Sierra Madre Gold and Silver Announces Guitarra Processing Plant Achieves Throughputs of up to 720 Tonnes per Day as Development at Nazareno and Guitarra Mines Accelerates
Original announcement by jmn on
- Company
- Sierra Madre Gold and Silver Ltd.
- Ticker
- SM
- Exchange
- TSXV
- Region
- Estado de Mexico, Mexico
- Primary commodity
- Silver
- Secondary commodities
- Gold
- Document categories
- Resource update, Production
- Extracted
- 2026-09-29 18:27:44 UTC
Analysis by Minestarters Atlas
Atlas analysis published:
Minestarters Atlas analysis
Summary
Sierra Madre Gold and Silver has increased daily throughput at the Guitarra processing plant to 720 tonnes per day, a 40% increase over previous capacity. The company is advancing Phase 2 expansions and accelerating underground development at the Nazareno and Guitarra mines.
Reasoning: The company is successfully scaling throughput at the Guitarra plant and accelerating mine development, though the resource figures provided are historical restatements from 2023.
Positive factors
- throughput increase of 40% to 720 tpd
- accelerated underground development
- new ball mill installation completed
- Phase 2 expansion targets 1200-1500 tpd ahead of schedule
Negative factors
- resource data is from a 2023 estimate (stale data context)
- production decisions not based on NI 43-101 compliant reserves
Facts used in scoring: 9
Classification and evidence
Infill Drillingneutral · Story-specific tag
Confirmatory drilling to raise resource confidence, not new discovery.
Why it applies: The company is advancing development and expansion at existing mines to provide feed to the expanded plant.
Evidence · text
“Development has been accelerated at all three of the mines within La Guitarra - Guitarra, Nazareno and Coloso - to provide feed to the expanded plant.”
Resource Updateneutral
Revised estimate for an existing resource — compare to prior to assess progress.
Why it applies: The document provides updated operational context alongside restatements of the 2023 Mineral Resource Estimate.
Evidence · text
“Based on the 2023 Mineral Resource Estimate, the Nazareno Measured resource stood at 309,877 tonnes”
Extracted facts
Stored fact records: 8. Some facts used in scoring do not have a stored record.
Resource Estimates (8)
measuredNazareno · silverTonnes: 309877Grade: 215Grade Unit: g/tHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Nazareno
- Commodity
- silver
- Region
- mexico
- Reported Region
- Estado de Mexico, Mexico
- Ticker
- SM
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- David Thomas, Cristian Garcia
- Resource group id
- resource:e4983d2bceae91f53fce
- Deposit or zone
- Nazareno
- Resource basis
- gross
Resource Data
- Category
- measured
- Tonnes
- 309877
- Grade
- 215
- Grade Unit
- g/t
Prior Estimate
- Resource Date
- 2023-10-24
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2023-10-24T00:00:00.000Z
Dates
- Event date
- 2026-09-28T00:00:00.000Z
Reasoning: Restatement of 2023 resource data.
Negative factors
- historical restatement
Evidence · text
“Nazareno Measured resource stood at 309,877 tonnes grading 215 g/t silver and 0.55 g/t gold”
Tags used in scoring
Measured Resourcepositive
Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves.
Why it applies: category is "measured"
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was 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
Stale Estimatenegative
Effective date is >2 years old — data currency concern, may not reflect current geological understanding.
Why it applies: effective date is 2.9 years before this release
measuredNazareno · goldTonnes: 309877Grade: 0.55Grade Unit: g/tHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Nazareno
- Commodity
- gold
- Region
- mexico
- Reported Region
- Estado de Mexico, Mexico
- Ticker
- SM
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- David Thomas, Cristian Garcia
- Resource group id
- resource:e4983d2bceae91f53fce
- Deposit or zone
- Nazareno
- Resource basis
- gross
Resource Data
- Category
- measured
- Tonnes
- 309877
- Grade
- 0.55
- Grade Unit
- g/t
Prior Estimate
- Resource Date
- 2023-10-24
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2023-10-24T00:00:00.000Z
Dates
- Event date
- 2026-09-28T00:00:00.000Z
Reasoning: Restatement of 2023 resource data.
Negative factors
- historical restatement
Evidence · text
“Nazareno Measured resource stood at 309,877 tonnes grading 215 g/t silver and 0.55 g/t gold”
Tags used in scoring
Measured Resourcepositive
Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves.
Why it applies: category is "measured"
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was 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
Stale Estimatenegative
Effective date is >2 years old — data currency concern, may not reflect current geological understanding.
Why it applies: effective date is 2.9 years before this release
inferredNazareno · silverTonnes: 753784Grade: 229.2Grade Unit: g/tHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Nazareno
- Commodity
- silver
- Region
- mexico
- Reported Region
- Estado de Mexico, Mexico
- Ticker
- SM
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- David Thomas, Cristian Garcia
- Resource group id
- resource:00bfa48235f747fa4c97
- Deposit or zone
- Nazareno
- Resource basis
- gross
Resource Data
- Category
- inferred
- Tonnes
- 753784
- Grade
- 229.2
- Grade Unit
- g/t
Prior Estimate
- Resource Date
- 2023-10-24
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2023-10-24T00:00:00.000Z
Dates
- Event date
- 2026-09-28T00:00:00.000Z
Reasoning: Restatement of 2023 resource data.
Negative factors
- historical restatement
- inferred category
Evidence · text
“Inferred resources are at 753,784 tonnes grading 229.2 g/t silver, 0.29 g/t gold”
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 Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was 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
Stale Estimatenegative
Effective date is >2 years old — data currency concern, may not reflect current geological understanding.
