Lara Reports Results of Preliminary Economic Assessment for its Planalto Copper-Gold Project
Original announcement by tmx on
- Company
- Lara Exploration Ltd.
- Ticker
- LRA
- Exchange
- TSX
- Region
- Pará State, Brazil
- Primary commodity
- Copper
- Secondary commodities
- Gold
- Document categories
- Resource update, Metallurgy
- Extracted
- 2026-09-12 11:34:10 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Lara Exploration Ltd. announced positive results from a Preliminary Economic Assessment (PEA) for its 100% owned Planalto Copper-Gold Project in Brazil, highlighting an after-tax NPV of US$378 million (8% discount rate) and an IRR of 21% over an 18-year mine life. The study projects average annual production of 36 kt copper and 7.2 koz gold in the first six years, with life-of-mine totals of 560 kt copper and 111 koz gold, based on an open pit operation and conventional flotation processing achieving 90.9% copper and 51.1% gold recovery. Initial capital expenditures are estimated at US$546 million, with all-in sustaining costs of US$2.70/lb payable copper, though the PEA relies heavily on Inferred Mineral Resources (76%) and excludes oxide mineralization.
Reasoning: The PEA demonstrates strong economic viability for the Planalto Copper-Gold Project with robust NPV and IRR, supported by good copper recoveries and excellent infrastructure, despite a high proportion of inferred resources and the preliminary nature of the study.
Positive factors
- Strong PEA economics (NPV, IRR, payback)
- Good copper recovery (90.9%)
- Excellent infrastructure and positive permitting environment in Brazil
- Low carbon footprint due to renewable energy grid
- QP/CP signed and NI 43-101 compliant
Negative factors
- High proportion of Inferred Resources (76%) in the PEA
- PEA is preliminary in nature (scoping level)
- Oxide mineralization excluded from the PEA
- SUDAM tax benefits assumed but not yet confirmed
- Gold recovery is low (51.1%)
Low confidence — this extraction should be reviewed alongside the original source.
Facts used in scoring: 13
Classification and evidence
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: The document reports the results of a Preliminary Economic Assessment (PEA) for the project.
Evidence · text
“Lara Reports Results of Preliminary Economic Assessment for its Planalto Copper-Gold Project”
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: The PEA includes a significant proportion (76%) of Inferred Mineral Resources, which are considered speculative.
Evidence · text
“The PEA is preliminary in nature and includes Inferred Mineral Resources which make up approximately 76% of the total Mineral Resources.”
QP/CP Signedpositive
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: The PEA and MRE are signed off by multiple Qualified Persons (QPs) under NI 43-101.
Evidence · text
“The following persons are the Qualified Persons under NI 43-101 that are responsible for the PEA and have reviewed and approved the scientific and technical information contained in this news release: Martin Pittuck CEng, FGS, MIMMM(QMR), Leonardo de Freitas Leite, MSc, FAusIMM (CP), Liam MacNamara PhD, ACSM, MIMMM, Jamie Spiers, CEng MIMMM, David Carruth, CEng MICE IntPE, Colin Chapman, CEng MIMMM, Thiago Toussaint MSc, MBA, MAusIMM CP(Env).”
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: The PEA and underlying MRE are prepared in accordance with National Instrument 43-101.
Evidence · text
“Technical Report prepared in accordance with National Instrument 43-101 - Standards of Disclosure for Mineral Projects”
Open Pit Miningneutral · Story-specific tag
No canonical definition is currently available.
Why it applies: The PEA envisages a conventional open pit mine using a truck and shovel operation.
Evidence · text
“Planalto will be developed as a conventional open pit mine, with processing via a conventional crushing and grinding circuit followed by froth flotation.”
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: The processing flowsheet incorporates a conventional semi-autogenous grinding mill followed by 2 ball mills.
Evidence · text
“A traditional copper flotation process flow sheet has been adopted, incorporating a conventional semi-autogenous grinding mill followed by 2 ball mills”
Flotation Routeneutral · Story-specific tag
No canonical definition is currently available.
