San Lorenzo Commences Next Phase Drilling Program Within Multiple Target Zones at Salvadora GOLD-Copper Property, Chile
SAN LORENZO COMMENCES NEXT PHASE DRILLING PROGRAM WITHIN MULTIPLE TARGET ZONES AT
SALVADORA GOLD-COPPER PROPERTY, CHILE
CALGARY / September 24th, 2025 / San Lorenzo Gold Corp. ("San Lorenzo" or the "Company") (TSXV: SLG)
is pleased to announce that the next phase of diamond drilling is commencing at the Cerro Blanco and Arco
de Oro targets on its flagship Salvadora property. Salvadora lies 15 kilometres from the world-class El
Salvador copper-gold (Cu-Au) porphyry deposit and mine within Chile’s prolific mega-porphyry belt in Region
III, Chile. With permits in place, San Lorenzo’s field team and construction crews are on site building the
access road and preparing the pad for the first hole at Cerro Blanco.
News Release Highlights:
Permits are in place and construction of access road and pads started.
San Lorenzo will drill at least three holes at Cerro Blanco and at least four holes at Arco de Oro.
Holes are targeted based on recently completed Induced Polarization surveys at both areas.
Past drilling at Salvadora has proven that IP chargeability is a highly effective targeting tool, with gold
accompanying sulphide concentrations that generate the chargeability highs.
Drilling will target the highest amplitude chargeability anomalies yet identified at Cerro Blanco.
The maiden drill program at Cerro Blanco reported significant gold intercepts from all three holes (up
to 153 metres grading 1.04 g/t gold in SAL 01-24) which were collared approx. 500 metres apart.
Cerro Blanco is a large alteration zone spanning at least 1.5 kilometres in width.
Arco de Oro is a 5+ kilometer trend of high-grade epithermal gold/silver veining, traceable at surface
by numerous historic surface workings.
Past drilling at Arco de Oro has generated several high-grade intercepts with a highlight intercept of
23.3 metres grading 4.83 g/t gold, including 4 metres grading 17.95 g/t gold in hole SAL 01-25.
Drilling at Arco de Oro will target new chargeability anomalies from the 2025 IP survey, with new
holes located up to 3.9 kilometres from previous drilling.
Further details are provided below
Figure 1: San Lorenzo’s Salvadora Property with Arco de Oro and Cerro Blanco Target areas highlighted
Cerro Blanco Drilling Program Details
The 2024 reconnaissance drilling program at Cerro Blanco consisted of three wide-spaced holes that were
situated approximately 500 metres apart. Those holes confirmed a large-scale, gold-bearing system (See
Table 1). The upcoming program will focus on drilling targets identified in the 2025 Induced Polarization
(“IP”) survey recently completed. The first hole will target IP line C5 (Section A-A’, Figure 3) followed by
two holes are planned along IP Line C2 (Section B-B’, Figure 6)
Hole # From (m) To (m) Width (m) Au (g/t) Ag (g/t) Cu (%)
Sal 01-24 229 382.5 153.5 1.04 1 0.05
Including 290.5 382.5 92 1.38 1.1 0.06
Including 331.7 335.5 3.8 12.78 6.5 0.51
Sal 02-24 179 264.7 85.7 1.02 0.3 0.06
Including 179 246.7 67.7 1.15 0.2 0.06
Including 183.1 187.1 4 8.14 0.5 0.16
Sal 03-24 226 250 24 1.28 1.1 0.11
Table 1: Table of Historical Drill Results at Cerro Blanco
Figure 2: Loca Ɵons of historical and planned drillholes with 2018 and 2025 IP lines shown and highligh Ɵng IP
chargeability areas (in pink). Pictured is the altera Ɵon visible from the valley floor that is on trend with the
anomalies trending to the NE from SAL 01-24 and SAL 02-24.
Cerro Blanco IP Results – Past (2018) and New (2025) Lines
The first hole of the upcoming program is planned to link the mineraliza Ɵon in SAL 01-24 and SAL 02-24 on
the southernmost IP line with a very strong anomaly evident on the recent infill line (C5) immediately to the
north (Figures 2 and 3) and another very strong anomaly on the old (2018) northernmost IP line (C2-2, Figure
4).
Holes two and three will target an extension of the anomaly iden Ɵfied through a western extension to old
(2018) line C2-1 (Figure 2).
The Cerro Blanco target is currently interpreted to host two separate corridors that “wrap around” the litho-
cap evident at surface. Each exhibit large high-chargeability anomalies. If mineralizaƟon is intersected within
or adjacent to these chargeability highs, the Cerro Blanco system has the poten Ɵal to host mineralized rock
up to 1.7 km in strike length in the northeasterly orientaƟon from holes SAL 01-24 and SAL 02-24 and would
exceed 1.0 km of strike length in a northwesterly direc Ɵon from those same holes on the southernmost IP
lines. AddiƟonal holes at Cerro Blanco may be drilled as part of the upcoming program. If so, further details
will be provided as plans for are finalized.
