MGG Hits 1,469 g/t AgEq at San Jose as Resource Expansion Drilling Delivers

Minaurum Just Hit Silver Grades Above 2,400 g/t AgEq And These Zones Aren’t Even in the Resource Yet

  • A monster hit at San Jose: Hole AL26-249 returned 0.50 m of 2,425 g/t AgEq (1,910 g/t Ag, 0.43 g/t Au, 3.90% Cu, 4.71% Zn)… that’s nearly 2 kilograms of silver per tonne.
  • Two brand-new zones headed into the resource: Quintera and Europa Sur were excluded from Minaurum’s maiden resource estimate… and both are now delivering high-grade continuity that will be incorporated into the upcoming resource update.
  • Step-outs keep working: 3.40 m of 397 g/t AgEq (incl. 0.30 m of 1,433 g/t AgEq) at Europa Sur, and 0.50 m of 1,559 g/t AgEq at Quintera… roughly 100 m down-dip of the previously reported 5.95 m of 1,117 g/t AgEq.
  • A new discovery front opens: Promontorio Sur received its first-ever step-out drilling and hit immediately… 0.45 m of 386 g/t AgEq inside a 6 m-wide vein zone, along a structure traceable for more than 1 kilometre. Drilling continues with assays pending.
  • Growth on top of growth: These results come from an aggressive, fully active Phase II 50,000-metre resource-expansion program at the 100%-owned, production-permitted Alamos Silver Project in Sonora, Mexico.
  • The kicker: Multiple intercepts carry meaningful gold and copper credits alongside silver… and more assays are pending from several zones right now.
TSXV: MGG  •  OTCQX: MMRGF  •  FSE: 78M0

Minaurum Resource Step-Out Drilling Returns: 3.40 m of 397 g/t AgEq at Europa Sur, 1.90 m of 323 g/t AgEq at Quintera, and 0.90 m of 1,469 g/t AgEq at San Jose in Alamos Silver Project

September 24, 2026 • 8:45 AM EDT

Vancouver, British Columbia – September 24, 2026 – Minaurum Silver Inc. (TSXV: MGG) (OTCQX: MMRGF) (“Minaurum” or the “Company”) is pleased to report high-grade silver drill results from the Europa, Quintera, San Jose, and Promontorio Sur Vein Zones, as part of its ongoing Phase II, 50,000-metre resource-expansion drilling program at the Alamos Silver Project (“Alamos”) in Sonora, Mexico.

Highlights

Europa Sur Vein Zone

  • 1.60 m of 412 g/t silver equivalent (“AgEq”) (314 g/t Ag, 0.41 g/t Au, 0.42% Cu, 0.41% Pb, 0.78% Zn)
    including 0.40 m of 708 g/t AgEq (409 g/t Ag, 1.51 g/t Au, 1.27% Cu, 0.82% Pb, 1.66% Zn) (Hole AL26-233)
  • 3.40 m of 397 g/t AgEq (237 g/t Ag, 0.20 g/t Au, 0.95% Cu, 0.80% Pb, 1.87% Zn)
    including 0.30 m of 1,433 g/t AgEq (1,135 g/t Ag, 0.23 g/t Au, 2.26% Cu, 1.42% Pb, 2.36% Zn) (Hole AL26-246)

Quintera Vein Zone

  • 1.90 m of 323 g/t AgEq (263 g/t Ag, 0.02 g/t Au, 0.44% Cu, 0.27% Pb, 0.63% Zn) (Hole AL26-243)
  • 0.50 m of 1,559 g/t AgEq (1,460 g/t Ag, 0.04 g/t Au, 1.11% Cu, 0.01% Pb, 0.01% Zn) (Hole AL26-250)

San Jose Vein Zone

  • 0.90 m of 1,469 g/t AgEq (1,103 g/t Ag, 0.26 g/t Au, 2.42% Cu, 2.80% Pb, 3.35% Zn)
    including 0.50 m of 2,425 g/t AgEq (1,910 g/t Ag, 0.43 g/t Au, 3.90% Cu, 1.60% Pb, 4.71% Zn) (Hole AL26-249)

“Resource-expansion drilling continues to demonstrate the strong continuity of our high-grade silver vein zones… including Quintera and Europa Sur… while the San Jose vein delivered impressive results with silver grades exceeding 1 kg/t. Additionally, Promontorio Sur received its first round of step-out drilling, yielding encouraging initial results, with further assays to be released as they become available.”