Why it applies: The processing method is froth flotation to produce a copper-gold concentrate.
Evidence · text
“conventional crushing and grinding circuit followed by froth flotation.”
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: The copper recovery of 90.9% is strong for a flotation process.
Evidence · text
“average metallurgical recoveries of 90.9% for copper”
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: The gold recovery of 51.1% is weak for a flotation process.
Evidence · text
“51.1% for gold”
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: The mineral resource estimate is reported above a disclosed cut-off grade of 0.16% CuEq.
Evidence · text
“reported above a cut-off grade of 0.16% CuEq”
Single Domain Onlynegative
Testing limited to one composite or domain — representativeness not established.
Why it applies: The MRE contains fresh rock domains only, with oxide mineralization excluded from the PEA.
Evidence · text
“The MRE contains fresh rock domains only, the oxide mineralization is not reported. Excluded from the PEA is processing of oxide mineralised material”
Extracted facts
Stored fact records: 13. Some facts used in scoring do not have a stored record.
Resource Estimates (11)
indicatedPlanalto Copper-Gold Project · copperTonnes: 47700000Grade: 0.53Grade Unit: %Contained Metal: 253Contained Unit: ktView all detailsHide details
Identity
- Project
- Planalto Copper-Gold Project
- Commodity
- copper
- Region
- brazil
- Reported Region
- Pará State, Brazil
- Ticker
- LRA
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, other
- QP Signed
- Yes
- Qualified person names
- Martin Pittuck, Leonardo de Freitas Leite, Liam MacNamara, Jamie Spiers, David Carruth, Colin Chapman, Thiago Toussaint
- Resource group id
- resource:3e928fed5aff78bc169d
- Deposit or zone
- Main Mineralization
Resource Data
- Category
- indicated
- Tonnes
- 47700000
- Grade
- 0.53
- Grade Unit
- %
- Contained Metal
- 253
- Contained Unit
- kt
- Cutoff Grade
- 0.16
- Cutoff Unit
- % CuEq
Prior Estimate
- Resource Date
- 2024-07-03
Metal Equivalent
- Metal Eq. Grade
- 0.56
- Metal Eq. Unit
- % CuEq
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2025-10-21T00:00:00.000Z
Reasoning: This indicated resource provides a solid base for the PEA, with a good copper grade for the deposit type.
Positive factors
- Good grade for a porphyry-style deposit
- Forms part of the economic PEA
Evidence · table
“0.53”
Context: 47.7
Tags used in scoring
Indicated Resourcepositive
Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves.
Why it applies: category is "indicated"
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: cutoff_grade is stated
QP/CP Signedpositive
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: qp_signed is true
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
indicatedPlanalto Copper-Gold Project · goldTonnes: 47700000Grade: 0.06Grade Unit: g/tContained Metal: 92Contained Unit: kozView all detailsHide details
Identity
- Project
- Planalto Copper-Gold Project
- Commodity
- gold
- Region
- brazil
- Reported Region
- Pará State, Brazil
- Ticker
- LRA
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, other
- QP Signed
- Yes
- Qualified person names
- Martin Pittuck, Leonardo de Freitas Leite, Liam MacNamara, Jamie Spiers, David Carruth, Colin Chapman, Thiago Toussaint
- Resource group id
- resource:3e928fed5aff78bc169d
- Deposit or zone
- Main Mineralization
Resource Data
- Category
- indicated
- Tonnes
- 47700000
- Grade
- 0.06
- Grade Unit
- g/t
- Contained Metal
- 92
- Contained Unit
- koz
- Cutoff Grade
- 0.16
- Cutoff Unit
- % CuEq
Prior Estimate
- Resource Date
- 2024-07-03
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2025-10-21T00:00:00.000Z
Reasoning: The gold grade is low but contributes as a valuable byproduct to the overall project economics.
