Rockhaven Reports Excellent Pre-Concentration Results for the Klaza Deposit, Yukon
Original announcement by tmx on
- Company
- Rockhaven Resources Ltd.
- Ticker
- RK
- Exchange
- TSX
- Region
- Yukon
- Primary commodity
- Gold
- Secondary commodities
- Silver, Lead, Zinc
- Document categories
- Metallurgy
- Extracted
- 2026-09-18 19:04:58 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Rockhaven Resources reported successful pre-concentration (ore sorting) test work at the Klaza deposit in the Yukon. The results showed that sorting can reject over 50% of the feed mass while doubling the grade of the remaining material, with high recoveries for gold, silver, lead, and zinc.
Reasoning: The test work demonstrates highly effective ore sorting (pre-concentration) that significantly upgrades the feed grade while maintaining high recoveries, which could materially improve the economics of the upcoming PFS.
Positive factors
- Significant grade upgrade (doubling) via pre-concentration
- High metal recoveries (80-97%)
- Substantial mass pull reduction (>50%)
- Potential for lower CAPEX/OPEX and smaller circuits
Facts used in scoring: 12
Classification and evidence
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: The test work is designed to optimize the feed for a future grinding and flotation circuit.
Evidence · text
“doubling the grade of material entering the mill”
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 names independent Qualified Persons (Chris Martin and Matthew R. Dumala) for the metallurgical and geological information.
Evidence · text
“provided and approved by Chris Martin, C.Eng. an independent consultant and qualified person”
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: 12. Some facts used in scoring do not have a stored record.
Metallurgical Results (12)
XRT sortingKlaza · goldRecovery: 92 %Head Grade: 2.31Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Klaza
- Commodity
- gold
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Program Status
- preliminary
- Test Type
- XRT sorting
- Processing Route
- crushing to 63mm, XRT sorting, gravity separation, flotation
- Sample
- BRX composite
Recovery
- Recovery
- 92 %
- Recovery Basis
- actual_test
- Head Grade
- 2.31
- Head Grade Unit
- g/t
- Conc. Grade
- 4.29
- Conc. Grade Unit
- g/t
- Mass Pull
- 48 %
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: Strong gold recovery and grade upgrade in the BRX composite.
Positive factors
- High recovery (92%)
- Significant grade upgrade
Evidence · table
“4.29”
Context: 48
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: processing_route matches the gravity signal
XRT sortingKlaza · silverRecovery: 94 %Head Grade: 88Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Klaza
- Commodity
- silver
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Program Status
- preliminary
- Test Type
- XRT sorting
- Processing Route
- crushing to 63mm, XRT sorting, gravity separation, flotation
- Sample
- BRX composite
Recovery
- Recovery
- 94 %
- Recovery Basis
- actual_test
- Head Grade
- 88
- Head Grade Unit
- g/t
- Conc. Grade
- 169
- Conc. Grade Unit
- g/t
- Mass Pull
- 48 %
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: High silver recovery and grade upgrade.
Positive factors
- High silver recovery (94%)
Evidence · table
“169”
Context: 48
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: processing_route matches the gravity signal
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: 94% is at or above the exceptional band (90%)
XRT sortingKlaza · leadRecovery: 97 %Head Grade: 0.87Head Grade Unit: %View all detailsHide details
Identity
- Project
- Klaza
- Commodity
- lead
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Program Status
- preliminary
- Test Type
- XRT sorting
- Processing Route
- crushing to 63mm, XRT sorting, gravity separation, flotation
- Sample
- BRX composite
Recovery
- Recovery
- 97 %
- Recovery Basis
- actual_test
- Head Grade
- 0.87
- Head Grade Unit
- %
- Conc. Grade
- 1.71
- Conc. Grade Unit
- %
- Mass Pull
- 48 %
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: Excellent lead recovery.
Positive factors
- Very high lead recovery (97%)
Evidence · table
“1.71”
Context: 48
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: processing_route matches the gravity signal
XRT sortingKlaza · zincRecovery: 92 %Head Grade: 1.04Head Grade Unit: %View all detailsHide details
Identity
- Project
- Klaza
- Commodity
- zinc
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Program Status
- preliminary
- Test Type
- XRT sorting
- Processing Route
- crushing to 63mm, XRT sorting, gravity separation, flotation
- Sample
- BRX composite
Recovery
- Recovery
- 92 %
- Recovery Basis
- actual_test
- Head Grade
- 1.04
- Head Grade Unit
- %
- Conc. Grade
- 1.99
- Conc. Grade Unit
- %
- Mass Pull
- 48 %
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: Strong zinc recovery.
Positive factors
- High zinc recovery (92%)
Evidence · table
“1.99”
Context: 48
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: processing_route matches the gravity signal
XRT sortingKlaza · goldRecovery: 93 %Head Grade: 2.45Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Klaza
- Commodity
- gold
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Program Status
- preliminary
- Test Type
- XRT sorting
- Processing Route
- crushing to 63mm, XRT sorting, gravity separation, flotation
- Sample
- Klaza composite
Recovery
- Recovery
- 93 %
- Recovery Basis
- actual_test
- Head Grade
- 2.45
- Head Grade Unit
- g/t
- Conc. Grade
- 4.94
- Conc. Grade Unit
- g/t
- Mass Pull
- 46 %
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: Strong gold recovery and grade upgrade in the Klaza composite.
