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Reporting assumptions

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Ownership basis

Show the full project inventory before ownership adjustment.

Display scale

Display contained quantities in millions of ounces or tonnes.

Resource treatment

Normalise Resources to exclude Reserves: where a project is flagged inclusive, net Reserves out of Resources so the figure is additional Resources beyond Reserves. Unknown-convention rows are shown as stated.

Resource total

Total Resource includes Inferred (JORC convention). Totals are re-derived from category rows wherever the document discloses them.

Recovery basis

Show the issuer's headline recoverable figure as reported. Lithium-brine reserves already have the brine-processing recovery factor applied; everything else is shown as stated.

Commodity view

Primary view: each commodity in its own contained unit (oz / t).

Marmato

Colombia · ProducingUnverified

Current R&R by category

Whole-project rollup at the latest vintage per category: printed project-level rows are preferred, and mining areas are summed (tonnes-weighted grade) only where the issuer prints no project-level row. Per-area and per-source detail in the Current R&R table below.

Au

Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	As at
Measured	2.80 Mt	6.04 g/t	0.55 Moz	30 June 2022
Indicated	58.70 Mt	2.89 g/t	5.45 Moz	30 June 2022
Inferred	35.60 Mt	2.43 g/t	2.79 Moz	30 June 2022
Total Resources	34.55 Mt	2.19 g/t	2.43 Moz	30 June 2022
Proved	2.20 Mt	4.31 g/t	0.30 Moz	30 June 2022
Probable	29.08 Mt	3.08 g/t	2.87 Moz	30 June 2022
Total Reserves	31.28 Mt	3.16 g/t	3.18 Moz	30 June 2022

Sub-category rows are as disclosed (no Reserves-treatment netting); the Total rows honour the Resources treatment and Inferred-policy toggles, so components may not sum to the Total.

Dotted tonnes/grade are derived under the active Resources treatment: tonnes are netted of (or grossed by) the reserve tonnage alongside contained, and grade is re-derived as netted contained ÷ netted tonnes — not the published figures.

Ag

Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	As at
Measured	2.80 Mt	27.80 g/t	2.51 Moz	30 June 2022
Indicated	58.70 Mt	6.20 g/t	11.76 Moz	30 June 2022
Inferred	35.60 Mt	3.20 g/t	3.68 Moz	30 June 2022
Total Resources	34.55 Mt	5.11 g/t	5.68 Moz	30 June 2022
Proved

Cut-off grade

1.8000 g/t Au · 1.8000 g/t Ag · 1.3000 g/t Au · 1.3000 g/t Ag · 2.0500 g/t Au · 2.0500 g/t Ag · 1.6200 g/t Au · 1.6200 g/t Ag

Price assumption

US$1700.00/oz · US$1500.00/oz

JORC code year

—

Peer benchmark — producing Au projects (282 with resources)Resource size P81Resource grade P73View on grade-tonnage chart →

Percentile of this project's current total Resource among covered peers (P100 = largest / highest grade). Basis and Inferred toggles apply.

Data quality

Latest source: 40-F: 40-F — arismining-2026aifv3.htm (AIF, backfilled exhibit) · 30 June 2022
Reporting code: SK-1300
Convention: inclusive
Currency assumption: US$
Disagreement flags: 3 rows

Current R&R

Resources

Area	Category	Tonnes (Mt)	Au		Ag		As at	Source	Provenance
Area	Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	Grade (g/t Ag)	Contained (Moz Ag)	As at	Source	Provenance
Total	Measured	2.80 Mt	6.04 g/t	0.55 Moz	27.80 g/t	2.51 Moz	30 June 2022	Table 6.2.1 Marmato mineral resources effective June 30, 2022 — Marmato Total row