Positive factors
- Provides gold credits to the project economics
Evidence · table
“0.06”
Context: 47.7
Tags used in scoring
Indicated Resourcepositive
Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves.
Why it applies: category is "indicated"
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: cutoff_grade is stated
QP/CP Signedpositive
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: qp_signed is true
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
indicatedPlanalto Copper-Gold Project · copperTonnes: 47700000View all detailsHide details
Identity
- Project
- Planalto Copper-Gold Project
- Commodity
- copper
- Region
- brazil
- Reported Region
- Pará State, Brazil
- Ticker
- LRA
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, other
- QP Signed
- Yes
- Qualified person names
- Martin Pittuck, Leonardo de Freitas Leite, Liam MacNamara, Jamie Spiers, David Carruth, Colin Chapman, Thiago Toussaint
- Resource group id
- resource:3e928fed5aff78bc169d
- Deposit or zone
- Main Mineralization
Resource Data
- Category
- indicated
- Tonnes
- 47700000
- Cutoff Grade
- 0.16
- Cutoff Unit
- % CuEq
Prior Estimate
- Resource Date
- 2024-07-03
Metal Equivalent
- Metal Eq. Grade
- 0.56
- Metal Eq. Unit
- % CuEq
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2025-10-21T00:00:00.000Z
Reasoning: The copper equivalent grade provides a comprehensive view of the resource's value, with transparent calculation assumptions.
Positive factors
- Provides a combined economic grade for the resource
- Assumptions for calculation are disclosed
Evidence · table
“0.56”
Context: 47.7
Tags used in scoring
Indicated Resourcepositive
Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves.
Why it applies: category is "indicated"
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: cutoff_grade is stated
QP/CP Signedpositive
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: qp_signed is true
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
No Contained Metalnegative
Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting.
Why it applies: contained_metal was not reported
inferredPlanalto Copper-Gold Project · copperTonnes: 77700000Grade: 0.51Grade Unit: %Contained Metal: 396Contained Unit: ktView all detailsHide details
Identity
- Project
- Planalto Copper-Gold Project
- Commodity
- copper
- Region
- brazil
- Reported Region
- Pará State, Brazil
- Ticker
- LRA
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, other
- QP Signed
- Yes
- Qualified person names
- Martin Pittuck, Leonardo de Freitas Leite, Liam MacNamara, Jamie Spiers, David Carruth, Colin Chapman, Thiago Toussaint
- Resource group id
- resource:1570ef4554ae736e8d5d
- Deposit or zone
- Main Mineralization
Resource Data
- Category
- inferred
- Tonnes
- 77700000
- Grade
- 0.51
- Grade Unit
- %
- Contained Metal
- 396
- Contained Unit
- kt
- Cutoff Grade
- 0.16
- Cutoff Unit
- % CuEq
Prior Estimate
- Resource Date
- 2024-07-03
Metal Equivalent
- Metal Eq. Grade
- 0.54
- Metal Eq. Unit
- % CuEq
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2025-10-21T00:00:00.000Z
Reasoning: This inferred resource adds substantial copper tonnage, but its speculative nature means higher risk.
Positive factors
- Adds significant tonnage to the resource base
- Good grade for inferred category
Negative factors
- Inferred category carries higher geological risk
Evidence · table
“0.51”
Context: 77.7
Tags used in scoring
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: category is "inferred"
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: cutoff_grade is stated
QP/CP Signedpositive
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: qp_signed is true
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
inferredPlanalto Copper-Gold Project · goldTonnes: 77700000Grade: 0.06Grade Unit: g/tContained Metal: 149.9Contained Unit: kozView all detailsHide details
Identity
- Project
- Planalto Copper-Gold Project
- Commodity
- gold
- Region
- brazil
- Reported Region
- Pará State, Brazil
- Ticker
- LRA
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, other
- QP Signed
- Yes
- Qualified person names
- Martin Pittuck, Leonardo de Freitas Leite, Liam MacNamara, Jamie Spiers, David Carruth, Colin Chapman, Thiago Toussaint
- Resource group id
- resource:1570ef4554ae736e8d5d
- Deposit or zone
- Main Mineralization
Resource Data
- Category
- inferred
- Tonnes
- 77700000
- Grade
- 0.06
- Grade Unit
- g/t
- Contained Metal
- 149.9
- Contained Unit
- koz
- Cutoff Grade
- 0.16
- Cutoff Unit
- % CuEq
Prior Estimate
- Resource Date
- 2024-07-03
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2025-10-21T00:00:00.000Z
Reasoning: The gold content in this inferred resource provides additional value, but its classification adds uncertainty.
