Inventus Reports Up to 75% Gold Recovery from Heap Leach Testwork at Pardo
Original announcement by globenewswire on
- Company
- Inventus Mining Corp
- Ticker
- IVS
- Exchange
- Unavailable
- Region
- Ontario
- Primary commodity
- Gold
- Secondary commodities
- None reported
- Document categories
- Metallurgy
- Extracted
- 2026-08-20 18:45:42 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Inventus Mining Corp reported gold recovery results from heap leach column testing at the Pardo Project in Ontario, with recoveries reaching 74.5% after 78 days for the -1/4 inch crush size. The results support a conceptual processing strategy involving ore sorting to separate high-grade material for milling from lower-grade material for heap leaching.
Reasoning: Positive heap leach testwork showing up to 75% recovery, though the company notes this specific high-grade composite might not be the optimal route for all material, suggesting an integrated ore-sorting/mill/heap-leach strategy.
Positive factors
- favourable reagent profile
- front-loaded recovery
Negative factors
- higher-grade composite may not be ideal for heap leach
Facts used in scoring: 9
Classification and evidence
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: The testwork specifically evaluated column leach recoveries for a potential heap leach processing strategy.
Evidence · text
“positive metallurgical heap leach test results”
Bench Scale Onlynegative
Only preliminary bench tests completed — no locked-cycle or pilot work.
Why it applies: The results are from laboratory-scale column leach tests using 59 to 65 kg of material.
Evidence · text
“Three columns containing approximately 59 to 65 kg of material were prepared”
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: The release mentions the use of multiple large-mass Photon assays to reduce sampling uncertainty.
Evidence · text
“Multiple large-mass Photon assays were used to reduce sampling uncertainty”
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: Wesley Whymark, P.Geo., CEO and Director, is named as the Qualified Person responsible for the technical content.
Evidence · text
“The Qualified Person responsible for the technical content of this news release is Wesley Whymark, P.Geo.”
Extracted facts
Stored fact records: 9. Some facts used in scoring do not have a stored record.
Metallurgical Results (9)
column leachgoldRecovery: 64.3 %Head Grade: 2.694Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- IVS
Test Work
- Program Status
- preliminary
- Test Type
- column leach
- Processing Route
- heap leach
- Sample
- Column A -1/4 inch crush size
- Leach Time
- 648 hours
Recovery
- Recovery
- 64.3 %
- Recovery Basis
- actual_test
- Head Grade
- 2.694
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 1.14 kg/t
- Lime
- 0 kg/t
Lab
- Laboratory
- Process Mineralogical Consulting Ltd.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-06T00:00:00.000Z
Reasoning: Strong recovery profile for a heap leach route with low reagent consumption.
Positive factors
- low cyanide consumption
- front-loaded recovery
Evidence · table
“64.3%”
Context: 2.694
column leachgoldRecovery: 72 %Head Grade: 2.694Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- IVS
Test Work
- Program Status
- preliminary
- Test Type
- column leach
- Processing Route
- heap leach
- Sample
- Column A -1/4 inch crush size
- Leach Time
- 1152 hours
Recovery
- Recovery
- 72 %
- Recovery Basis
- actual_test
- Head Grade
- 2.694
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 1.14 kg/t
- Lime
- 0 kg/t
Lab
- Laboratory
- Process Mineralogical Consulting Ltd.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-06T00:00:00.000Z
Reasoning: Significant recovery achieved within 48 days.
Positive factors
- front-loaded recovery
Evidence · table
“72.0%”
Context: 2.694
column leachgoldRecovery: 74.5 %Head Grade: 2.694Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- IVS
Test Work
- Program Status
- preliminary
- Test Type
- column leach
- Processing Route
- heap leach
- Sample
- Column A -1/4 inch crush size
- Leach Time
- 1872 hours
Recovery
- Recovery
- 74.5 %
- Recovery Basis
- actual_test
- Head Grade
- 2.694
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 1.14 kg/t
- Lime
- 0 kg/t
Lab
- Laboratory
- Process Mineralogical Consulting Ltd.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-06T00:00:00.000Z
Reasoning: Highest recovery achieved in the test series.