— Darrell Rader, President and CEO
Figure 1. Plan view showing locations of Quintera, Promontorio, Europa, and San Jose vein zones.
Figure 1. Plan view showing locations of Quintera, Promontorio, Europa, and San Jose vein zones. Click to view full graphic

Quintera – Travesia Vein Zones

Drilling at Quintera is successfully defining the vertical and horizontal extent of the high-grade silver shoot both below and along strike of the historical workings. Positioned 100 to 150 metres in the hanging wall (western side) of the Quintera vein zone, the Travesia vein zone allows a single drill hole to intersect both systems. Although Quintera was excluded from Minaurum’s initial resource estimate (see news release dated January 28, 2026), it will be incorporated into the upcoming resource update.

In the Travesia vein zone, hole AL26-243 intersected 1.90 m of 323 g/t AgEq, including 0.50 m of 715 g/t AgEq (637 g/t Ag, 0.69% Cu, 0.30% Pb, 0.53% Zn). Hole AL26-236 and hole AL25-250 cut 0.65 m of 318 g/t AgEq (236 g/t Ag, 0.01 g/t Au, 0.84% Cu, 0.31% Pb, 0.10% Zn) and 0.50 m of 1,559 g/t AgEq, respectively, in the Quintera vein zone. Hole AL26-250 cuts Quintera approximately 100 m down-dip from the 5.95 m of 1,117 g/t AgEq intersection (Hole AL26-215) (see news release dated July 8, 2026), while hole AL26-236 cut the Quintera zone about 80 m to the north and 20 m higher than the AL26-250 intercept (Table 1, Figures 2, 3, and 4).

Table 1. Assay highlights for Quintera and Travesia vein zones.
← swipe to view full table →
HoleFrom
(m)
To
(m)
Interval
(m)
True Width
(m)
Ag
g/t
Au
g/t
Cu
%
Pb
%
Zn
%
AgEq
g/t
AL26-236341.70342.000.300.251620.000.450.110.02203
465.15465.800.650.502360.010.840.310.10318
491.00491.600.600.45700.110.250.271.33138
AL26-243227.80229.701.901.352630.020.440.270.63323
including227.80228.300.500.356370.000.690.300.53715
AL26-250473.35473.650.300.251120.000.260.710.38157
565.05565.550.500.401,4600.041.110.010.011,559

True widths are based on current interpretation of mineralized structures. Weight-averaged silver-equivalent grades (AgEq g/t) are based on the October 1, 2025 Long-term CIBC Global Mining Group Analyst Consensus Commodity Price Forecast: Ag $29.73/tr oz, Au $2,646/tr oz, Cu $4.34/lb, Pb $0.92/lb, Zn $1.21/lb. Metallurgical recovery assumption: 88.3% for Ag, 88.5% for Au, 75.5% for Cu, 83% for Pb, 75% for Zn.