Figure 3: Cross-secƟon A-A' showing chargeability (mV/V) on IP line C5 and showing proposed drillhole 1
targeƟng a high-chargeability feature.
Figure 4: Cross-secƟon showing chargeability (mV/V) on IP line C2-2 – a 2018 IP line that contained the strongest
anomaly that has not yet been drilled due to surface access issues.
Previous drilling conducted by San Lorenzo at Cerro Blanco has established a close relationship between
moderate-to-high IP chargeability anomalies and gold mineralization. IP data at Cerro Blanco shows
moderate-to-high chargeability spatially correlated with long gold intervals in SAL 01-24 and SA 02-24 (Figure
5). SAL 01-24 ended in mineralization and exhibited an increasing chalcopyrite to pyrite ratio downhole. All
holes at Cerro Blanco in the upcoming program will aim to drill through chargeability anomalies to continue
to confirm correlation of gold mineralization with notable chargeability features.
SAL 03-24 further demonstrated the mineraliza Ɵon–chargeability link (Figure 6). This persistent correla Ɵon
underscores IP as an effecƟve targeƟng tool on the property. Two step-out holes (Proposed Drillholes 2 & 3)
are planned on a westerly extension to line C2-1 to test the broad chargeability highs west of SAL 03-24 which
may or may not be interconnected with the anomaly tested by SAL 03-24.
Figure 5: Cross-secƟon C-C' showing chargeability (mV/V) on IP line C1 and the mineralized intersec Ɵons of SAL
01-24 and SAL 02-24 – illustraƟng the relaƟonship between moderate-to-high IP chargeability data collected in
2018 by San Lorenzo and gold mineralizaƟon.
Figure 6: Cross-secƟon B-B’' showing chargeability (mV/V) on IP line C2-1 including results of hole SAL 03-24
overlain and showing the locaƟons of Proposed Drillholes 2 and 3.
VP Terry Walker commented, “We are thrilled that the western extension to line C2 exhibits such a wide
anomaly. With SAL 03-24 having already penetrated the anomaly 300 metres east of our upcoming
locations, and having obtained gold intercepts from that hole, we have increased confidence that exciting
results will be returned from these holes”.
Mr. Walker continued: “The anomaly visible on line C5 is particularly interesting in that it is the strongest
anomaly we’ve observed to date on our limited IP surveys. It lies on trend with the strongest anomaly we
saw on our initial IP program completed during 2018. Drilling that strongest anomaly shown in the 2018
program was a high priority for the last drilling program completed earlier this year, but access issues made
drilling there difficult. Having its existence reconfirmed with the very strong anomaly on the new middle IP
line (C5) and the fact that it is in an area where access is simpler means that we are now able to drill the
feature. We are excited to get drilling on Cerro Blanco as soon as we can”.
Arco de Oro Drilling Program Details
The Arco de Oro North-West Extension
IP recently completed (May 2025) over the NW Extension of Arco De Oro (Line D8; Section D-D’; Figure 8
and Line D5; Section E-E’; Figure 9) identified numerous strong chargeability anomalies supported by
artisanal workings at surface. Line D8 is in excess of 3.9 km along strike to the northwest of San Lorenzo’s
earlier drilling at Arco de Oro – in the Arco de Oro “core zone”. Previous work on the trend included the
drilling of SAL 01-25 and SAL 04-22. Assay results from SAL 01-25 and SAL 04-22 – drilled in the Arco de Oro
“core zone” are presented below in Table 2.
Hole # From (m) To (m) Width (m) Au (g/t) Ag (g/t) Cu (%)
SAL-01-25 15.7 22.2 6.6 5.61 0.6 0.06
Including 15.7 18 2.3 11.14 0.8 0.13
And 110 119.7 9.7 4.4 2.3 0.16
Including 117 118.4 1.4 12.2 3.2 0.11
And 151.1 174.4 23.3 4.8 4.2 0.16
Including 152.8 156.8 4 17.95 8.3 0.32
SAL-04-22 329 351.5 22.5 4.74 3.6 0.18
Including 333 339.5 6.5 16.27 9.9 0.39
Including 335.5 337 1.5 58.18 15.7 0.38
Table 2. Results for Hole SAL-01-25 and SAL -04-22 in the Arco de Oro “core zone”.
IP lines D8 and D5 were surveyed during the 2025 IP program completed in May 2025 to collect data on a
NW extension to the known Arco de Oro trend. Of note, surface artisanal workings continue from the
Arco de Oro core zone all the way to the NW extension area. Three moderate-high chargeability features
are present on IP line D8 and one moderate-high chargeability feature is present on IP line D5. These will
be targeted in the upcoming drilling campaign (Figures 7, 8 and 9).