expo was designed to improve confidence in the continuity and
geometry of higher -grade mineralization while supporting the conversion of Inferred resources to the Indicated
category. A total of 8,464 metres wer e drilled, with hole distribution designed to confirm the continuity of
mineralization and the distribution of gold and copper grades. Results received to date demonstrate consistent
mineralization over broad intervals, with locally developed higher -grade domains that contribute to the gold -rich
profile of the mineralized system at Northwest Expo.
The results confirm that mineralization at Northwest Expo is characterized by continuous, near -surface to
moderately deep intervals of gold -rich copper mineralization, with molybdenum contributing significantly in some
Northisle Copper and Gold Inc. | 14th Floor – 1040 West Georgia St. | Vancouver, BC | V6E 4H1
www.northisle.ca | [email protected]
instances to the overall metal endowment. The current results highlight both the lateral and vertical continuity of
mineralization, as well as the presence of discrete higher-grade zones within broader mineralized envelopes.
Holes NW25-42, NW25-43, NW25-44, NW25-45, NW25-46, NW25-47, NW25-49 and NW25 -51 were drilled in the
southeastern portion of the deposit, targeting the extension of mineralization beyond the limits of historical drilling
used in the current resource model. Results from this sector confirm the continuation of mineralization, with broad
intervals such as NW25-45 (99.0 metres at 0.43 g/t Au Eq. from 56.0 metres) and NW25-46 (102.0 metres at 0.55 g/t
Au Eq. from 348.0 metres) demonstrating consistent grade over significant thicknesses. In addition, higher -grade
intervals within these broader zones, including NW25-47 (51.9 metres at 0.77 g/t Au Eq. from 349.4 metres), support
the presence of internally developed higher-grade domains (see Table 1).
In contrast, holes NW25-53, NW25-56, NW25-57, NW25-61 and NW25-63 were designed to test the northwestern
extent of the resource model and returned intervals characterized by significant thicknesses and higher gold grades,
demonstrating continuity of mineralization and supporting the potential extension of higher -grade domains in this
direction. Notable intercepts include NW25 -57 (117.0 metres at 1.50 g/t Au Eq. from 231.0 metres, including 52.5
metres at 1.91 g/t Au Eq. from 256.5 metres), NW25-53 (107.7 metres at 1.20 g/t Au Eq. from 254.0 metres, including
67.5 metres at 1.76 g/t Au Eq. from 254.0 metres), and NW25-61 (101.7 metres at 1.18 g/t Au Eq. from 242.7 metres,
including 60.0 metres at 1.56 g/t Au Eq. from 258.0 metres), as well as higher -grade intervals in NW25 -63 (10.2
metres at 2.25 g/t Au Eq. from 296.8 metres). This area demonstrates potential for continued growth, supported by
consistently elevated gold grades and the persistence of mineralized intervals (see Table 3).
Holes NW25-52, NW25-54, NW25-55, NW25 -58 and NW25 -60 were drilled in the central portion of the deposit,
targeting the core of the mineralized system and areas of previously identified higher -grade gold mineralization.
NW25-54, which intersected 75.0 metres at 1.37 g/t Au Eq. from 246.0 metres, including 42.0 metres at 1.69 g/t Au
Eq. from 279.0 metres and a higher-grade interval of 18.2 metres at 2.86 g/t Au Eq. from 333.7 metres, confirms the
presence of high -grade gold mineralization previously identifie d in hole NW24 -29 (see news release dated
November 5, 2024), which reported 132.8 metres at 1.49 g/t Au Eq. NW25-54 is located approximately 100 metres
above NW24-29 in the same section, indicating the presence of shallower higher -grade gold mineralization in this
area.
Additional drilling in the central portion of the deposit confirmed strong continuity of higher -grade mineralization.
