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
- 2026-08-20 22:10:34 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 using bottle roll leach, with head grades averaging 7.7 g/t Au and 116 g/t Ag.
Reasoning: Second round of scoping metallurgical tests shows very high gold recoveries (>97%) and robust head grades, though silver recovery is more complex and variable.
Positive factors
- exceptional gold recoveries
- robust head grades
- low deleterious elements
- QP/CP signed
Negative factors
- variable silver recovery
- gravity circuit not beneficial
Facts used in scoring: 6
Classification and evidence
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: Gold recoveries are consistently above 97% for all veins tested.
Evidence · text
“averaging 97.8% [gold recovery]”
QA/QC Disclosedpositive · Story-specific tag
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: Release mentions SGS lab, duplicate assays, and QP/CP sign-off.
Evidence · text
“Seven mineralized samples were sent to the SGS Lab”
Free Millingpositive
Simple, clean ore amenable to standard processing without oxidation.
Why it applies: Gold in the form of electrum was detected and shows excellent response to direct cyanidation.
Evidence · text
“This suggests that the ore exhibits an excellent response to cyanidation, particularly for gold.”
Extracted facts
Stored fact records: 6. Some facts used in scoring do not have a stored record.
Metallurgical Results (6)
bottle rollgoldRecovery: 97.83 %View all detailsHide details
Identity
- Commodity
- gold
- Ticker
- PINN
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- bottle roll cyanide leach
- Sample
- Dos de Mayo vein composite (5-sample composite), 53 micron grind
- Grind P80
- 53 µm
Recovery
- Recovery
- 97.83 %
- Recovery Basis
- actual_test
Reagents
- Cyanide
- 1.24 kg/t
- Lime
- 0.8 kg/t
Lab
- Laboratory
- SGS
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-06-02T00:00:00.000Z
Reasoning: 97.83% gold recovery at 53 microns is exceptional for a scoping-stage bottle roll 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%”
bottle rollsilverRecovery: 70.02 %View all detailsHide details
Identity
- Commodity
- silver
- Ticker
- PINN
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- bottle roll cyanide leach
- Sample
- Dos de Mayo vein composite (5-sample composite), 53 micron grind
- Grind P80
- 53 µm
Recovery
- Recovery
- 70.02 %
- Recovery Basis
- actual_test
Reagents
- Cyanide
- 1.24 kg/t
- Lime
- 0.8 kg/t
Lab
- Laboratory
- SGS
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-06-02T00:00:00.000Z
Reasoning: Silver recovery is moderate and noted as more variable due to complex mineralogy.
Positive factors
- improved silver recovery
Negative factors
- variable silver recovery
Evidence · text
“silver recovery of 70.02%”
bottle rollgoldRecovery: 97.6 %View all detailsHide details
Identity
- Commodity
- gold
- Ticker
- PINN
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- bottle roll cyanide leach
- Sample
- La Estrella vein composite, 75 micron grind
- Grind P80
- 75 µm
Recovery
- Recovery
- 97.6 %
- Recovery Basis
- actual_test
Reagents
- Cyanide
- 0.79 kg/t
- Lime
- 0.6 kg/t
Lab
- Laboratory
- SGS
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-06-02T00:00:00.000Z
Reasoning: 97.6% gold recovery is very strong.
Positive factors
- high gold recovery
Evidence · text
“gold recoveries of 97.6%... for the Estrella... veins”
bottle rollsilverRecovery: 64.7 %View all detailsHide details
Identity
- Commodity
- silver
- Ticker
- PINN
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- bottle roll cyanide leach
- Sample
- La Estrella vein composite, 75 micron grind
- Grind P80
- 75 µm
Recovery
- Recovery
- 64.7 %
- Recovery Basis
- actual_test
Reagents
- Cyanide
- 0.79 kg/t
- Lime
- 0.6 kg/t
Lab
- Laboratory
- SGS
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-06-02T00:00:00.000Z
Reasoning: 64.7% silver recovery is moderate and reflects complex mineralogy.
Negative factors
- moderate silver recovery
Evidence · text
“silver recoveries were more variable, at... 64.7% for La Estrella”
bottle rollgoldRecovery: 97.4 %View all detailsHide details
Identity
- Commodity
- gold
- Ticker
- PINN
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- bottle roll cyanide leach
- Sample
- El Capulin vein composite, 75 micron grind
- Grind P80
- 75 µm
Recovery
- Recovery
- 97.4 %
- Recovery Basis
- actual_test
Reagents
- Cyanide
- 1.09 kg/t
- Lime
- 0.6 kg/t
Lab
- Laboratory
- SGS
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-06-02T00:00:00.000Z
Reasoning: 97.4% gold recovery is very strong.
Positive factors
- high gold recovery
Evidence · text
“gold recoveries of... 97.4% were obtained for the... Capulin veins”
bottle rollsilverRecovery: 80.5 %View all detailsHide details
Identity
- Commodity
- silver
- Ticker
- PINN
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- bottle roll cyanide leach
- Sample
- El Capulin vein composite, 75 micron grind
- Grind P80
- 75 µm
Recovery
- Recovery
- 80.5 %
- Recovery Basis
- actual_test
Reagents
- Cyanide
- 1.09 kg/t
- Lime
- 0.6 kg/t
Lab
- Laboratory
- SGS
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-06-02T00:00:00.000Z
Reasoning: 80.5% silver recovery is strong for this vein.
Positive factors
- strong silver recovery
Evidence · text
“silver recoveries... at... 80.5% [for El Capulin]”
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.