Cosigo Resources Announces Results of Conglomerate Layer Bulk Sample for Gravity Concentration Tests
Original announcement by tmx on
- Company
- Cosigo Resources Ltd.
- Ticker
- CSG
- Exchange
- TSX
- Region
- Colombia
- Primary commodity
- Gold
- Secondary commodities
- None reported
- Document categories
- Metallurgy
- Extracted
- 2026-09-15 19:02:19 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Cosigo Resources has released metallurgical results from Knelson gravity concentration tests on a 60kg bulk sample from the Chicken Coop Conglomerate at the Taraira project. The tests revealed a very low weighted average gold grade of 0.03 g/t Au, though gravity separation was able to concentrate gold into the pan tails.
Reasoning: The bulk sample testing shows extremely low gold grades (0.03 g/t Au), which significantly limits the economic potential of the conglomerate layer despite successful gravity separation into tails.
Positive factors
- Gravity concentration demonstrated ability to concentrate gold into pan tails
- Knelson testing conducted on bulk sample
Negative factors
- Very low head grade (0.03 g/t Au) makes economic viability questionable
- Low recovery efficiency in the pan concentrate
Facts used in scoring: 3
Classification and evidence
Bench Scale Onlynegative
Only preliminary bench tests completed — no locked-cycle or pilot work.
Why it applies: Testing was conducted on a 60kg composite sample using Knelson gravity testing.
Evidence · text
“Knelson gravity testing was conducted on a composite 60kg sample”
QP/CP Signedpositive · Story-specific tag
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: Erik Ostensoe, P.Geo., a Qualified Person, has reviewed and approved the disclosure.
Evidence · text
“Erik Ostensoe, P.Geo., ... a Qualified Person ... has reviewed and approves the scientific and technical disclosure”
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: the document describes a flotation route ("concentrate")
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: the document describes a gravity route ("gravity")
Single Domain Onlynegative
Testing limited to one composite or domain — representativeness not established.
Why it applies: only one composite was tested
Extracted facts
Stored fact records: 3. Some facts used in scoring do not have a stored record.
Metallurgical Results (3)
gravityTaraira · goldRecovery: 6.9 %Head Grade: 0.03Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Taraira
- Commodity
- gold
- Region
- colombia
- Reported Region
- Colombia
- Ticker
- CSG
Test Work
- Program Status
- preliminary
- Test Type
- gravity
- Processing Route
- Knelson gravity testing
- Sample
- 20kg Knelson gravity test (Pan Concentrate)
Recovery
- Recovery
- 6.9 %
- Head Grade
- 0.03
- Head Grade Unit
- g/t
- Conc. Grade
- 5.21
- Conc. Grade Unit
- g/t
- Tailings Grade
- 10.2
- Tailings Grade Unit
- g/t
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-04-07T00:00:00.000Z
Reasoning: Pan concentrate grade is low relative to the tails.
Evidence · text
“Pan Concentrate weighing 11.2g... assayed 5.21g/t Au, containing 6.9% of the Au in the sample.”
Tags used in scoring
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: processing_route matches the gravity signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 6.9% is below the weak band (80%)
gravityTaraira · goldRecovery: 58 %Head Grade: 0.03Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Taraira
- Commodity
- gold
- Region
- colombia
- Reported Region
- Colombia
- Ticker
- CSG
Test Work
- Program Status
- preliminary
- Test Type
- gravity
- Processing Route
- Knelson gravity testing
- Sample
- 20kg Knelson gravity test (Pan Tails)
Recovery
- Recovery
- 58 %
- Head Grade
- 0.03
- Head Grade Unit
- g/t
- Conc. Grade
- 10.2
- Conc. Grade Unit
- g/t
- Tailings Grade
- 0.02
- Tailings Grade Unit
- g/t
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-04-07T00:00:00.000Z
Reasoning: The majority of the gold (58%) was recovered in the pan tails.
Positive factors
- High recovery into the pan tails
Evidence · text
“Pan Tails were 48.1g... assayed 10.2g/t Au, containing 58.0% of the Au in the sample.”
Tags used in scoring
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: processing_route matches the gravity signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 58% is below the weak band (80%)
gravityTaraira · goldRecovery: 35.2 %Head Grade: 0.03Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Taraira
- Commodity
- gold
- Region
- colombia
- Reported Region
- Colombia
- Ticker
- CSG
Test Work
- Program Status
- preliminary
- Test Type
- gravity
- Processing Route
- Knelson gravity testing
- Sample
- 20kg Knelson gravity test (Knelson Tails)
Recovery
- Recovery
- 35.2 %
- Head Grade
- 0.03
- Head Grade Unit
- g/t
- Conc. Grade
- 0.02
- Conc. Grade Unit
- g/t
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-04-07T00:00:00.000Z
Reasoning: 35.2% of the gold remains in the Knelson tails.
Negative factors
- Significant gold loss to tails
Evidence · text
“Knelson Tails were 19.9993kg... assayed 0.02g/t Au representing 35.2% of the Au in the sample.”
Tags used in scoring
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: processing_route matches the gravity signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 35.2% 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.