NW25-60, which intersected 88.8 metres at 1.38 g/t Au Eq. from 198.0 metres, including 42.0 metres at 1.84 g/t Au
Eq. from 240.0 metres, i s located approximately 65 metres southeast of NW25 -54 and approximately 60 metres
south of NW24-29, and indicates continuity of the higher-grade gold mineralization observed in this area. In addition,
NW25-52, which intersected 115.6 metres at 1.22 g/t Au Eq. from 248.9 metres, including 33.0 metres at 1.94 g/t Au
Eq. from 269.0 metres, together with NW25-58, which intersected 61.2 metres at 1.15 g/t Au Eq. from 189.0 metres,
including 17.3 metres at 1.81 g/t Au Eq. from 195.8 metres, and NW25-55, which returned 81.2 metres at 1.09 g/t Au
Eq. from 287.8 metres, including 18.0 metres at 1.89 g/t Au Eq. from 291.0 metres, confirm the persistence and
lateral continuity of higher-grade gold mineralization across the central portion of the deposit (see Table 2).
Holes NW25 -48, NW25 -50, NW25 -59 and NW25 -62 were drilled to test the depth extension of the mineralized
system near the lower limits of the current resource model. Results from this sector confirm the presence of gold
mineralization at depth, although at l ower grades relative to other areas of the deposit. Notable intercepts include
NW25-62 (159.0 metres at 0.51 g/t Au Eq. from 255.0 metres, including 54.0 metres at 0.79 g/t Au Eq. from 357.0
metres) and NW25-59 (43.0 metres at 0.29 g/t Au Eq. from 332.0 me tres). Holes NW25-48 (27.0 metres at 0.31 g/t
Au Eq. from 159.0 metres) and NW25 -50 (30.5 metres at 0.26 g/t Au Eq. from 170.5 metres) did not intersect
mineralization at the targeted depth; however, these results confirmed the presence of shallower, lower -grade
mineralization consistent with previous Northisle drilling and historic results (see Table 4).
Additional to the gold -copper mineralization, t he overall outcomes highlight the presence of higher -grade
molybdenum zones spatially associated with the gold -copper mineralization, suggesting potential metal zonation
Northisle Copper and Gold Inc. | 14th Floor – 1040 West Georgia St. | Vancouver, BC | V6E 4H1
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within the system. This pattern may reflect a transition where gold and copper grades decrease while molybdenum
becomes relatively enriched. Further analysis is planned to better define the spatial distribution of metals across
the deposit and to evaluate the implications of this zonation on the geological model.
These results demonstrate the presence of coherent gold-rich, higher-grade domains within the deposit that remain
open and locally enhance the overall grade profile. The consistent occurrence of internal higher -grade intervals
supports the interpretation of lateral and internal continuity and improves confidence in the definition of higher -
grade domains. The Company is planning follow-up drilling to further define and test the extent of these higher-grade
gold zones.
Overall, drilling completed to date supports the interpretation of Northwest Expo as a continuous, gold -enriched
porphyry system with broad higher-grade domains. Infill drilling is improving confidence in both grade continuity and
geological controls, and ongoing and future drilling is expected to further refine the geometry of these domains for
incorporation into future resource updates. To date, mineralization has been outlined over more than 1,060 metres
of strike and extends from approximately 100 metres to 430 metres below surface, and remains open at depth and
along strike.
Table 1: Significant Intercepts at Northwest Expo - Southeast Sector from This Release
Hole ID From
(m)
To
(m)
Interval
(m)
Au Grade
(g/t)
Cu Grade
(%)
Mo Grade
(ppm)
Re Grade
(g/t)
Au Eq.
Grade (g/t)
Cu Eq.