Figure 2. Longitudinal section of Travesia vein zone, showing position of drill intercepts.
Figure 2. Longitudinal section of Travesia vein zone, showing position of drill intercepts. Click to view full graphic
Figure 3. Longitudinal section of Quintera vein zone, showing drill intercepts and historical workings.
Figure 3. Longitudinal section of Quintera vein zone, showing drill intercepts and historical workings. Click to view full graphic
Figure 4. Cross section of Travesia and Quintera vein zones.
Figure 4. Cross section of Travesia and Quintera vein zones, showing relationship of hole AL26-250 to hole AL26-215 and historical workings. Click to view full graphic

Promontorio Sur Vein Zone

South of the Promontorio mine, quartz-calcite veinlets with anomalous values of silver and copper cut andesitic volcanic rocks and can be traced for more than 1 km. Previous drilling reported high grades in the northern part of the Promontorio Sur vein zone adjacent to the NW-trending fault that separates it from the Promontorio zone in fault-controlled veining as well as in carbonate-replacement in limestone beneath the volcanics (see news releases dated August 22, 2019; September 24, 2024; February 13 and 27, 2025).

Step-out drilling about 200 m to the south of the NW-trending fault in Hole AL26-248 intersected 0.45 m of 386 g/t AgEq (177 g/t Ag, 0.86 g/t Au, 1.18% Cu, 0.30% Pb, 1.04% Zn) within a 6 m-wide vein zone (Table 2, Figure 2). Drilling continues at Promontorio Sur with assays pending.

Table 2. Assay highlights for Promontorio Sur vein zone.
← swipe to view full table →
HoleFrom
(m)
To
(m)
Interval
(m)
True Width
(m)
Ag
g/t
Au
g/t
Cu
%
Pb
%
Zn
%
AgEq
g/t
AL26-24883.5085.602.101.90410.510.280.170.30121
including83.5083.950.450.401770.861.180.301.04386
and85.1085.600.500.4520.930.040.330.26101

True widths are based on current interpretation of mineralized structures. Weight-averaged silver-equivalent grades (AgEq g/t) are based on the October 1, 2025 Long-term CIBC Global Mining Group Analyst Consensus Commodity Price Forecast: Ag $29.73/tr oz, Au $2,646/tr oz, Cu $4.34/lb, Pb $0.92/lb, Zn $1.21/lb. Metallurgical recovery assumption: 88.3% for Ag, 88.5% for Au, 75.5% for Cu, 83% for Pb, 75% for Zn.

Europa – Europa Sur Vein Zones

Europa Sur was not included in Minaurum’s initial resource (see news release dated January 28, 2026). Recent drilling at Europa Sur includes holes designed to intersect the upper 150–200 metres (from surface) of the structure.

Drill results to date from Europa Sur, including those in this news release, show significant potential for resource expansion outside of the central Europa vein zone (see news releases dated March 31, May 27, and July 8, 2026). Furthermore, the zone is distinct from the central part of the Europa zone for its locally higher grades of gold and copper (see news release dated May 27, 2026).

Several high-grade silver, gold and copper intercepts were returned in addition to the headline holes AL26-233 (0.40 m of 409 g/t Ag, 1.51 g/t Au, 1.27% Cu) and AL26-246 (0.30 m of 1,135 g/t Ag, 0.23 g/t Au, 2.26% Cu). AL26-253 intersected a 3.15 m interval of mineralization including 0.55 m of 298 g/t AgEq (185 g/t Ag, 0.02 g/t Au, 0.80% Cu, 0.82% Pb, 1.14% Zn). Hole AL26-232 intersected 1.80 m of mineralization which included 0.30 m of 341 g/t AgEq (261 g/t Ag, 0.01 g/t Au, 0.80% Cu, 0.31% Pb, 0.18% Zn) (Table 3, Figures 5 and 6).

Both are step-out holes approximately 80 m below and above, respectively, intersecting the pinch of the vein as indicated by the previously drilled higher grade intercept in hole AL26-225 returning 5.15 m of 392 g/t AgEq (198 g/t Ag, 0.27 g/t Au, 1.10% Cu, 1.69% Pb, 1.75% Zn) (see news release dated August 25, 2026).

Hole AL26-239 cut 2.70 m of 179 g/t AgEq (79 g/t Ag, 0.36 g/t Au, 0.27% Cu, 0.57% Pb, 1.40% Zn) including 0.30 m of 734 g/t AgEq (343 g/t Ag, 1.31 g/t Au, 1.58% Cu, 1.28% Pb, 4.80% Zn), demonstrating the potential for additional high-grade gold and copper.

