Antamina (Compañía Minera Antamina S.A.)
NI 43-101 Technical Report on Antamina Mining Operation, Peru
Identity and ownership
- Operator
- Compañía Minera Antamina S.A. (Minera Antamina)highAntamina NI 43-101 (p.1-1), p.1-1 — as of 2024-12-31
- Jurisdiction
- Peru — San Marcos District, Huari Province, Ancash Department (~270 km north of Lima)highAntamina NI 43-101 (p.1-3), p.1-3 — as of 2024-12-31
- Primary commodity
- Copper and zinchighAntamina NI 43-101 (p.1-6 to 1-9), p.1-6 — as of 2024-12-31
- Deposit type
- Giant Cu-Zn(-Mo-Ag) skarn, zoned outward from porphyry centres (brown-garnet endoskarn through green-garnet skarn)highAntamina NI 43-101 (Section 7, p.7-1 to 7-23), p.7-1 — as of 2024-12-31
- First production
- 2001highNS Energy — Antamina copper and zinc mine — as of 2001
- Years in operation
- 25derived from first production year
Disclosed interests
- Interest 1
- BHP Group Ltd — 33.75%highAntamina NI 43-101 (p.1-1), p.1-1 — as of 2024-12-31
- Interest 2
- Glencore plc — 33.75%highAntamina NI 43-101 (p.1-1), p.1-1 — as of 2024-12-31
- Interest 3
- Teck Resources Ltd (via Teck Base Metals Ltd) — 22.50%highAntamina NI 43-101 (p.1-1), p.1-1 — as of 2024-12-31
- Interest 4
- Mitsubishi Corporation — 10.00%highAntamina NI 43-101 (p.1-1), p.1-1 — as of 2024-12-31
Byproduct and co-product commodities
- Byproduct 1
- Molybdenum, silver, lead/bismuthhighAntamina NI 43-101 (p.1-6 to 1-9), p.1-6 — as of 2024-12-31
Reported production
| Metal | Quantity | Basis | Period | Source |
|---|---|---|---|---|
| Copper | 85900 t | attributable | FY2025 (year to 31 Dec 2025) (Teck 22.5% attributable share) | Teck 2025 Production and Sales Updatehigh |
| Zinc in concentrate | 102300 t | attributable | FY2025 (year to 31 Dec 2025) (Teck 22.5% attributable share) | Teck 2025 Production and Sales Updatehigh |
Public technical reporting
NI 43-101 (primary) — NI 43-101 Technical Report on Antamina Mining Operation, Peru, 2025, filed by Teck Resources Limited (filed on SEDAR+ 19 Feb 2025) on SEDAR+highNI 43-101 Technical Report on Antamina Mining Operation, Peru
Canada (TSX / TSX-V) · expected language: Mineral Resource / Mineral Reserve
Reported mineral resource and reserve
| Category | Tonnes | Grade | Contained | Cut-off | As of | Source |
|---|---|---|---|---|---|---|
| Proven | 198 Mt (Cu; 100% basis; Zn 0.12%; Ag 8.1 g/t; Mo 0.029%) | 0.82 % Cu | — | — | 2024-12-31 | Antamina NI 43-101, Table 1-3, Table 1-3 |
| Proven | 50 Mt (Cu-Zn; 100% basis; Zn 1.88%; Ag 18.1 g/t; Mo 0.011%) | 1.02 % Cu | — | — | 2024-12-31 | Antamina NI 43-101, Table 1-3, Table 1-3 |
| Probable | 190 Mt (Cu; 100% basis; Zn 0.15%; Ag 9.4 g/t; Mo 0.03%) | 0.91 % Cu | — | — | 2024-12-31 | Antamina NI 43-101, Table 1-3, Table 1-3 |
| Probable | 113 Mt (Cu-Zn; 100% basis; Zn 1.99%; Ag 19.2 g/t; Mo 0.008%) | 1.07 % Cu | — | — | 2024-12-31 | Antamina NI 43-101, Table 1-3, Table 1-3 |
| Proven+Probable | 550 Mt (Combined; 100% basis; Zn 0.67%; Ag 11.7 g/t; Mo 0.023%) | 0.92 % Cu | — | — | 2024-12-31 | Antamina NI 43-101, Table 1-3, Table 1-3 |