Positive factors
- Contributes to gold credits
Negative factors
- Inferred category carries higher geological risk
Evidence · table
“0.06”
Context: 77.7
Tags used in scoring
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: category is "inferred"
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: cutoff_grade is stated
QP/CP Signedpositive
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: qp_signed is true
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
inferredPlanalto Copper-Gold Project · copperTonnes: 77700000View all detailsHide details
Identity
- Project
- Planalto Copper-Gold Project
- Commodity
- copper
- Region
- brazil
- Reported Region
- Pará State, Brazil
- Ticker
- LRA
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, other
- QP Signed
- Yes
- Qualified person names
- Martin Pittuck, Leonardo de Freitas Leite, Liam MacNamara, Jamie Spiers, David Carruth, Colin Chapman, Thiago Toussaint
- Resource group id
- resource:1570ef4554ae736e8d5d
- Deposit or zone
- Main Mineralization
Resource Data
- Category
- inferred
- Tonnes
- 77700000
- Cutoff Grade
- 0.16
- Cutoff Unit
- % CuEq
Prior Estimate
- Resource Date
- 2024-07-03
Metal Equivalent
- Metal Eq. Grade
- 0.54
- Metal Eq. Unit
- % CuEq
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2025-10-21T00:00:00.000Z
Reasoning: The copper equivalent grade for this inferred resource is good, but its classification means it's less certain.
Positive factors
- Provides a combined economic grade for the resource
- Assumptions for calculation are disclosed
Negative factors
- Inferred category carries higher geological risk
Evidence · table
“0.54”
Context: 77.7
Tags used in scoring
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: category is "inferred"
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: cutoff_grade is stated
QP/CP Signedpositive
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: qp_signed is true
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
No Contained Metalnegative
Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting.
Why it applies: contained_metal was not reported
inferredPlanalto Copper-Gold Project · copperTonnes: 76300000Grade: 0.2Grade Unit: %Contained Metal: 153Contained Unit: ktView all detailsHide details
Identity
- Project
- Planalto Copper-Gold Project
- Commodity
- copper
- Region
- brazil
- Reported Region
- Pará State, Brazil
- Ticker
- LRA
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, other
- QP Signed
- Yes
- Qualified person names
- Martin Pittuck, Leonardo de Freitas Leite, Liam MacNamara, Jamie Spiers, David Carruth, Colin Chapman, Thiago Toussaint
- Resource group id
- resource:9b670203f41a8dfef6c0
- Deposit or zone
- Host Rock Mineralization
Resource Data
- Category
- inferred
- Tonnes
- 76300000
- Grade
- 0.2
- Grade Unit
- %
- Contained Metal
- 153
- Contained Unit
- kt
- Cutoff Grade
- 0.16
- Cutoff Unit
- % CuEq
Prior Estimate
- Resource Date
- 2024-07-03
Metal Equivalent
- Metal Eq. Grade
- 0.22
- Metal Eq. Unit
- % CuEq
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2025-10-21T00:00:00.000Z
Reasoning: This lower-grade inferred resource from host rock mineralization contributes to overall tonnage but at a lower quality and higher risk.
