Pinnacle Receives More Positive Results from Second Round of Scoping Metallurgical Tests at El Potrero with Average Gold Recovery of 97.8% for the Main Dos de Mayo Vein
Original announcement by tmx on
- Company
- Pinnacle Silver and Gold Corp.
- Ticker
- PINN
- Exchange
- TSX
- Region
- Durango, Mexico
- Primary commodity
- Gold
- Secondary commodities
- Silver
- Document categories
- Metallurgy
- Extracted
- 2026-09-12 18:38:07 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Pinnacle Silver and Gold Corp. reported successful second-round scoping metallurgical tests at the El Potrero project in Mexico. Results showed exceptional gold recoveries averaging 97.8% for the Dos de Mayo vein via bottle roll leaching, while silver recoveries were more variable due to complex mineralogy.
Reasoning: Second round of scoping tests confirms very high gold recoveries (97.8%) and robust head grades, though silver mineralogy is more complex.
Positive factors
- High gold recoveries (>97%)
- Free-milling characteristics (electrum)
- Low deleterious elements
- Small grain size suggests predictable grind requirements
Negative factors
- Silver recovery is variable and lower than gold
- Gravity circuit showed no benefit and actually penalized silver recovery
Facts used in scoring: 8
Classification and evidence
Free Millingpositive
Simple, clean ore amenable to standard processing without oxidation.
Why it applies: Gold detected as electrum and high recoveries suggest simple metallurgy.
Evidence · text
“Gold in the form of electrum, a natural Au-Ag alloy, was detected in all seven samples.”
Bench Scale Onlynegative
Only preliminary bench tests completed — no locked-cycle or pilot work.
Why it applies: Tests were bottle roll and gravity tests on 1kg/25kg samples, which are bench-scale.
Evidence · text
“The bottle roll test was performed in a 2-gallon Nalgene bottle, using 1,000 g of sample”
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: the document describes a mill_cil route ("concentrator")
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: the document describes a gravity route ("gravity")
Multi-Domain Testedpositive
Variability across ore domains (oxide, transition, fresh) has been addressed.
Why it applies: 3 distinct composites were tested
Extracted facts
Stored fact records: 8. Some facts used in scoring do not have a stored record.
Metallurgical Results (8)
bottle rollEl Potrero · goldRecovery: 97.83 %View all detailsHide details
Identity
- Project
- El Potrero
- Commodity
- gold
- Region
- mexico
- Reported Region
- Durango, Mexico
- Ticker
- PINN
Test Work
- Program Status
- preliminary
- Test Type
- bottle roll
- Processing Route
- bottle roll cyanide leach
- Sample
- Dos de Mayo vein composite (5 samples), 53 micron grind
- Grind P80
- 53 µm
Recovery
- Recovery
- 97.83 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- SGS
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-06-02T00:00:00.000Z
Reasoning: 97.83% recovery is exceptional for a preliminary scoping test.
Positive factors
- Exceptional gold recovery
Evidence · text
“the five-sample composite from the bottle roll cyanide leach tests... resulted in a gold recovery of 97.83%”
Tags used in scoring
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: 97.83% is at or above the exceptional band (95%)
bottle rollEl Potrero · silverRecovery: 70.02 %View all detailsHide details
Identity
- Project
- El Potrero
- Commodity
- silver
- Region
- mexico
- Reported Region
- Durango, Mexico
- Ticker
- PINN
Test Work
- Program Status
- preliminary
- Test Type
- bottle roll
- Processing Route
- bottle roll cyanide leach
- Sample
- Dos de Mayo vein composite (5 samples), 53 micron grind
- Grind P80
- 53 µm
Recovery
- Recovery
- 70.02 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- SGS
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-06-02T00:00:00.000Z
Reasoning: Silver recovery is moderate and shows complexity compared to gold.
Positive factors
- Improved recoveries compared to previous rounds
Negative factors
- Variable and lower than gold
Evidence · text
“a silver recovery of 70.02%”
Tags used in scoring
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 70.02% is below the weak band (75%)
bottle rollEl Potrero · goldRecovery: 96.79 %View all detailsHide details
Identity
- Project
- El Potrero
- Commodity
- gold
- Region
- mexico
- Reported Region
- Durango, Mexico
- Ticker
- PINN
Test Work
- Program Status
- preliminary
- Test Type
- bottle roll
- Processing Route
- bottle roll cyanide leach
- Sample
- Dos de Mayo vein composite (5 samples), 75 micron grind
- Grind P80
- 75 µm
Recovery
- Recovery
- 96.79 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- SGS
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-06-02T00:00:00.000Z
Reasoning: High recovery even at a coarser grind.