Reserves

Area	Category	Tonnes (Mt)	Au		Ag		As at	Source	Provenance
Area	Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	Grade (g/t Ag)	Contained (Moz Ag)	As at	Source	Provenance
Total	Proved	2.20 Mt	4.31 g/t	0.30 Moz	16.40 g/t	1.16 Moz	30 June 2022	Table 6.2.2 Marmato mineral reserves effective June 30, 2022 — Marmato Total rowUnverified Evidence record Marmato Proved · Au · as at 2022-06-30 Reported figure Area Whole project Basis 100% Ore tonnes (t) 2195500.0000 Grade 4.3100 Contained (oz) 304000.0000 Classification Reserve Source trail 40-F: 40-F — arismining-2026aifv3.htm (AIF, backfilled exhibit) Table 6.2.2 Marmato mineral reserves effective June 30, 2022 — Marmato Total row Published 2026-03-11 Verification Approved; not independently verified · Model extracted tranche11c QA: verified against printed source table Copies a pre-filled issue record so you can send it through your normal channel.	notes (4) Source: 40-F: 40-F — arismining-2026aifv3.htm (AIF, backfilled exhibit) · published 11 Mar 2026 Ref: Table 6.2.2 Marmato mineral reserves effective June 30, 2022 — Marmato Total row SK-1300 — Reporting code of record: SK-1300 Cutoff 2.05 g/t Au — Cut-off grade assumption from the source statement. @ US$ 1,500/oz — Metal price assumption used to derive this estimate. QA notes: tranche11c QA: verified against printed source table
Total	Probable	29.08 Mt	3.08 g/t	2.87 Moz	5.30 g/t	4.98 Moz	30 June 2022	Table 6.2.2 Marmato mineral reserves effective June 30, 2022 — Marmato Total rowUnverified Evidence record Marmato Probable · Au · as at 2022-06-30 Reported figure Area Whole project Basis 100% Ore tonnes (t) 29081800.0000 Grade 3.0800 Contained (oz) 2874000.0000 Classification Reserve Source trail 40-F: 40-F — arismining-2026aifv3.htm (AIF, backfilled exhibit) Table 6.2.2 Marmato mineral reserves effective June 30, 2022 — Marmato Total row Published 2026-03-11 Verification Approved; not independently verified · Model extracted tranche11c QA: verified against printed source table Copies a pre-filled issue record so you can send it through your normal channel.	notes (4) Source: 40-F: 40-F — arismining-2026aifv3.htm (AIF, backfilled exhibit)
Total	Total Reserves	31.28 Mt	3.16 g/t	3.18 Moz	6.10 g/t	6.14 Moz	30 June 2022	Table 6.2.2 Marmato mineral reserves effective June 30, 2022 — Marmato Total Proven + ProbableUnverified Evidence record Marmato Total Reserve · Au · as at 2022-06-30 Reported figure Area Whole project Basis 100% Ore tonnes (t) 31277300.0000 Grade 3.1600 Contained (oz) 3178000.0000 Classification Reserve Source trail 40-F: 40-F — arismining-2026aifv3.htm (AIF, backfilled exhibit) Table 6.2.2 Marmato mineral reserves effective June 30, 2022 — Marmato Total Proven + Probable Published 2026-03-11 Verification Approved; not independently verified · Model extracted tranche11d QA: verified against printed source table Copies a pre-filled issue record so you can send it through your normal channel.	notes (4)
Lower Mine	Probable	24.14 Mt	2.87 g/t	2.22 Moz	3.50 g/t	2.71 Moz	30 June 2022	Table 6.2.2 Marmato mineral reserves effective June 30, 2022Unverified Evidence record Marmato Probable · Au · as at 2022-06-30 Reported figure Area Lower Mine Basis 100% Ore tonnes (t) 24135000.0000 Grade 2.8700 Contained (oz) 2224000.0000 Classification Reserve Source trail 40-F: 40-F — arismining-2026aifv3.htm (AIF, backfilled exhibit) Table 6.2.2 Marmato mineral reserves effective June 30, 2022 Published 2026-03-11 Verification Approved; not independently verified · Model extracted tranche11c QA: verified against printed source table Copies a pre-filled issue record so you can send it through your normal channel.	notes (4) Source: 40-F: 40-F — arismining-2026aifv3.htm (AIF, backfilled exhibit)