Why it applies: effective date is 2.9 years before this release
inferredNazareno · goldTonnes: 753784Grade: 0.29Grade Unit: g/tHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Nazareno
- Commodity
- gold
- Region
- mexico
- Reported Region
- Estado de Mexico, Mexico
- Ticker
- SM
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- David Thomas, Cristian Garcia
- Resource group id
- resource:00bfa48235f747fa4c97
- Deposit or zone
- Nazareno
- Resource basis
- gross
Resource Data
- Category
- inferred
- Tonnes
- 753784
- Grade
- 0.29
- Grade Unit
- g/t
Prior Estimate
- Resource Date
- 2023-10-24
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2023-10-24T00:00:00.000Z
Dates
- Event date
- 2026-09-28T00:00:00.000Z
Reasoning: Restatement of 2023 resource data.
Negative factors
- historical restatement
- inferred category
Evidence · text
“Inferred resources are at 753,784 tonnes grading 229.2 g/t silver, 0.29 g/t gold”
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 Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was 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
Stale Estimatenegative
Effective date is >2 years old — data currency concern, may not reflect current geological understanding.
Why it applies: effective date is 2.9 years before this release
measuredSanta Ana · silverTonnes: 761292Grade: 159Grade Unit: g/tHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Santa Ana
- Commodity
- silver
- Region
- mexico
- Reported Region
- Estado de Mexico, Mexico
- Ticker
- SM
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- David Thomas, Cristian Garcia
- Resource group id
- resource:6ae5b2b60a76ba95f405
- Deposit or zone
- Santa Ana
- Resource basis
- gross
Resource Data
- Category
- measured
- Tonnes
- 761292
- Grade
- 159
- Grade Unit
- g/t
Prior Estimate
- Resource Date
- 2023-10-24
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2023-10-24T00:00:00.000Z
Dates
- Event date
- 2026-09-28T00:00:00.000Z
Reasoning: Restatement of 2023 resource data.
Negative factors
- historical restatement
Evidence · text
“Santa Ana deposit stands at 761,292 tonnes in the Measured category, grading 159 g/t silver and 0.19 g/t gold”
Tags used in scoring
Measured Resourcepositive
Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves.
Why it applies: category is "measured"
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was 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
Stale Estimatenegative
Effective date is >2 years old — data currency concern, may not reflect current geological understanding.
Why it applies: effective date is 2.9 years before this release
measuredSanta Ana · goldTonnes: 761292Grade: 0.19Grade Unit: g/tHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Santa Ana
- Commodity
- gold
- Region
- mexico
- Reported Region
- Estado de Mexico, Mexico
- Ticker
- SM
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- David Thomas, Cristian Garcia
- Resource group id
- resource:6ae5b2b60a76ba95f405
- Deposit or zone
- Santa Ana
- Resource basis
- gross
Resource Data
- Category
- measured
- Tonnes
- 761292
- Grade
- 0.19
- Grade Unit
- g/t
Prior Estimate
- Resource Date
- 2023-10-24
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2023-10-24T00:00:00.000Z
Dates
- Event date
- 2026-09-28T00:00:00.000Z
Reasoning: Restatement of 2023 resource data.
Negative factors
- historical restatement
Evidence · text
“Santa Ana deposit stands at 761,292 tonnes in the Measured category, grading 159 g/t silver and 0.19 g/t gold”
Tags used in scoring
Measured Resourcepositive
Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves.
Why it applies: category is "measured"
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was 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
Stale Estimatenegative
Effective date is >2 years old — data currency concern, may not reflect current geological understanding.
Why it applies: effective date is 2.9 years before this release
inferredSanta Ana · silverTonnes: 544892Grade: 178Grade Unit: g/tHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Santa Ana
- Commodity
- silver
- Region
- mexico
- Reported Region
- Estado de Mexico, Mexico
- Ticker
- SM
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- David Thomas, Cristian Garcia
- Resource group id
- resource:382ec31eb75c0e567722
- Deposit or zone
- Santa Ana
- Resource basis
- gross
Resource Data
- Category
- inferred
- Tonnes
- 544892
- Grade
- 178
- Grade Unit
- g/t
Prior Estimate
- Resource Date
- 2023-10-24
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2023-10-24T00:00:00.000Z
Dates
- Event date
- 2026-09-28T00:00:00.000Z
Reasoning: Restatement of 2023 resource data.
Negative factors
- historical restatement
- inferred category
Evidence · text
“Inferred resource is 544,892 tonnes grading 178 g/t silver, 0.13 g/t gold”
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 Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was 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
Stale Estimatenegative
Effective date is >2 years old — data currency concern, may not reflect current geological understanding.
Why it applies: effective date is 2.9 years before this release
inferredSanta Ana · goldTonnes: 544892Grade: 0.13Grade Unit: g/tHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Santa Ana
- Commodity
- gold
- Region
- mexico
- Reported Region
- Estado de Mexico, Mexico
- Ticker
- SM
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- David Thomas, Cristian Garcia
- Resource group id
- resource:382ec31eb75c0e567722
- Deposit or zone
- Santa Ana
- Resource basis
- gross
Resource Data
- Category
- inferred
- Tonnes
- 544892
- Grade
- 0.13
- Grade Unit
- g/t
Prior Estimate
- Resource Date
- 2023-10-24
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2023-10-24T00:00:00.000Z
Dates
- Event date
- 2026-09-28T00:00:00.000Z
Reasoning: Restatement of 2023 resource data.
Negative factors
- historical restatement
- inferred category
Evidence · text
“Inferred resource is 544,892 tonnes grading 178 g/t silver, 0.13 g/t gold”
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 Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was 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
Stale Estimatenegative
Effective date is >2 years old — data currency concern, may not reflect current geological understanding.
Why it applies: effective date is 2.9 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.