Positive factors
- High gold recovery
Evidence · text
“resulted in gold and silver recoveries of 96.79% and 66.38%, respectively”
Tags used in scoring
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: 96.79% is at or above the exceptional band (95%)
bottle rollEl Potrero · silverRecovery: 66.38 %View all detailsHide details
Identity
- Project
- El Potrero
- Commodity
- silver
- Region
- mexico
- Reported Region
- Durango, Mexico
- Ticker
- PINN
Test Work
- Program Status
- preliminary
- Test Type
- bottle roll
- Processing Route
- bottle roll cyanide leach
- Sample
- Dos de Mayo vein composite (5 samples), 75 micron grind
- Grind P80
- 75 µm
Recovery
- Recovery
- 66.38 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- SGS
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-06-02T00:00:00.000Z
Reasoning: Silver recovery is lower at 75 microns compared to 53 microns.
Negative factors
- Lower recovery at coarser grind
Evidence · text
“resulted in gold and silver recoveries of 96.79% and 66.38%, respectively”
Tags used in scoring
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 66.38% is below the weak band (75%)
bottle rollEl Potrero · goldRecovery: 97.6 %View all detailsHide details
Identity
- Project
- El Potrero
- Commodity
- gold
- Region
- mexico
- Reported Region
- Durango, Mexico
- Ticker
- PINN
Test Work
- Program Status
- preliminary
- Test Type
- bottle roll
- Processing Route
- bottle roll cyanide leach
- Sample
- La Estrella vein sample
Recovery
- Recovery
- 97.6 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- SGS
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-06-02T00:00:00.000Z
Reasoning: Consistent high gold recovery across different veins.
Positive factors
- High gold recovery
Evidence · text
“gold recoveries of 97.6%... were obtained for the Estrella... veins”
Tags used in scoring
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: 97.6% is at or above the exceptional band (95%)
bottle rollEl Potrero · silverRecovery: 64.7 %View all detailsHide details
Identity
- Project
- El Potrero
- Commodity
- silver
- Region
- mexico
- Reported Region
- Durango, Mexico
- Ticker
- PINN
Test Work
- Program Status
- preliminary
- Test Type
- bottle roll
- Processing Route
- bottle roll cyanide leach
- Sample
- La Estrella vein sample
Recovery
- Recovery
- 64.7 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- SGS
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-06-02T00:00:00.000Z
Reasoning: Silver recovery is lower and more variable than gold.
Negative factors
- Variable silver recovery
Evidence · text
“silver recoveries were more variable, at... 64.7%... for La Estrella”
Tags used in scoring
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 64.7% is below the weak band (75%)
bottle rollEl Potrero · goldRecovery: 97.4 %View all detailsHide details
Identity
- Project
- El Potrero
- Commodity
- gold
- Region
- mexico
- Reported Region
- Durango, Mexico
- Ticker
- PINN
Test Work
- Program Status
- preliminary
- Test Type
- bottle roll
- Processing Route
- bottle roll cyanide leach
- Sample
- El Capulin vein sample
Recovery
- Recovery
- 97.4 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- SGS
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-06-02T00:00:00.000Z
Reasoning: Consistent high gold recovery.
Positive factors
- High gold recovery
Evidence · text
“gold recoveries of... 97.4% were obtained for the... Capulin... veins”
Tags used in scoring
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: 97.4% is at or above the exceptional band (95%)
bottle rollEl Potrero · silverRecovery: 80.5 %View all detailsHide details
Identity
- Project
- El Potrero
- Commodity
- silver
- Region
- mexico
- Reported Region
- Durango, Mexico
- Ticker
- PINN
Test Work
- Program Status
- preliminary
- Test Type
- bottle roll
- Processing Route
- bottle roll cyanide leach
- Sample
- El Capulin vein sample
Recovery
- Recovery
- 80.5 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- SGS
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-06-02T00:00:00.000Z
Reasoning: Silver recovery in El Capulin is better than in the other tested veins.
Positive factors
- Relatively high silver recovery compared to other veins
Evidence · text
“silver recoveries... at... 80.5%, respectively, reflecting the more complex silver mineralogy”
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.