Grade (%)
NW25-42 99.0 119.0 20.0 0.20 0.04 53.43 0.20 0.28 0.26
And 120.8 162.3 41.6 0.18 0.05 73.67 0.36 0.28 0.26
NW25-43 82.5 148.8 66.3 0.21 0.06 89.68 0.26 0.34 0.32
And 164.6 179.0 14.4 0.18 0.04 56.18 0.10 0.25 0.23
And 193.3 215.6 22.3 0.51 0.07 4.16 0.01 0.59 0.54
And 259.0 282.0 23.0 0.26 0.04 47.26 0.11 0.33 0.31
NW25-44 414.0 424.9 10.9 0.21 0.04 74.19 0.59 0.31 0.29
And 445.9 462.0 16.1 0.28 0.08 193.66 0.81 0.49 0.46
NW25-45 38.0 44.0 6.0 0.19 0.00 194.01 0.05 0.31 0.28
And 56.0 155.0 99.0 0.27 0.05 156.41 0.63 0.43 0.40
NW25-46 291.0 330.0 39.0 0.43 0.03 104.54 0.36 0.53 0.50
And 348.0 450.0 102.0 0.41 0.08 78.79 0.17 0.55 0.51
NW25-47 260.0 281.0 21.0 0.12 0.03 172.64 1.32 0.29 0.27
And 302.0 342.0 40.0 0.16 0.04 109.60 0.15 0.27 0.25
And 349.4 401.3 51.9 0.51 0.12 175.40 0.85 0.77 0.71
NW25-49 97.0 105.0 8.0 0.13 0.02 19.85 0.11 0.17 0.15
NW25-51 91.0 98.3 7.3 0.42 0.07 19.05 0.06 0.51 0.47
And 249.0 264.0 15.0 0.33 0.05 55.23 0.04 0.42 0.39
Northisle Copper and Gold Inc. | 14th Floor – 1040 West Georgia St. | Vancouver, BC | V6E 4H1
www.northisle.ca | [email protected]
Table 2: Significant Intercepts at Northwest Expo - Central Sector from This Release
Hole ID From
(m)
To
(m)
Interval
(m)
Au Grade
(g/t)
Cu Grade
(%)
Mo Grade
(ppm)
Re Grade
(g/t)
Au Eq.
Grade (g/t)
Cu Eq.
Grade (%)
NW25-52 202.5 212.8 10.3 0.62 0.03 380.86 2.72 0.95 0.88
And 248.9 364.5 115.6 1.02 0.17 30.88 0.10 1.22 1.14
including 269.0 302.0 33.0 1.65 0.26 19.41 0.02 1.94 1.81
And 370.5 390.0 19.6 0.27 0.07 39.69 0.07 0.37 0.34
NW25-54 246.0 321.0 75.0 1.09 0.21 79.10 0.16 1.37 1.28
including 279.0 321.0 42.0 1.38 0.28 15.72 0.02 1.69 1.58
And 333.7 351.9 18.2 2.44 0.38 14.02 0.01 2.86 2.66
And 355.6 372.0 16.4 0.56 0.17 117.41 0.79 0.82 0.77
NW25-55 201.0 258.2 57.2 0.80 0.07 144.79 0.52 0.97 0.90
And 270.0 279.0 9.0 0.91 0.08 19.40 0.10 1.01 0.94
And 287.8 369.0 81.2 0.88 0.18 26.15 0.05 1.09 1.02
including 291.0 309.0 18.0 1.57 0.29 14.75 0.02 1.89 1.76
also including 315.0 330.0 15.0 1.21 0.21 19.51 0.03 1.46 1.35
And 372.9 390.0 17.1 0.13 0.00 404.51 1.42 0.41 0.38
NW25-58 189.0 250.2 61.2 0.86 0.15 198.68 0.23 1.15 1.07
including 195.8 213.0 17.3 1.32 0.18 503.08 0.40 1.81 1.69
And 277.8 320.8 43.0 0.99 0.20 22.72 0.03 1.22 1.13
including 277.8 303.0 25.2 1.28 0.23 19.69 0.03 1.54 1.43
And 324.0 384.0 60.0 0.20 0.03 294.73 1.40 0.44 0.41
NW25-60 198.0 286.8 88.8 1.12 0.20 66.84 0.08 1.38 1.28
including 240.0 282.0 42.0 1.53 0.28 6.78 0.02 1.84 1.71
And 299.2 354.0 54.8 0.79 0.18 63.52 0.30 1.03 0.96
including 301.0 336.0 35.0 1.09 0.18 33.10 0.06 1.31 1.22
And 363.0 375.0 12.0 0.21 0.01 267.56 2.71 0.45 0.42
Table 3: Significant Intercepts at Northwest Expo - Northwest Sector from This Release
Hole ID From
(m)
To
(m)
Interval
(m)
Au Grade
(g/t)
Cu Grade
(%)
Mo Grade
(ppm)
Re Grade
(g/t)
Au Eq.
Grade (g/t)
Cu Eq.