Lower Mine	Total Reserves	24.14 Mt	2.87 g/t	2.22 Moz	3.50 g/t	2.71 Moz	30 June 2022	Table 6.2.2 Marmato mineral reserves effective June 30, 2022Unverified Evidence record Marmato Total Reserve · Au · as at 2022-06-30 Reported figure Area Lower Mine Basis 100% Ore tonnes (t) 24135000.0000 Grade 2.8700 Contained (oz) 2224000.0000 Classification Reserve Source trail 40-F: 40-F — arismining-2026aifv3.htm (AIF, backfilled exhibit) Table 6.2.2 Marmato mineral reserves effective June 30, 2022 Published 2026-03-11 Verification Approved; not independently verified · Model extracted tranche11d QA: verified against printed source table Copies a pre-filled issue record so you can send it through your normal channel.	notes (4) Source: 40-F: 40-F — arismining-2026aifv3.htm (AIF, backfilled exhibit)
Upper Mine	Proved	2.20 Mt	4.31 g/t	0.30 Moz	16.40 g/t	1.16 Moz	30 June 2022	Table 6.2.2 Marmato mineral reserves effective June 30, 2022Unverified Evidence record Marmato Proved · Ag · as at 2022-06-30 Reported figure Area Upper Mine Basis 100% Ore tonnes (t) 2195500.0000 Grade 16.4000 Contained (oz) 1157000.0000 Classification Reserve Source trail 40-F: 40-F — arismining-2026aifv3.htm (AIF, backfilled exhibit) Table 6.2.2 Marmato mineral reserves effective June 30, 2022 Published 2026-03-11 Verification Approved; not independently verified · Model extracted tranche11c QA: verified against printed source table Copies a pre-filled issue record so you can send it through your normal channel.	notes (4) Source: 40-F: 40-F — arismining-2026aifv3.htm (AIF, backfilled exhibit)
Upper Mine	Probable	4.95 Mt	4.09 g/t	0.65 Moz	14.30 g/t	2.27 Moz	30 June 2022	Table 6.2.2 Marmato mineral reserves effective June 30, 2022Unverified Evidence record Marmato Probable · Ag · as at 2022-06-30 Reported figure Area Upper Mine Basis 100% Ore tonnes (t) 4946900.0000 Grade 14.3000 Contained (oz) 2273000.0000 Classification Reserve Source trail 40-F: 40-F — arismining-2026aifv3.htm (AIF, backfilled exhibit) Table 6.2.2 Marmato mineral reserves effective June 30, 2022 Published 2026-03-11 Verification Approved; not independently verified · Model extracted tranche11c QA: verified against printed source table Copies a pre-filled issue record so you can send it through your normal channel.	notes (4) Source: 40-F: 40-F — arismining-2026aifv3.htm (AIF, backfilled exhibit)
Upper Mine	Total Reserves	7.14 Mt	4.16 g/t	0.95 Moz	14.90 g/t	3.43 Moz	30 June 2022	Table 6.2.2 Marmato mineral reserves effective June 30, 2022Unverified Evidence record Marmato Total Reserve · Au · as at 2022-06-30 Reported figure Area Upper Mine Basis 100% Ore tonnes (t) 7142300.0000 Grade 4.1600 Contained (oz) 954000.0000 Classification Reserve Source trail 40-F: 40-F — arismining-2026aifv3.htm (AIF, backfilled exhibit) Table 6.2.2 Marmato mineral reserves effective June 30, 2022 Published 2026-03-11 Verification Approved; not independently verified · Model extracted tranche11d QA: verified against printed source table Copies a pre-filled issue record so you can send it through your normal channel.	notes (4) Source: 40-F: 40-F — arismining-2026aifv3.htm (AIF, backfilled exhibit)