(TSXV: SLG | OTC: SNLGF)
TARGET #2
Arco de
Oro
Arco de Oro is a prominent target within the Salvadora Property, characterized by multi-kilometre epithermal veining, extensive artisanal workings, and consistent high-grade gold mineralization at surface and depth.
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Key Highlights from recently completed drill program at Arco de Oro (May 8, 2026):
• Holes SAL 09-25 and SAL 10-25 intersected broad intervals of porphyry-style gold and copper mineralization at the northwest extension (“San Juan”) of the Arco de Oro trend.
• Hole SAL 10-25 returned 102.3 metres grading 1.33 g/t gold, including higher-grade intervals within the broader mineralized zone.
• The northwest extension drilling represents a 3.9 kilometre step-out from previous drilling at Arco de Oro.
• Drilling validated strong induced polarization (“IP”) anomalies interpreted as potential intrusive source centres associated with a gold-rich porphyry copper-gold system.
• Mineralization in Hole SAL 10-25 remains open at depth, with additional assay results pending below 348 metres.
Arco de Oro Holes 9 & 10Results from SAL 09 – 25 and partial results from SAL 10 – 25, holes drilled on the NW extension of the Arco de Oro trend, are presented in Tables 1 and 2 below:
ARCO DEO ORO 2024-2025 DRILL PROGRAM
High-Grade Gold Confirmed Over Multi-Kilometre Trend
Initiated a 3-hole drill program at Arco de Oro in December 2024. The goal was to step out from historical intercepts and test the expanding multi-vein epithermal system identified through surface work and IP.
Arco de Oro IP Survey
Figure 1 - Section across a portion of IP line D8 indicating the location of Holes SAL 09-25 and SAL 10-25 and depicting the mineralized intercepts obtained.
ARCO DE ORO INITIAL DRILLING SUMMARY (2016 - 2022)
Foundation for Expansion
Five diamond drill holes completed prior to 2025 confirmed consistent high-grade gold mineralization across multiple vein sets, establishing an 800 m mineralized corridor with vertical continuity to at least 290 m. These results validated San Lorenzo’s exploration model and directly informed the 2024/2025 program, which extended the strike to 1.3 km and confirmed significant expansion potential to the northwest.
ARCO DE ORO DRILL PROGRAM FINDINGS
(2025-2025)
Demonstrating Scale, Continuity & High-Grade Gold Mineralization
KEY HIGHLIGHTS
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High-grade gold intercepts confirmed over 1.3 km of strike
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Vein system remains open in all directions with strong IP correlation
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SAL 01-25 and SAL 02-25 intercepted multiple gold-bearing zones
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SAL 03-25 intersected fault-disrupted zone—further fieldwork underway
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Chargeability anomaly strengthens along trend, supporting continued expansion
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Every hole drilled at Arco de Oro to date has returned at least one significant gold intercept
“These results confirm Arco de Oro’s scale and consistency as a robust high-grade gold system. The convergence of epithermal veins along the strengthening IP anomaly points to meaningful resource potential.”– Terry Walker, VP Exploration
“Arco continues to validate our model with every drill campaign. This large, high-quality gold system is one of five exciting targets within our Salvadora property.”– Al Kroontje, CEO
TARGET LOCATION
Epithermal Gold Corridor Anchored by Surface Workings & IP Anomalies
Arco de Oro sits in the southwestern corridor of the Salvadora Property, spanning a 5 km trend marked by artisanal workings, gold-rich surface exposures, and a strengthening IP anomaly. Recent drilling confirmed vein convergence and extended mineralization to the northwest.
EXPLORATION NOTES
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Near-continuous artisanal workings confirm 5 km of structurally controlled mineralization
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Consistent high-grade gold values from surface sampling
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Multiple exploration phases since 2015, including soil/rock sampling, IP surveys, and drilling
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March–April 2025 drilling extended strike by 250 m and validated IP targeting
INVESTOR NOTES
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Arco de Oro’s accessible topography and strong surface expression allow efficient targeting and low-cost follow-up
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Drilling confirms continuity of high-grade mineralization along strike and at depth
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Upcoming IP expansion and step-o ut drilling will focus on the open northwest corridor—an area of known surface workings and geophysical support
IP SURVEY CORRELATION & EXPANSION POTENTIAL
Chargeability Anomaly Aligns with High-Grade Gold Intercepts
A 2023 IP survey outlined a strong chargeability anomaly aligning with high-grade intercepts, supporting the model of converging epithermal veins trending northwest. 2024 IP surveying expanded the geophysical coverage in a North West direction on the Arco de Oro epithermal target.
EXPLORATION NOTES
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IP anomaly begins ~150 m depth, open at depth and NW
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Aligns with sulphide-hosted gold in Holes SAL 04-22 & SAL 01-25
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SAL 01-25: 23.3 m @ 4.8 g/t Au, incl. 4.0 m @ 17.95 g/t Au
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Geophysics and drilling suggest vein convergence and system growth NW
INVESTOR NOTES
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Every hole to date has returned gold mineralization
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5 km trend with large untested areas to the NW
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IP-guided targeting supports further high-grade discovery potential
HISTORICAL MINING & SURFACE WORKINGS
A Well-Mineralized Corridor with a Legacy of Artisanal Activity
The map to the left outlines the locations of extensive historical mine workings within the Arco de Oro trend.
EXPLORATION NOTES
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Multiple small-scale workings, adits, and trenches suggest long-standing local knowledge of gold and copper mineralization.
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Sampling from these areas confirms the presence of gold and copper-enriched zones.
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The Santa Cecilia adit and surrounding workings illustrate the scale and accessibility of the system, supporting the case for broader development.
SUMMARY & NEXT STEPS
Key Takeaways
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Major Step-Out Success: Holes SAL 09-25 and SAL 10-25 were drilled approximately 3.9 km from the nearest previous hole, significantly expanding the known footprint of the Arco de Oro system.
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Emerging Large-Scale Porphyry Discovery: Results suggest San Lorenzo may have intersected the upper levels of a gold-rich porphyry copper-gold system, highlighting substantially greater scale potential in the newly identified “San Juan” area.
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Strong Discovery Momentum: The results support immediate follow-up drilling, with assays from an additional 5½ drill holes still pending, providing significant near-term discovery and expansion upside.
NEXT STEPS
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San Lorenzo expects assay results from the 5 ½ holes that have already been drilled on Arco de Oro – upon which assay results are not yet available – to be reported on a regular basis. San Lorenzo is committed to providing stakeholders with regular updates as assay results are obtained.
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San Lorenzo has finalized the permitting material for the upcoming Phase 7 drilling program at Salvadora. The process of construction followed by rig mobilization is expected to commence within approximately 30 days.