Positive factors
- Adds to the overall resource base
Negative factors
- Lower grade compared to main mineralization
- Inferred category carries higher geological risk
Evidence · table
“0.2”
Context: 76.3
Tags used in scoring
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: category is "inferred"
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: cutoff_grade is stated
QP/CP Signedpositive
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: qp_signed is true
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
inferredPlanalto Copper-Gold Project · goldTonnes: 76300000Grade: 0.03Grade Unit: g/tContained Metal: 73.6Contained Unit: kozView all detailsHide details
Identity
- Project
- Planalto Copper-Gold Project
- Commodity
- gold
- Region
- brazil
- Reported Region
- Pará State, Brazil
- Ticker
- LRA
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, other
- QP Signed
- Yes
- Qualified person names
- Martin Pittuck, Leonardo de Freitas Leite, Liam MacNamara, Jamie Spiers, David Carruth, Colin Chapman, Thiago Toussaint
- Resource group id
- resource:9b670203f41a8dfef6c0
- Deposit or zone
- Host Rock Mineralization
Resource Data
- Category
- inferred
- Tonnes
- 76300000
- Grade
- 0.03
- Grade Unit
- g/t
- Contained Metal
- 73.6
- Contained Unit
- koz
- Cutoff Grade
- 0.16
- Cutoff Unit
- % CuEq
Prior Estimate
- Resource Date
- 2024-07-03
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2025-10-21T00:00:00.000Z
Reasoning: The gold content in this lower-grade inferred resource is minimal and adds little to the project's value.
Positive factors
- Provides some gold credits
Negative factors
- Very low grade
- Inferred category carries higher geological risk
Evidence · table
“0.03”
Context: 76.3
Tags used in scoring
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: category is "inferred"
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: cutoff_grade is stated
QP/CP Signedpositive
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: qp_signed is true
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
inferredPlanalto Copper-Gold Project · copperTonnes: 76300000View all detailsHide details
Identity
- Project
- Planalto Copper-Gold Project
- Commodity
- copper
- Region
- brazil
- Reported Region
- Pará State, Brazil
- Ticker
- LRA
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, other
- QP Signed
- Yes
- Qualified person names
- Martin Pittuck, Leonardo de Freitas Leite, Liam MacNamara, Jamie Spiers, David Carruth, Colin Chapman, Thiago Toussaint
- Resource group id
- resource:9b670203f41a8dfef6c0
- Deposit or zone
- Host Rock Mineralization
Resource Data
- Category
- inferred
- Tonnes
- 76300000
- Cutoff Grade
- 0.16
- Cutoff Unit
- % CuEq
Prior Estimate
- Resource Date
- 2024-07-03
Metal Equivalent
- Metal Eq. Grade
- 0.22
- Metal Eq. Unit
- % CuEq
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2025-10-21T00:00:00.000Z
Reasoning: The copper equivalent grade for this lower-grade inferred resource is marginal, reflecting its lower quality and higher risk.
Positive factors
- Adds to the overall resource base
- Assumptions for calculation are disclosed
Negative factors
- Lower grade compared to main mineralization
- Inferred category carries higher geological risk
Evidence · table
“0.22”
Context: 76.3
Tags used in scoring
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: category is "inferred"
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: cutoff_grade is stated
QP/CP Signedpositive
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: qp_signed is true
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
No Contained Metalnegative
Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting.
Why it applies: contained_metal was not reported
Fact 10StateView all detailsHide details
Identity
- Project
- State
- Region
- brazil
- Reported Region
- Brazil
- Ticker
- LRA
Resource scope
- Estimate type
- resource
- Resource group id
- resource:1eca36e03d12075f006c
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2025-10-21T00:00:00.000Z
Reasoning: Explicit resource disclosure recovered from source prose.
Evidence · text
“Whilst SRK considers this cut-off grade to be suitable for the PEA, the metal prices currently prevailing are higher which presents is an opportunity to use a lower cut-off grade when resource reporting and mine planning work evolve in the future.”
Tags used in scoring
Cut-off Lowerednegative
Cut-off grade reduced beyond the suspicious bound vs prior estimate — tonnage growth may be artificial inflation.