| Measured | 86 Mt (Cu; 100% basis; Zn 0.09%; Ag 6.5 g/t; Mo 0.014%; exclusive/inclusive basis per report Table 1-1) | 0.66 % Cu | — | — | 2024-12-31 | Antamina NI 43-101, Table 1-1, Table 1-1 |
| Indicated | 150 Mt (Cu; 100% basis; Zn 0.13%; Ag 8.6 g/t; Mo 0.021%) | 0.78 % Cu | — | — | 2024-12-31 | Antamina NI 43-101, Table 1-1, Table 1-1 |
| Inferred | 587 Mt (Cu; 100% basis; Zn 0.14%; Ag 8.3 g/t; Mo 0.024%) | 0.88 % Cu | — | — | 2024-12-31 | Antamina NI 43-101, Table 1-1, Table 1-1 |
| Inferred | 282 Mt (Cu; 100% basis; Zn 0.2%; Ag 10.8 g/t; Mo 0.017%) | 1.23 % Cu | — | — | 2024-12-31 | Antamina NI 43-101, Table 1-2, Table 1-2 |
Figures are quoted from the filing named beside each row and are not restated, converted or aggregated here.
Processing and metallurgy
- Process route
- not stated
- Reported recovery
- 92% Cu, 79% Ag, 46% Mo
- Processing language used in the filing
- none of that family used
- Deleterious elements named
- none stated
Cu geometallurgical ore: average recovery 92% Cu, 79% Ag, 46% Mo. Cu-Zn ore: 83% Cu, 84% Zn, 60% Ag. Overall Cu recovery range 73.72-93.40%, Zn 72.48-83.70%.
Antamina NI 43-101 (p.1-6 to 1-7), p.1-6- Process route
- not stated
- Reported recovery
- Molybdenum recovery is comparatively low (~46% in Cu ore); no Mo recovery reported from Cu-Zn ore
- Processing language used in the filing
- none of that family used
- Deleterious elements named
- As, Bi
Deleterious elements bismuth and arsenic, managed by selective campaigning of geometallurgical ore types. Molybdenum recovery is comparatively low (~46% in Cu ore); no Mo recovery reported from Cu-Zn ore.
Antamina NI 43-101 (p.1-6 to 1-7), p.1-6- Process route
- flotation
- Reported recovery
- not stated
- Processing language used in the filing
- none of that family used
- Deleterious elements named
- none stated
Processing method: SAG + ball mill comminution then flotation, producing separate Cu, Zn, Mo and Pb/Bi concentrates; Cu/Zn concentrate piped 302 km to Punta Lobitos (Huarmey). Tailings impoundment adjacent to the mill; reclaim water reused.
NS Energy — AntaminaAssessment
The 2024 NI 43-101 (effective 31 Dec 2024, filed by Teck on SEDAR+) reports 550 Mt of proven and probable reserves at 0.92% Cu, 0.67% Zn, 11.7 g/t Ag and 0.023% Mo, with plant recoveries of ~92% Cu and ~46% Mo in copper ore and ~84% Zn in copper-zinc ore. Public resource reporting characterises grade, tonnage and bulk-flotation recovery; it is not designed to resolve element deportment by mineral phase, nor where the unrecovered molybdenum, the unrecovered silver, or byproduct metals such as bismuth and selenium report across the concentrate, tailings and residue streams. Whether value resists conventional flotation or reports to tailings at a skarn of this scale is a testable question that a DETECT characterisation is built to answer. Element deportment by mineral phase is not resolved in the public reporting located, and the figures here are machine-extracted from the cited filings and not yet independently verified.
Screening signals
Each item below is something a cited source states. Nothing here asserts that unrecovered material is present.