Figure 5. Longitudinal section of Europa-Europa Sur vein zone.
Figure 5. Longitudinal section of Europa–Europa Sur vein zone, showing locations of highlighted mineralized intersections. Click to view full graphic
Figure 6. Cross section of Europa-Europa Sur vein zone.
Figure 6. Cross section of Europa–Europa Sur vein zone, showing locations of highlighted mineralized intersections in hole AL26-253 above and AL26-232 below AL26-225. Click to view full graphic
Table 3. Assay highlights for Europa Sur vein zone.
← swipe to view full table →
HoleFrom
(m)
To
(m)
Interval
(m)
True Width
(m)
Ag
g/t
Au
g/t
Cu
%
Pb
%
Zn
%
AgEq
g/t
AL26-232173.30173.650.350.321620.050.360.450.75224
439.45441.251.801.62870.000.380.320.29133
including439.45439.750.300.272610.010.800.310.18341
and440.65441.250.600.54880.010.500.440.42150
444.60444.900.300.271900.010.371.070.24249
AL26-233135.20136.801.601.363140.410.420.410.77412
including135.20135.600.400.344091.511.270.821.66708
170.95171.400.450.402740.060.430.290.57335
176.80177.700.900.751440.020.200.210.43177
including177.40177.700.300.253400.040.380.491.00409
238.75239.050.300.254440.080.760.450.12528
283.20283.500.300.256200.070.520.580.17686
289.90290.200.300.251660.050.190.210.14194
309.05309.350.300.254710.130.630.970.44566
AL26-234458.65459.350.700.651140.010.130.120.54141
AL26-235264.10264.400.300.281410.050.530.321.19226
AL26-237413.85414.150.300.281430.010.270.130.15173
AL26-239257.35257.650.300.258010.180.390.390.79877
268.40269.000.600.505470.120.810.570.31646
412.60415.302.702.30790.360.270.571.40179
including412.60413.801.201.051340.680.560.972.44320
which includes412.90413.200.300.253431.311.581.284.80734
418.30418.900.600.504000.330.240.631.43496
AL26-240459.40459.700.300.2557.80.030.091.002.41145
AL26-242295.00298.203.202.751590.070.150.290.61198
including296.45298.201.751.502310.110.180.430.89286
which includes297.70298.200.500.433550.160.160.460.62406
AL26-245289.95290.500.550.45990.020.250.391.84174
AL26-246143.05144.801.751.251800.030.220.400.60223
including143.05143.450.400.303030.050.350.501.20375
394.10397.503.402.502370.200.950.801.87397
including394.85395.150.300.201,1350.232.261.422.361,433
and396.20397.501.301.002620.331.631.433.02530
AL26-247160.85161.150.300.281200.030.180.300.64160
211.10211.750.650.606210.180.921.633.72837
296.20297.701.501.352230.010.140.160.16243
including296.20296.600.400.354430.020.250.160.06471
342.05342.400.350.302840.010.300.621.59361
385.20386.000.800.753750.090.780.250.95477
including385.65386.000.350.327520.181.560.421.80952
411.00416.055.054.551810.030.350.571.00248
including412.30414.001.701.553360.040.690.802.06464
and415.55416.050.500.453110.060.471.240.37390
AL26-252135.80137.151.350.95840.300.310.501.23176
AL26-253352.85356.003.152.801120.040.340.740.86180
including353.75354.300.550.501850.020.800.821.14298
and355.70356.000.300.271040.270.454.203.05324
371.80373.701.901.70750.060.470.410.29136
including373.30373.700.400.371840.111.320.660.72337
AL26-255167.65168.600.950.752350.000.200.110.07256
including167.65168.100.450.353740.000.300.180.10406

True widths are based on current interpretation of mineralized structures. Weight-averaged silver-equivalent grades (AgEq g/t) are based on the October 1, 2025 Long-term CIBC Global Mining Group Analyst Consensus Commodity Price Forecast: Ag $29.73/tr oz, Au $2,646/tr oz, Cu $4.34/lb, Pb $0.92/lb, Zn $1.21/lb. Metallurgical recovery assumption: 88.3% for Ag, 88.5% for Au, 75.5% for Cu, 83% for Pb, 75% for Zn.