Grade (%)
NW25-53 254.0 361.7 107.7 1.02 0.16 8.89 0.01 1.20 1.12
including 254.0 321.5 67.5 1.50 0.24 6.99 0.01 1.76 1.64
And 330.0 339.0 9.0 0.25 0.00 276.73 1.06 0.44 0.41
NW25-56 306.0 330.0 24.0 0.41 0.03 730.35 3.09 0.95 0.88
NW25-57 231.0 348.0 117.0 1.22 0.20 99.35 0.57 1.50 1.40
including 256.5 309.0 52.5 1.62 0.26 17.46 0.02 1.91 1.78
also including 315.0 330.0 15.0 1.69 0.44 12.67 0.06 2.17 2.02
And 357.0 366.0 9.0 0.15 0.01 235.15 2.93 0.37 0.35
NW25-61 242.7 344.4 101.7 0.97 0.18 19.69 0.04 1.18 1.10
including 258.0 318.0 60.0 1.28 0.25 13.49 0.02 1.56 1.45
And 347.9 357.0 9.1 0.18 0.01 12.77 0.03 0.20 0.18
And 359.0 390.0 31.0 0.17 0.01 176.07 3.43 0.37 0.34
NW25-63 249.0 277.4 28.4 0.69 0.12 4.97 0.01 0.82 0.77
And 279.0 294.8 15.8 1.14 0.13 5.11 0.00 1.28 1.19
And 296.8 307.0 10.2 2.06 0.17 6.91 0.00 2.25 2.10
And 323.3 343.0 19.8 0.72 0.15 11.33 0.01 0.89 0.82
And 357.0 366.0 9.0 0.15 0.00 1,436.20 11.22 1.27 1.19
Northisle Copper and Gold Inc. | 14th Floor – 1040 West Georgia St. | Vancouver, BC | V6E 4H1
www.northisle.ca | [email protected]
Table 4: Significant Intercepts at Northwest Expo - Deep Sector from This Release
Hole ID From
(m)
To
(m)
Interval
(m)
Au Grade
(g/t)
Cu Grade
(%)
Mo Grade
(ppm)
Re Grade
(g/t)
Au Eq.
Grade (g/t)
Cu Eq.
Grade (%)
NW25-48 159.0 186.0 27.0 0.13 0.00 255.38 0.92 0.31 0.29
And 312.0 339.0 27.0 0.13 0.00 135.39 1.02 0.23 0.22
NW25-50 170.5 201.0 30.5 0.15 0.01 150.78 0.54 0.26 0.24
And 213.0 225.0 12.0 0.16 0.00 407.54 2.69 0.46 0.43
And 246.0 270.0 24.0 0.12 0.01 265.12 0.93 0.31 0.28
NW25-59 294.0 324.0 30.0 0.12 0.00 310.26 0.15 0.31 0.29
And 332.0 375.0 43.0 0.13 0.01 185.10 1.90 0.29 0.27
NW25-62 255.0 414.0 159.0 0.37 0.04 149.91 0.65 0.51 0.48
including 357.0 411.0 54.0 0.58 0.05 229.32 0.58 0.79 0.73
And 447.0 456.0 9.0 0.13 0.03 203.06 0.45 0.29 0.27
Note on equivalent calculation for Northwest Expo:
Gold equivalent grade is determined by calculating total contained metal value/tonne, adjusted for recoveries, if known, dividing by the gold
price, and then multiplying the resultant number of troy ounces of gold by 31.103. Copper equivalent grade is determined by calculating total
contained metal value per tonne, adjusted for recoveries, if known, dividing by the copper price, and then dividing the resultant number of
pounds of copper by 2,204.6. Analyzed metal equivalent calculations are reported for illustrative purposes and consider 91% recovery for
gold, 73% recovery for copper, and assume 80% recoveries for Molybdenum and Rhenium as metallurgical testing has not yet been
completed for these two elements on material from the Northwest Expo deposit.
Gold and copper equivalent calculations based on the following metal prices, which were used in the Company’s 2025 Preliminary
Economic Assessment for the North Island Project: Au = US$2,150/oz, Cu = US$4.20/lb, Mo = US$21/lb, Re = US$1,950/kg. Intervals were
selected based on continuous intercepts with Au grade above 0.1g/t Au or Cu grade above 0.1% Cu. Totals may not add due to rounding.
Intervals are drill intersections and not necessarily true widths. True widths cannot be provided at this time due to the uncertainty in the
geometry of the mineralization. Drill intersections have been selected and composites calculated independently by Northisle. The locations
and distances highlighted on all maps in this news release are approximate.
