Sierra Madre Secures Land Use Authorization and Expands Land Holdings at Tlacotal
Original announcement by tmx on
- Company
- Sierra Madre Gold and Silver Ltd.
- Ticker
- SM
- Exchange
- TSX
- Region
- Estado de Mexico, Mexico
- Primary commodity
- Silver
- Secondary commodities
- Gold
- Document categories
- Resource update, Permitting
- Extracted
- 2026-09-16 22:59:47 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Sierra Madre Gold and Silver Ltd. has secured a federal land use change authorization (CUS) for its Tlacotal property in Mexico, transitioning the land from agricultural/forestry to mining use. Additionally, the company has expanded its land holdings through new purchase agreements and an option to purchase lands for the Lopez Extension.
Reasoning: The announcement is primarily a permitting and land acquisition milestone which provides optionality for future development, supported by the restatement of a 2023 resource estimate.
Positive factors
- Land use authorization received for Tlacotal property
- Expansion of land holdings via purchase agreements
- Option to purchase private lands for Lopez Extension
- Existing resource estimate provided for context
Facts used in scoring: 4
Classification and evidence
Permitting Milestonepositive · Story-specific tag
No canonical definition is currently available.
Why it applies: Company received Cambia de Suelos (CUS) designation for land use change from agriculture to mining.
Evidence · text
“authorization has been received for a change of land use for the Tlacotal property”
Stale Estimatenegative
Effective date is >2 years old — data currency concern, may not reflect current geological understanding.
Why it applies: The resource estimate provided is from 2023, making it over 2 years old relative to the 2026 publication date.
Evidence · text
“The 2023 NI 43-101 resource estimation for the Santa Ana vein in the East District is shown in Table 1 below.”
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: The resource estimate contains a significant Inferred component.
Evidence · table
“544,892”
Context: 544,892
Extracted facts
Stored fact records: 4. Some facts used in scoring do not have a stored record.
Resource Estimates (4)
indicatedSanta Ana vein, East District, La Guitarra · silverTonnes: 761292Grade: 159.3Grade Unit: g/tContained Metal: 3899046Contained Unit: ozHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Santa Ana vein, East District, La Guitarra
- Commodity
- silver
- Region
- mexico
- Reported Region
- Estado de Mexico, Mexico
- Ticker
- SM
Resource scope
- Estimate type
- resource
- Effective date
- 2023-10-24T00:00:00.000Z
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- David Thomas, Cristian Garcia, Gregory Smith
- Resource group id
- resource:3874ff3c276995619c5c
- Deposit or zone
- Santa Ana vein
- Mining method
- underground
Resource Data
- Category
- indicated
- Tonnes
- 761292
- Grade
- 159.3
- Grade Unit
- g/t
- Contained Metal
- 3899046
- Contained Unit
- oz
- Cutoff Grade
- 135
- Cutoff Unit
- g/t AgEq
Prior Estimate
- Resource Date
- 2023-10-24
Metal Equivalent
- Metal Eq. Grade
- 173.8
- Metal Eq. Unit
- g/t AgEq
- Assumptions Disclosed
- Yes
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2023-10-24T00:00:00.000Z
Dates
- Event date
- 2026-01-27T00:00:00.000Z
Reasoning: Indicated resource component of a 2023 estimate being restated.
Evidence · table
“159.3”
Context: 761,292
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
DFS-Supportingneutral
Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence.
Why it applies: the release names the study this estimate supports
Stale Estimatenegative
Effective date is >2 years old — data currency concern, may not reflect current geological understanding.
Why it applies: effective date is 2.3 years before this release
indicatedSanta Ana vein, East District, La Guitarra · goldTonnes: 761292Grade: 0.19Grade Unit: g/tContained Metal: 4650Contained Unit: ozHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Santa Ana vein, East District, La Guitarra
- Commodity
- gold
- Region
- mexico
- Reported Region
- Estado de Mexico, Mexico
- Ticker
- SM
Resource scope
- Estimate type
- resource
- Effective date
- 2023-10-24T00:00:00.000Z
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- David Thomas, Cristian Garcia, Gregory Smith
- Resource group id
- resource:3874ff3c276995619c5c
- Deposit or zone
- Santa Ana vein
- Mining method
- underground
Resource Data
- Category
- indicated
- Tonnes
- 761292
- Grade
- 0.19
- Grade Unit
- g/t
- Contained Metal
- 4650
- Contained Unit
- oz
- Cutoff Grade
- 135
- Cutoff Unit
- g/t AgEq
Prior Estimate
- Resource Date
- 2023-10-24
Metal Equivalent
- Metal Eq. Grade
- 173.8
- Metal Eq. Unit
- g/t AgEq
- Assumptions Disclosed
- Yes
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2023-10-24T00:00:00.000Z
Dates
- Event date
- 2026-01-27T00:00:00.000Z
Reasoning: Gold grade component of a 2023 estimate being restated.