San Jose Vein Zone

Hole AL26-249 demonstrated the high-grade potential of the San Jose vein zone, intersecting 0.90 m of 1,469 g/t AgEq (1,103 g/t Ag, 0.26 g/t Au, 2.42% Cu, 2.80% Pb, 3.35% Zn), including 0.50 m of 2,425 g/t AgEq (1,910 g/t Ag, 0.43 g/t Au, 3.90% Cu, 1.59% Pb, 4.71% Zn) (Table 4, Figure 7).

Figure 7. Longitudinal section of the San Jose vein zone.
Figure 7. Longitudinal section of the San Jose vein zone, showing positions of drill intercepts. Click to view full graphic
Table 4. Assay highlights for San Jose vein zone.
← swipe to view full table →
HoleFrom
(m)
To
(m)
Interval
(m)
True Width
(m)
Ag
g/t
Au
g/t
Cu
%
Pb
%
Zn
%
AgEq
g/t
AL26-231310.40311.501.100.95740.030.340.120.03109
AL26-238150.15150.750.600.5693.40.000.100.070.08106
AL26-241210.50215.505.004.001420.020.160.390.26171
including211.10211.500.400.332840.020.510.500.15343
AL26-244191.65192.000.350.3068.30.020.060.100.0479
AL26-249162.80163.700.900.851,1030.262.422.803.351,469
including163.20163.700.500.481,9100.433.901.594.712,425
AL26-251146.90147.550.650.50180.000.140.000.0130
AL26-254162.45163.200.750.681330.020.360.030.07167
275.65277.451.801.65830.010.062.181.15160
including275.65276.100.450.401650.030.053.580.91265

True widths are based on current interpretation of mineralized structures. Weight-averaged silver-equivalent grades (AgEq g/t) are based on the October 1, 2025 Long-term CIBC Global Mining Group Analyst Consensus Commodity Price Forecast: Ag $29.73/tr oz, Au $2,646/tr oz, Cu $4.34/lb, Pb $0.92/lb, Zn $1.21/lb. Metallurgical recovery assumption: 88.3% for Ag, 88.5% for Au, 75.5% for Cu, 83% for Pb, 75% for Zn.

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About Minaurum Silver Inc.

Minaurum Silver Inc. (TSXV: MGG) (OTCQX: MMRGF) (FSE: 78M0) is an Americas-focused explorer concentrating on the high-grade 100% owned, production-permitted Alamos silver project in southern Sonora, Mexico and the Lone Mountain CRD Project in Nevada, USA. Minaurum is managed by one of the strongest technical and finance teams and will continue its founders’ legacy of creating shareholder value by acquiring and developing a pipeline of Tier-One precious- and base-metal projects.

ON BEHALF OF THE BOARD
“Darrell A. Rader”
Darrell A. Rader
President and CEO

For more information, please contact:
Sunny Pannu – Investor Relations and Corporate Development Manager
1570 – 200 Burrard Street, Vancouver, BC V6C 3L6
Telephone: 1 778 330-0994
www.minaurum.com  |  info@minaurum.com

The TSX Venture Exchange does not accept responsibility for the adequacy or accuracy of this news release.

Past performance is not an indicator of future returns. NIA is not an investment advisor and does not provide investment advice. Always do your own research and make your own investment decisions. NIA is receiving compensation from MGG of US$100,000 cash for a twelve-month marketing contract and previously received US$60,000 cash for past marketing contracts which have since expired. This message is meant for informational and educational purposes only and does not provide investment advice.