Reported metallurgical recovery is 92% Cu, 79% Ag, 46% Mo.
92% Cu, 79% Ag, 46% Mo
Antamina NI 43-101 (p.1-6 to 1-7), p.1-6Reported metallurgical recovery is Molybdenum recovery is comparatively low (~46% in Cu ore); no Mo recovery reported from Cu-Zn ore.
Molybdenum recovery is comparatively low (~46% in Cu ore); no Mo recovery reported from Cu-Zn ore
Antamina NI 43-101 (p.1-6 to 1-7), p.1-6The filing names As among the deleterious elements in the feed.
As
Antamina NI 43-101 (p.1-6 to 1-7), p.1-6The filing names Bi among the deleterious elements in the feed.
Bi
Antamina NI 43-101 (p.1-6 to 1-7), p.1-6Molybdenum, silver, lead/bismuth is named as a byproduct or co-product commodity, and the resource statement located carries no grade or contained-metal figure for it.
Molybdenum, silver, lead/bismuth
Antamina NI 43-101 (p.1-6 to 1-9), p.1-6The deposit is described as Giant Cu-Zn(-Mo-Ag) skarn, zoned outward from porphyry centres (brown-garnet endoskarn through green-garnet skarn). Porphyry systems are documented as commonly carrying molybdenum, gold, silver, rhenium and tellurium as byproduct or unrecovered constituents.
Giant Cu-Zn(-Mo-Ag) skarn, zoned outward from porphyry centres (brown-garnet endoskarn through green-garnet skarn)
Antamina NI 43-101 (Section 7, p.7-1 to 7-23), p.7-1Open technical questions
Public resource reporting characterises grade and tonnage to a code standard. It is not designed to resolve element deportment by mineral phase. These are the questions this operation’s public reporting was not built to answer.
The resource statement reports contained Copper and zinc but no deportment for the molybdenum, silver, lead/bismuth carried in the concentrate; in which mineral phase that value resides is not resolved by the assays disclosed.
Grounded in: Molybdenum, silver, lead/bismuth is named as a byproduct or co-product commodity, with no separate grade in the located resource statement. source
Reported metallurgical recovery is 92% Cu, 79% Ag, 46% Mo; where the unrecovered fraction reports across concentrate, tailings and residue is not resolved by the disclosed assays.
Grounded in: The filing reports a metallurgical recovery of 92% Cu, 79% Ag, 46% Mo. source
The filing names As, Bi among the deleterious elements in the feed; the host phase of each in feed and residue is not resolved by the disclosed assays.
Grounded in: The filing names As, Bi as deleterious element(s). source
The deposit is described as Giant Cu-Zn(-Mo-Ag) skarn; public code-compliant reporting characterises grade and tonnage to a code standard but is not designed to resolve element deportment by mineral phase in this material.
Grounded in: The deposit type is reported as Giant Cu-Zn(-Mo-Ag) skarn, zoned outward from porphyry centres (brown-garnet endoskarn through green-garnet skarn). source
How those questions get answered
These are testable questions about element deportment by mineral phase, which code-compliant public reporting is not designed to resolve. A DETECT™ characterisation of a representative physical sample is the instrument built to answer them: it measures which phases host the value and how much is locked. It does not assume a result.
What was sought and not found
- 100%-basis production for FY2025 not captured (only Teck's 22.5% attributable share cited).
- No public element-deportment-by-mineral-phase data — this is exactly what DETECT would address, and its absence must be stated, not implied as hidden value.
- Cu-Zn resource sub-rows and full measured/indicated/inferred underground tables abbreviated in this sample; pull the complete Tables 1-1/1-2 for production use.
- Reserve/resource figures machine-extracted from the report summary, not hand-verified against the source page (verification_status = machine_extracted_unreviewed).
- Figures are machine-extracted from the cited filings and not yet independently verified by a qualified person (verification_status = machine_extracted_unreviewed). Confirm against the cited filing before external use.