Why it applies: Whilst SRK considers this cut-off grade to be suitable for the PEA, the metal prices currently prevailing are higher which presents is an opportunity to use a lower cut-off grade when resource reporting and mine planning work evolve in the future.
Evidence · text
“Whilst SRK considers this cut-off grade to be suitable for the PEA, the metal prices currently prevailing are higher which presents is an opportunity to use a lower cut-off grade when resource reporting and mine planning work evolve in the future.”
Context: State, Brazil
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
No Contained Metalnegative
Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting.
Why it applies: contained_metal was not reported
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
inferredBrazilView all detailsHide details
Identity
- Project
- Brazil
- Region
- peru
- Reported Region
- Peru
- Ticker
- LRA
Resource scope
- Estimate type
- reserve
- Resource group id
- resource:d7132605c79db1b524fb
Resource Data
- Category
- inferred
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2025-10-21T00:00:00.000Z
Reasoning: Explicit resource disclosure recovered from source prose.
Evidence · text
“This news release contains forward-looking information regarding future or estimated financial and operational performance under the PEA including: estimated initial capital, sustaining capital, operating, sustaining and other costs, closure costs, net present value, internal rate of return and payback; metals price assumptions; estimated gold and copper production; estimated processing rates, throughput, ore grades and recovery rates; estimated LoM; the potential for future MRE growth from drilling; the development of Planalto as a conventional open pit mine; the potential to process the oxide mineralized material and the economics thereof; whether or not current or future discoveries of copper-gold mineralization at Planalto will have sufficient economic merit to consider development; potential repeatability and improvements to the economic assumptions and/or to metallurgical recoveries used in the PEA and MRE in future studies; the potential to convert some or all of the MRE to mineral reserves through economic studies and the timing and results of any such studies; opportunities to use a lower cut-off grade in the future; the carbon intensity of any future operation; the results of subsequent stages of permitting, including but not limited to the timing, granting and conditions of the LP, LI and LO referred to herein; the outcomes of future economic studies and the Company's plans in respect thereof; the potential for tax exemptions under SUDAM; project opportunities including the reduction of required footprint areas for TSF development, oxide exploration and the processing of oxide mineralized material, further improvements to metallurgical recoveries and optimization of processing reagent consumption, and MRE growth potential and the potential to convert existing inferred resources to the indicated category.”
Tags used in scoring
Cut-off Lowerednegative
Cut-off grade reduced beyond the suspicious bound vs prior estimate — tonnage growth may be artificial inflation.
Why it applies: This news release contains forward-looking information regarding future or estimated financial and operational performance under the PEA including: estimated initial capital, sustaining capital, operating, sustaining and other costs, closure costs, net present value, internal rate of return and payback; metals price assumptions; estimated gold and copper production; estimated processing rates, throughput, ore grades and recovery rates; estimated LoM; the potential for future MRE growth from drilling; the development of Planalto as a conventional open pit mine; the potential to process the oxide mineralized material and the economics thereof; whether or not current or future discoveries of copper-gold mineralization at Planalto will have sufficient economic merit to consider development; potential repeatability and improvements to the economic assumptions and/or to metallurgical recoveries used in the PEA and MRE in future studies; the potential to convert some or all of the MRE to mineral reserves through economic studies and the timing and results of any such studies; opportunities to use a lower cut-off grade in the future; the carbon intensity of any future operation; the results of subsequent stages of permitting, including but not limited to the timing, granting and conditions of the LP, LI and LO referred to herein; the outcomes of future economic studies and the Company's plans in respect thereof; the potential for tax exemptions under SUDAM; project opportunities including the reduction of required footprint areas for TSF development, oxide exploration and the processing of oxide mineralized material, further improvements to metallurgical recoveries and optimization of processing reagent consumption, and MRE growth potential and the potential to convert existing inferred resources to the indicated category.
