Rockhaven Announces Improved Metallurgical Test Work Results on its Klaza Project, Yukon
Original announcement by tmx on
- Company
- Rockhaven Resources Ltd.
- Ticker
- RK
- Exchange
- TSX
- Region
- Yukon
- Primary commodity
- Gold
- Secondary commodities
- Silver, Lead, Zinc, Arsenic
- Document categories
- Metallurgy
- Extracted
- 2026-09-18 19:06:26 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Rockhaven has reported improved metallurgical results for the Klaza Project, demonstrating that a conventional flotation flowsheet can produce marketable concentrates for gold, silver, lead, zinc, and arsenopyrite. This optimized flowsheet eliminates the need for costly on-site pressure oxidation and is supported by successful dense media separation (DMS) pre-concentration test work.
Reasoning: The results demonstrate a significant flowsheet optimization that moves the project from a high-cost hydrometallurgical route to a conventional flotation route, substantially de-risking the economics.
Positive factors
- Elimination of on-site pressure oxidation (POX) reduces CAPEX/OPEX/permitting risk
- High metal recoveries achieved via conventional flotation
- DMS pre-concentration offers potential for lower cut-off grades and reduced tailings
- Marketable arsenopyrite concentrate identified for refractory gold
Negative factors
- Arsenic-rich concentrate attracts smelter penalties/fees
Facts used in scoring: 8
Classification and evidence
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: Test work utilized conventional flotation and dense media separation (DMS).
Evidence · text
“Gold recoveries of 82% and silver recoveries of 85% were obtained using conventional flotation”
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: Gold and silver recoveries in DMS and flotation are in the strong to exceptional bands for the respective routes.
Evidence · text
“Gold recoveries of 82% and silver recoveries of 85% were obtained using conventional flotation”
Refractory Orenegative
Ore requires oxidation/pressure treatment before recovery — a processing and recovery risk.
Why it applies: The presence of refractory gold in arsenopyrite is explicitly noted, though a marketable concentrate was found.
Evidence · text
“Refractory Gold Flotation... high-grade and marketable arsenopyrite concentrate containing most of the refractory gold.”
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: Technical information was approved by independent Qualified Persons (Chris Martin and Matthew R. Dumala).
Evidence · text
“Technical information related to the metallurgical test program were 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")
POX/BIOX Routeneutral
Pressure or bio-oxidation for refractory ore — high CAPEX and OPEX.
Why it applies: the document describes a pox_biox route ("pressure oxidation")
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: 8. Some facts used in scoring do not have a stored record.
Metallurgical Results (8)
Fact 1goldRecovery: 32 %View all detailsHide details
Identity
- Commodity
- gold
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Sample
- Master Composite-1 (MC-1) cleaned lead concentrate
Recovery
- Recovery
- 32 %
- Conc. Grade
- 210
- Conc. Grade Unit
- g/t
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-05-06T00:00:00.000Z
Reasoning: High grade gold in lead concentrate.
Positive factors
- High grade concentrate
Evidence · table
“210”
Context: 0.9
Tags used in scoring
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 32% is below the weak band (80%)
Fact 2silverRecovery: 57 %View all detailsHide details
Identity
- Commodity
- silver
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Sample
- Master Composite-1 (MC-1) cleaned lead concentrate
Recovery
- Recovery
- 57 %
- Conc. Grade
- 4997
- Conc. Grade Unit
- g/t
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-05-06T00:00:00.000Z
Reasoning: Exceptional silver grade in lead concentrate.
Positive factors
- Very high silver grade
Evidence · table
“4,997”
Context: 0.9
Tags used in scoring
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 57% is below the weak band (75%)
Fact 3leadRecovery: 83 %View all detailsHide details
Identity
- Commodity
- lead
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Sample
- Master Composite-1 (MC-1) cleaned lead concentrate
Recovery
- Recovery
- 83 %
- Conc. Grade
- 61.6
- Conc. Grade Unit
- %
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-05-06T00:00:00.000Z
Reasoning: Strong lead grade in concentrate.
Positive factors
- Strong lead grade
Evidence · table
“61.6”
Context: 0.9
Fact 4goldRecovery: 44 %View all detailsHide details
Identity
- Commodity
- gold
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Sample
- Master Composite-1 (MC-1) cleaned arsenopyrite concentrate
Recovery
- Recovery
- 44 %
- Conc. Grade
- 112
- Conc. Grade Unit
- g/t
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-05-06T00:00:00.000Z
Reasoning: High grade gold in arsenopyrite concentrate provides a way to avoid POX.
Positive factors
- High grade arsenopyrite concentrate
Negative factors
- Arsenic penalties
Evidence · table
“112”
Context: 2.2
Tags used in scoring
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 44% is below the weak band (80%)
Fact 5goldRecovery: 99 %Head Grade: 7.9Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- gold
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Sample
- Western BRX DMS test
Recovery
- Recovery
- 99 %
- Head Grade
- 7.9
- Head Grade Unit
- g/t
- Mass Pull
- 50 %
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-05-06T00:00:00.000Z
Reasoning: Very high gold recovery via DMS.
Positive factors
- Exceptional recovery
Evidence · table
“99.0”
Context: 32
Tags used in scoring
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: 99% is at or above the exceptional band (95%)
Fact 6silverRecovery: 98.4 %Head Grade: 92.2Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- silver
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Sample
- Western BRX DMS test
Recovery
- Recovery
- 98.4 %
- Head Grade
- 92.2
- Head Grade Unit
- g/t
- Mass Pull
- 50 %
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-05-06T00:00:00.000Z
Reasoning: High silver recovery via DMS.
Positive factors
- High silver recovery
Evidence · table
“98.4”
Context: 32
Tags used in scoring
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: 98.4% is at or above the exceptional band (90%)
Fact 7goldRecovery: 97.7 %Head Grade: 5Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- gold
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Sample
- Central Klaza DMS test
Recovery
- Recovery
- 97.7 %
- Head Grade
- 5
- Head Grade Unit
- g/t
- Mass Pull
- 50 %
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-05-06T00:00:00.000Z
Reasoning: High gold recovery via DMS.
Positive factors
- High gold recovery
Evidence · table
“97.7”
Context: 38
Tags used in scoring
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: 97.7% is at or above the exceptional band (95%)
Fact 8goldRecovery: 78.9 %Head Grade: 1.7Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- gold
- Region
- canada_yt
- Reported Region
- Yukon
- Ticker
- RK
Test Work
- Sample
- Western Klaza DMS test
Recovery
- Recovery
- 78.9 %
- Head Grade
- 1.7
- Head Grade Unit
- g/t
- Mass Pull
- 32.8 %
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-05-06T00:00:00.000Z
Reasoning: Lower gold recovery in Western Klaza zone.
Negative factors
- Lower recovery compared to other zones
Evidence · table
“78.9”
Context: 11
Tags used in scoring
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 78.9% 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.