Inventus Reports Up to 75% Gold Recovery from Heap Leach Testwork at Pardo
Original announcement by tmx on
- Company
- Inventus Mining Corp.
- Ticker
- IVS
- Exchange
- TSX
- Region
- Ontario
- Primary commodity
- Gold
- Secondary commodities
- None reported
- Document categories
- Metallurgy
- Extracted
- 2026-09-14 06:24:00 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Inventus Mining Corp. reported positive gold heap leach test results at its Pardo Project in Ontario, with recoveries reaching up to 74.5% after 78 days. The results suggest a potential integrated processing strategy using 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 with favorable reagent profiles, though suitability for high-grade ore is questioned.
Positive factors
- responsive to cyanide leaching
- front-loaded recovery
- low cyanide consumption
- no lime addition required
Negative factors
- heap leach may not be preferred for higher-grade material
- performance on high-grade composite may not predict lower-grade response
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 metallurgical program evaluated gold recovery using column leach/heap leach testwork.
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 310 kg composites.
Evidence · text
“The results are laboratory-scale and pertain only to the samples tested.”
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”
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: 9. Some facts used in scoring do not have a stored record.
Metallurgical Results (9)
column leachPardo · goldRecovery: 64.3 %Head Grade: 2.694Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Pardo
- Commodity
- gold
- Region
- canada_on
- Reported Region
- Ontario
- 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
- Reagent Notes
- low total cyanide consumption of 1.14 kg/t over 78 days and required no lime addition to maintain optimal leach pH above 10.5
Lab
- Laboratory
- Process Mineralogical Consulting Ltd.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-06T00:00:00.000Z
Reasoning: Strong initial recovery and favorable reagent profile for the -1/4 inch crush size.
Positive factors
- front-loaded recovery
- low cyanide consumption
Evidence · table
“64.3%”
Context: 2.694
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
column leachPardo · goldRecovery: 72 %Head Grade: 2.694Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Pardo
- Commodity
- gold
- Region
- canada_on
- Reported Region
- Ontario
- 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
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
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
column leachPardo · goldRecovery: 74.5 %Head Grade: 2.694Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Pardo
- Commodity
- gold
- Region
- canada_on
- Reported Region
- Ontario
- 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
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 program.
Positive factors
- up to 75% recovery
Evidence · table
“74.5%”
Context: 2.694
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
column leachPardo · goldRecovery: 53.1 %Head Grade: 1.514Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Pardo
- Commodity
- gold
- Region
- canada_on
- Reported Region
- Ontario
- 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.
Evidence · table
“53.1%”
Context: 1.514
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
column leachPardo · goldRecovery: 60 %Head Grade: 1.514Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Pardo
- Commodity
- gold
- Region
- canada_on
- Reported Region
- Ontario
- 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
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
column leachPardo · goldRecovery: 66.9 %Head Grade: 1.514Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Pardo
- Commodity
- gold
- Region
- canada_on
- Reported Region
- Ontario
- 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: Moderate recovery.
Evidence · table
“66.9%”
Context: 1.514
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
column leachPardo · goldRecovery: 61.1 %Head Grade: 1.91Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Pardo
- Commodity
- gold
- Region
- canada_on
- Reported Region
- Ontario
- 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
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
column leachPardo · goldRecovery: 65.1 %Head Grade: 1.91Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Pardo
- Commodity
- gold
- Region
- canada_on
- Reported Region
- Ontario
- 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
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
column leachPardo · goldRecovery: 69.5 %Head Grade: 1.91Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Pardo
- Commodity
- gold
- Region
- canada_on
- Reported Region
- Ontario
- 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: Moderate recovery.
Evidence · table
“69.5%”
Context: 1.910
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
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.