Evidence · text
“This news release contains forward-looking information regarding future or estimated financial and operational performance under the PEA including: estimated initial capital, sustaining capital, operating, sustaining and other costs, closure costs, net present value, internal rate of return and payback; metals price assumptions; estimated gold and copper production; estimated processing rates, throughput, ore grades and recovery rates; estimated LoM; the potential for future MRE growth from drilling; the development of Planalto as a conventional open pit mine; the potential to process the oxide mineralized material and the economics thereof; whether or not current or future discoveries of copper-gold mineralization at Planalto will have sufficient economic merit to consider development; potential repeatability and improvements to the economic assumptions and/or to metallurgical recoveries used in the PEA and MRE in future studies; the potential to convert some or all of the MRE to mineral reserves through economic studies and the timing and results of any such studies; opportunities to use a lower cut-off grade in the future; the carbon intensity of any future operation; the results of subsequent stages of permitting, including but not limited to the timing, granting and conditions of the LP, LI and LO referred to herein; the outcomes of future economic studies and the Company's plans in respect thereof; the potential for tax exemptions under SUDAM; project opportunities including the reduction of required footprint areas for TSF development, oxide exploration and the processing of oxide mineralized material, further improvements to metallurgical recoveries and optimization of processing reagent consumption, and MRE growth potential and the potential to convert existing inferred resources to the indicated category.”
Context: Brazil, Peru
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: category is "inferred"
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
No Contained Metalnegative
Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting.
Why it applies: contained_metal was not reported
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
Metallurgical Results (2)
flotationPlanalto Copper-Gold Project · copperRecovery: 90.9 %View all detailsHide details
Identity
- Project
- Planalto Copper-Gold Project
- Commodity
- copper
- Region
- brazil
- Reported Region
- Pará State, Brazil
- Ticker
- LRA
Test Work
- Program Status
- preliminary
- Test Type
- flotation
- Processing Route
- conventional crushing and grinding circuit followed by froth flotation
- Sample
- RoM mineralisation
- Grind P80
- 75 µm
Recovery
- Recovery
- 90.9 %
- Recovery Basis
- actual_test
- Conc. Grade
- 28
- Conc. Grade Unit
- %
Lab
- Laboratory
- Blue Coast Laboratories
- Consultant
- SRK Consulting (UK) Ltd and SRK Consultores do Brasil Ltda.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2025-10-21T00:00:00.000Z
Reasoning: The high copper recovery is a strong positive for the project's economic viability.
Positive factors
- High recovery for copper flotation
- Supports project economics
Evidence · text
“average metallurgical recoveries of 90.9% for copper”
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
flotationPlanalto Copper-Gold Project · goldRecovery: 51.1 %View all detailsHide details
Identity
- Project
- Planalto Copper-Gold Project
- Commodity
- gold
- Region
- brazil
- Reported Region
- Pará State, Brazil
- Ticker
- LRA
Test Work
- Program Status
- preliminary
- Test Type
- flotation
- Processing Route
- conventional crushing and grinding circuit followed by froth flotation
- Sample
- RoM mineralisation
- Grind P80
- 75 µm
Recovery
- Recovery
- 51.1 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- Blue Coast Laboratories
- Consultant
- SRK Consulting (UK) Ltd and SRK Consultores do Brasil Ltda.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2025-10-21T00:00:00.000Z
Reasoning: The low gold recovery is a negative factor, potentially limiting the value of gold as a byproduct.
Negative factors
- Low recovery for gold flotation
- May impact gold credits
Evidence · text
“51.1% for gold”
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 51.1% is below the weak band (80%)
How Atlas produces this analysis
Minestarters Atlas uses automated extraction to summarize mining announcements, identify reported measurements, and classify supporting evidence. Sentiment reflects the extracted narrative and classification rules; it is an interpretation, not a reported measurement. Evidence quotes and context are provided where available. Missing data, low-confidence results, and review flags indicate limitations. Check the original publisher announcement before relying on an interpretation.