Evidence · table
“0.19”
Context: 761,292
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
DFS-Supportingneutral
Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence.
Why it applies: the release names the study this estimate supports
Stale Estimatenegative
Effective date is >2 years old — data currency concern, may not reflect current geological understanding.
Why it applies: effective date is 2.3 years before this release
inferredSanta Ana vein, East District, La Guitarra · silverTonnes: 544892Grade: 178.1Grade Unit: g/tContained Metal: 3120080Contained Unit: ozHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Santa Ana vein, East District, La Guitarra
- Commodity
- silver
- Region
- mexico
- Reported Region
- Estado de Mexico, Mexico
- Ticker
- SM
Resource scope
- Estimate type
- resource
- Effective date
- 2023-10-24T00:00:00.000Z
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- David Thomas, Cristian Garcia, Gregory Smith
- Resource group id
- resource:4db781b248699bf14dc7
- Deposit or zone
- Santa Ana vein
- Mining method
- underground
Resource Data
- Category
- inferred
- Tonnes
- 544892
- Grade
- 178.1
- Grade Unit
- g/t
- Contained Metal
- 3120080
- Contained Unit
- oz
- Cutoff Grade
- 135
- Cutoff Unit
- g/t AgEq
Prior Estimate
- Resource Date
- 2023-10-24
Metal Equivalent
- Metal Eq. Grade
- 188.4
- Metal Eq. Unit
- g/t AgEq
- Assumptions Disclosed
- Yes
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2023-10-24T00:00:00.000Z
Dates
- Event date
- 2026-01-27T00:00:00.000Z
Reasoning: Inferred resource component of a 2023 estimate being restated.
Evidence · table
“178.1”
Context: 544,892
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
DFS-Supportingneutral
Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence.
Why it applies: the release names the study this estimate supports
Stale Estimatenegative
Effective date is >2 years old — data currency concern, may not reflect current geological understanding.
Why it applies: effective date is 2.3 years before this release
inferredSanta Ana vein, East District, La Guitarra · goldTonnes: 544892Grade: 0.13Grade Unit: g/tContained Metal: 2328Contained Unit: ozHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Santa Ana vein, East District, La Guitarra
- Commodity
- gold
- Region
- mexico
- Reported Region
- Estado de Mexico, Mexico
- Ticker
- SM
Resource scope
- Estimate type
- resource
- Effective date
- 2023-10-24T00:00:00.000Z
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- David Thomas, Cristian Garcia, Gregory Smith
- Resource group id
- resource:4db781b248699bf14dc7
- Deposit or zone
- Santa Ana vein
- Mining method
- underground
Resource Data
- Category
- inferred
- Tonnes
- 544892
- Grade
- 0.13
- Grade Unit
- g/t
- Contained Metal
- 2328
- Contained Unit
- oz
- Cutoff Grade
- 135
- Cutoff Unit
- g/t AgEq
Prior Estimate
- Resource Date
- 2023-10-24
Metal Equivalent
- Metal Eq. Grade
- 188.4
- Metal Eq. Unit
- g/t AgEq
- Assumptions Disclosed
- Yes
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2023-10-24T00:00:00.000Z
Dates
- Event date
- 2026-01-27T00:00:00.000Z
Reasoning: Gold grade component of a 2023 estimate being restated.
Evidence · table
“0.13”
Context: 544,892
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
DFS-Supportingneutral
Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence.
Why it applies: the release names the study this estimate supports
Stale Estimatenegative
Effective date is >2 years old — data currency concern, may not reflect current geological understanding.
Why it applies: effective date is 2.3 years before this release
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.