Table 5: Drill Hole Collar Locations from This Release
Hole ID Length
(m)
UTM
East
UTM
North
UTM
Elevation
Azimuth
(deg)
Dip
(deg)
NW25-42 174 569703 5619054 223 58 -55.0
NW25-43 283 569702 5619055 223 21 -51.7
NW25-44 465 569587 5619451 405 138 -53.2
NW25-45 474 569586 5619451 405 165 -47.1
NW25-46 453 569586 5619451 405 186 -69.4
NW25-47 480 569585 5619451 405 155 -45.1
NW25-48 459 569429 5619408 426 355 -84.8
NW25-49 123 569732 5619051 223 180 -68.7
NW25-50 483 569429 5619408 426 333 -77.3
NW25-51 276 569649 5619019 224 0 -47.4
NW25-52 390 569304 5619456 429 171 -71.8
NW25-53 366 569136 5619643 442 215 -59.9
NW25-54 402 569224 5619600 453 197 -60.6
NW25-55 402 569304 5619458 429 180 -77.1
NW25-56 330 569136 5619642 442 208 -44.8
NW25-57 408 569223 5619597 452 215 -60.9
NW25-58 393 569304 5619458 429 217 -73.9
NW25-59 489 569274 5619534 440 115 -84.3
NW25-60 375 569304 5619458 429 246 -73.1
NW25-61 399 569226 5619597 452 228 -60.5
NW25-62 462 569274 5619540 441 239 -85.3
NW25-63 378 569223 5619602 453 234 -52.5
Coordinates are reported in UTM Zone 9 North (NAD83 CRS, VD CVG28BC), with units in metres
Northisle Copper and Gold Inc. | 14th Floor – 1040 West Georgia St. | Vancouver, BC | V6E 4H1
www.northisle.ca | [email protected]
Figure 1 shows a map of the overall North Island Project including existing deposits, key prospects , and the focus
area of this release.
Figure 1: North Island Project Showing Location of Deposits and Prospects
Figure 2 shows the location of the drill holes announced in this press release in context with previous drilling in the
Northwest Expo area, while Figure 3 presents a long-section highlighting results from this release, illustrating the
distribution of drilling and mineralized intervals along the deposit.
Northisle Copper and Gold Inc. | 14th Floor – 1040 West Georgia St. | Vancouver, BC | V6E 4H1
www.northisle.ca | [email protected]
Figure 2: Northwest Expo Area Drilling Showing Results from This Release and Historic Holes
Northisle Copper and Gold Inc. | 14th Floor – 1040 West Georgia St. | Vancouver, BC | V6E 4H1
www.northisle.ca | [email protected]
Figure 3: Section View Highlighting Results from This Release and Select Previous Drilling
Exploration and Development Milestones
Key project milestones for 2026 include the following:
• COMPLETED – Updated Preliminary Economic Assessment on North Island Project
• COMPLETED – C$39.5 million financing
• COMPLETED – BC Hydro Conceptual Review of Interconnection
• COMPLETED – Team additions and enhancements to support growth
• COMPLETED – Commencement of expanded baseline study program to support EA Readiness
• COMPLETED – Largest ever field program at North Island Project with 20,297 metres and 58 holes drilled
• COMPLETED – Confirmed mineralization at West Goodspeed over 1.2km strike
• COMPLETED – Identified copper-gold mineralization at the Cougar Target
• COMPLETED – C$115 million financing to advance the North Island Project
• COMPLETED – Infill drilling results at Northwest Expo, extending strike and highlighting higher-grade zones
• Q2 2026 – Infill drilling results (5,516 metres in total) at Red Dog (pending assay results)
• Q2 2026 – Initial metallurgical test results for the North Island PFS
• Q2 2026 – Integrated resource update for the North Island Project
• Q2 2026 – Commence extension drilling in Northwest Corridor
• Q3 2026 – Target for initiation of early engagement on mine waste storage area
• Q3 2026 – Initiate drilling at regional exploration targets
• Q4 2026 – Results from drilling at regional exploration targets
• Q4 2026 – North Island PFS results announced
• H2 2026 – Initial Project Description filed
• H2 2026 – Commence BC Hydro System Impact Study
• Ongoing – Continued positive engagement with indigenous rightsholders and local stakeholders
• Ongoing – Additional team additions to support further growth