Positive factors
- High gold recovery (93%)
- Significant grade upgrade
Evidence · table
“4.94”
Context: 46
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: processing_route matches the gravity signal
XRT sortingKlaza · silverRecovery: 94 %Head Grade: 63Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Klaza
- Commodity
- silver
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Program Status
- preliminary
- Test Type
- XRT sorting
- Processing Route
- crushing to 63mm, XRT sorting, gravity separation, flotation
- Sample
- Klaza composite
Recovery
- Recovery
- 94 %
- Recovery Basis
- actual_test
- Head Grade
- 63
- Head Grade Unit
- g/t
- Conc. Grade
- 130
- Conc. Grade Unit
- g/t
- Mass Pull
- 46 %
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: High silver recovery.
Positive factors
- High silver recovery (94%)
Evidence · table
“130”
Context: 46
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: processing_route matches the gravity signal
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: 94% is at or above the exceptional band (90%)
XRT sortingKlaza · leadRecovery: 95 %Head Grade: 0.67Head Grade Unit: %View all detailsHide details
Identity
- Project
- Klaza
- Commodity
- lead
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Program Status
- preliminary
- Test Type
- XRT sorting
- Processing Route
- crushing to 63mm, XRT sorting, gravity separation, flotation
- Sample
- Klaza composite
Recovery
- Recovery
- 95 %
- Recovery Basis
- actual_test
- Head Grade
- 0.67
- Head Grade Unit
- %
- Conc. Grade
- 1.4
- Conc. Grade Unit
- %
- Mass Pull
- 46 %
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: Excellent lead recovery.
Positive factors
- High lead recovery (95%)
Evidence · table
“1.40”
Context: 46
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: processing_route matches the gravity signal
XRT sortingKlaza · zincRecovery: 91 %Head Grade: 0.85Head Grade Unit: %View all detailsHide details
Identity
- Project
- Klaza
- Commodity
- zinc
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Program Status
- preliminary
- Test Type
- XRT sorting
- Processing Route
- crushing to 63mm, XRT sorting, gravity separation, flotation
- Sample
- Klaza composite
Recovery
- Recovery
- 91 %
- Recovery Basis
- actual_test
- Head Grade
- 0.85
- Head Grade Unit
- %
- Conc. Grade
- 1.7
- Conc. Grade Unit
- %
- Mass Pull
- 46 %
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: Strong zinc recovery.
Positive factors
- High zinc recovery (91%)
Evidence · table
“1.70”
Context: 46
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: processing_route matches the gravity signal
XRT sortingKlaza · goldRecovery: 80 %Head Grade: 0.35Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Klaza
- Commodity
- gold
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Program Status
- preliminary
- Test Type
- XRT sorting
- Processing Route
- crushing to 63mm, XRT sorting, gravity separation, flotation
- Sample
- Low Grade composite
Recovery
- Recovery
- 80 %
- Recovery Basis
- actual_test
- Head Grade
- 0.35
- Head Grade Unit
- g/t
- Conc. Grade
- 0.79
- Conc. Grade Unit
- g/t
- Mass Pull
- 35 %
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: Encouraging results for low-grade material, doubling the grade with 80% gold recovery.
Positive factors
- Successful upgrading of low-grade material
Evidence · table
“0.79”
Context: 35
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: processing_route matches the gravity signal
XRT sortingKlaza · silverRecovery: 93 %Head Grade: 29Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Klaza
- Commodity
- silver
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Program Status
- preliminary
- Test Type
- XRT sorting
- Processing Route
- crushing to 63mm, XRT sorting, gravity separation, flotation
- Sample
- Low Grade composite
Recovery
- Recovery
- 93 %
- Recovery Basis
- actual_test
- Head Grade
- 29
- Head Grade Unit
- g/t
- Conc. Grade
- 77
- Conc. Grade Unit
- g/t
- Mass Pull
- 35 %
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: High silver recovery in low-grade material.
Positive factors
- High silver recovery (93%)
Evidence · table
“77”
Context: 35
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: processing_route matches the gravity signal
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: 93% is at or above the exceptional band (90%)
XRT sortingKlaza · leadRecovery: 89 %Head Grade: 0.17Head Grade Unit: %View all detailsHide details
Identity
- Project
- Klaza
- Commodity
- lead
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Program Status
- preliminary
- Test Type
- XRT sorting
- Processing Route
- crushing to 63mm, XRT sorting, gravity separation, flotation
- Sample
- Low Grade composite
Recovery
- Recovery
- 89 %
- Recovery Basis
- actual_test
- Head Grade
- 0.17
- Head Grade Unit
- %
- Conc. Grade
- 0.43
- Conc. Grade Unit
- %
- Mass Pull
- 35 %
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: Effective upgrading of low-grade lead.
Positive factors
- Effective upgrading of low-grade lead
Evidence · table
“0.43”
Context: 35
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: processing_route matches the gravity signal
XRT sortingKlaza · zincRecovery: 85 %Head Grade: 0.21Head Grade Unit: %View all detailsHide details
Identity
- Project
- Klaza
- Commodity
- zinc
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Program Status
- preliminary
- Test Type
- XRT sorting
- Processing Route
- crushing to 63mm, XRT sorting, gravity separation, flotation
- Sample
- Low Grade composite
Recovery
- Recovery
- 85 %
- Recovery Basis
- actual_test
- Head Grade
- 0.21
- Head Grade Unit
- %
- Conc. Grade
- 0.49
- Conc. Grade Unit
- %
- Mass Pull
- 35 %
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: Effective upgrading of low-grade zinc.
Positive factors
- Effective upgrading of low-grade zinc
Evidence · table
“0.49”
Context: 35
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: processing_route matches the gravity 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.