Evidence · table
“74.5%”
Context: 2.694
column leachgoldRecovery: 53.1 %Head Grade: 1.514Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- IVS
Test Work
- Program Status
- preliminary
- Test Type
- column leach
- Processing Route
- heap leach
- Sample
- Column B -3/8 inch crush size
- Leach Time
- 648 hours
Recovery
- Recovery
- 53.1 %
- Recovery Basis
- actual_test
- Head Grade
- 1.514
- Head Grade Unit
- g/t
Lab
- Laboratory
- Process Mineralogical Consulting Ltd.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-06T00:00:00.000Z
Reasoning: Lower recovery compared to the -1/4 inch column.
Negative factors
- lower recovery
Evidence · table
“53.1%”
Context: 1.514
column leachgoldRecovery: 60 %Head Grade: 1.514Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- IVS
Test Work
- Program Status
- preliminary
- Test Type
- column leach
- Processing Route
- heap leach
- Sample
- Column B -3/8 inch crush size
- Leach Time
- 1152 hours
Recovery
- Recovery
- 60 %
- Recovery Basis
- actual_test
- Head Grade
- 1.514
- Head Grade Unit
- g/t
Lab
- Laboratory
- Process Mineralogical Consulting Ltd.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-06T00:00:00.000Z
Reasoning: Moderate recovery.
Evidence · table
“60.0%”
Context: 1.514
column leachgoldRecovery: 66.9 %Head Grade: 1.514Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- IVS
Test Work
- Program Status
- preliminary
- Test Type
- column leach
- Processing Route
- heap leach
- Sample
- Column B -3/8 inch crush size
- Leach Time
- 1872 hours
Recovery
- Recovery
- 66.9 %
- Recovery Basis
- actual_test
- Head Grade
- 1.514
- Head Grade Unit
- g/t
Lab
- Laboratory
- Process Mineralogical Consulting Ltd.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-06T00:00:00.000Z
Reasoning: Recovery improving over time.
Evidence · table
“66.9%”
Context: 1.514
column leachgoldRecovery: 61.1 %Head Grade: 1.91Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- IVS
Test Work
- Program Status
- preliminary
- Test Type
- column leach
- Processing Route
- heap leach
- Sample
- Column C -1/2 inch crush size
- Leach Time
- 648 hours
Recovery
- Recovery
- 61.1 %
- Recovery Basis
- actual_test
- Head Grade
- 1.91
- Head Grade Unit
- g/t
Lab
- Laboratory
- Process Mineralogical Consulting Ltd.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-06T00:00:00.000Z
Reasoning: Moderate recovery.
Evidence · table
“61.1%”
Context: 1.910
column leachgoldRecovery: 65.1 %Head Grade: 1.91Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- IVS
Test Work
- Program Status
- preliminary
- Test Type
- column leach
- Processing Route
- heap leach
- Sample
- Column C -1/2 inch crush size
- Leach Time
- 1152 hours
Recovery
- Recovery
- 65.1 %
- Recovery Basis
- actual_test
- Head Grade
- 1.91
- Head Grade Unit
- g/t
Lab
- Laboratory
- Process Mineralogical Consulting Ltd.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-06T00:00:00.000Z
Reasoning: Moderate recovery.
Evidence · table
“65.1%”
Context: 1.910
column leachgoldRecovery: 69.5 %Head Grade: 1.91Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- IVS
Test Work
- Program Status
- preliminary
- Test Type
- column leach
- Processing Route
- heap leach
- Sample
- Column C -1/2 inch crush size
- Leach Time
- 1872 hours
Recovery
- Recovery
- 69.5 %
- Recovery Basis
- actual_test
- Head Grade
- 1.91
- Head Grade Unit
- g/t
Lab
- Laboratory
- Process Mineralogical Consulting Ltd.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-06T00:00:00.000Z
Reasoning: Recovery improving over time.
Evidence · table
“69.5%”
Context: 1.910
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.