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
- 2026-08-26 07:02:22 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Rockhaven Resources reported successful pre-concentration (ore sorting) test work at its Klaza deposit in the Yukon. The results showed that rejecting over 50% of the feed mass could approximately double the grade of the material sent to the mill while maintaining high metal recoveries.
Reasoning: The pre-concentration test work successfully demonstrated significant grade upgrading and mass rejection with high metal recoveries, which could materially improve project economics.
Positive factors
- High metal recoveries (80-97%)
- Significant grade upgrading (doubling potential feed grade)
- Substantial mass rejection (>50%)
- Potential for lower CAPEX/OPEX via smaller circuits
Facts used in scoring: 12
Classification and evidence
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: Recoveries for BRX and Klaza composites are in the exceptional/strong bands (91-97%).
Evidence · text
“maintaining average recoveries of 93% for Au, 94% for Ag, 96% for Pb and 92% for Zn”
Extracted facts
Stored fact records: 12. Some facts used in scoring do not have a stored record.
Metallurgical Results (12)
sortinggoldRecovery: 92 %Head Grade: 2.31Head Grade Unit: g/tHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- RK
Test Work
- Program Status
- detailed
- Test Type
- sorting
- Sample
- BRX composite feed
Recovery
- Recovery
- 92 %
- Recovery Basis
- actual_test
- Head Grade
- 2.31
- Head Grade Unit
- g/t
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2018-06-21T00:00:00.000Z
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: Strong recovery and grade upgrade for the BRX composite.
Positive factors
- High recovery (92%)
- Significant grade upgrade from 2.31 to 4.29 g/t
Evidence · table
“2.31”
Context: BRX
sortingsilverRecovery: 94 %Head Grade: 88Head Grade Unit: g/tHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Commodity
- silver
- Ticker
- RK
Test Work
- Program Status
- detailed
- Test Type
- sorting
- Sample
- BRX composite feed
Recovery
- Recovery
- 94 %
- Recovery Basis
- actual_test
- Head Grade
- 88
- Head Grade Unit
- g/t
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2018-06-21T00:00:00.000Z
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: High silver recovery in the BRX composite.
Positive factors
- High recovery (94%)
Evidence · table
“88”
Context: BRX
sortingleadRecovery: 97 %Head Grade: 0.87Head Grade Unit: %Historical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Commodity
- lead
- Ticker
- RK
Test Work
- Program Status
- detailed
- Test Type
- sorting
- Sample
- BRX composite feed
Recovery
- Recovery
- 97 %
- Recovery Basis
- actual_test
- Head Grade
- 0.87
- Head Grade Unit
- %
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2018-06-21T00:00:00.000Z
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: Excellent lead recovery in the BRX composite.
Positive factors
- Very high recovery (97%)
Evidence · table
“0.87”
Context: BRX
sortingzincRecovery: 92 %Head Grade: 1.04Head Grade Unit: %Historical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Commodity
- zinc
- Ticker
- RK
Test Work
- Program Status
- detailed
- Test Type
- sorting
- Sample
- BRX composite feed
Recovery
- Recovery
- 92 %
- Recovery Basis
- actual_test
- Head Grade
- 1.04
- Head Grade Unit
- %
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2018-06-21T00:00:00.000Z
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: High zinc recovery in the BRX composite.
Positive factors
- High recovery (92%)
Evidence · table
“1.04”
Context: BRX
sortinggoldRecovery: 93 %Head Grade: 2.45Head Grade Unit: g/tHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- RK
Test Work
- Program Status
- detailed
- Test Type
- sorting
- Sample
- Klaza composite feed
Recovery
- Recovery
- 93 %
- Recovery Basis
- actual_test
- Head Grade
- 2.45
- Head Grade Unit
- g/t
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2018-06-21T00:00:00.000Z
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: Strong gold recovery and grade upgrade for the Klaza composite.
Positive factors
- High recovery (93%)
- Significant grade upgrade from 2.45 to 4.94 g/t
Evidence · table
“2.45”
Context: Klaza
sortingsilverRecovery: 94 %Head Grade: 63Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- silver
- Ticker
- RK
Test Work
- Program Status
- detailed
- Test Type
- sorting
- Sample
- Klaza composite feed
Recovery
- Recovery
- 94 %
- Recovery Basis
- actual_test
- Head Grade
- 63
- Head Grade Unit
- g/t
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 the Klaza composite.
Positive factors
- High recovery (94%)
Evidence · table
“63”
Context: Klaza
sortingleadRecovery: 95 %Head Grade: 0.67Head Grade Unit: %View all detailsHide details
Identity
- Commodity
- lead
- Ticker
- RK
Test Work
- Program Status
- detailed
- Test Type
- sorting
- Sample
- Klaza composite feed
Recovery
- Recovery
- 95 %
- Recovery Basis
- actual_test
- Head Grade
- 0.67
- Head Grade Unit
- %
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 in the Klaza composite.
Positive factors
- High recovery (95%)
Evidence · table
“0.67”
Context: Klaza
sortingzincRecovery: 91 %Head Grade: 0.85Head Grade Unit: %View all detailsHide details
Identity
- Commodity
- zinc
- Ticker
- RK
Test Work
- Program Status
- detailed
- Test Type
- sorting
- Sample
- Klaza composite feed
Recovery
- Recovery
- 91 %
- Recovery Basis
- actual_test
- Head Grade
- 0.85
- Head Grade Unit
- %
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 zinc recovery in the Klaza composite.
Positive factors
- High recovery (91%)
Evidence · table
“0.85”
Context: Klaza
sortinggoldRecovery: 80 %Head Grade: 0.35Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- RK
Test Work
- Program Status
- detailed
- Test Type
- sorting
- Sample
- Low Grade composite feed
Recovery
- Recovery
- 80 %
- Recovery Basis
- actual_test
- Head Grade
- 0.35
- Head Grade Unit
- g/t
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: Successful upgrading of low-grade material, though recovery is lower than main composites.
Positive factors
- Significant grade upgrade from 0.35 to 0.79 g/t
- Acceptable recovery (80%) for low-grade material
Negative factors
- Lower recovery (80%) compared to high-grade composites
Evidence · table
“0.35”
Context: Low Grade
sortingsilverRecovery: 93 %Head Grade: 29Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- silver
- Ticker
- RK
Test Work
- Program Status
- detailed
- Test Type
- sorting
- Sample
- Low Grade composite feed
Recovery
- Recovery
- 93 %
- Recovery Basis
- actual_test
- Head Grade
- 29
- Head Grade Unit
- g/t
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 the low-grade composite.
Positive factors
- High recovery (93%)
Evidence · table
“29”
Context: Low Grade
sortingleadRecovery: 89 %Head Grade: 0.17Head Grade Unit: %View all detailsHide details
Identity
- Commodity
- lead
- Ticker
- RK
Test Work
- Program Status
- detailed
- Test Type
- sorting
- Sample
- Low Grade composite feed
Recovery
- Recovery
- 89 %
- Recovery Basis
- actual_test
- Head Grade
- 0.17
- Head Grade Unit
- %
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: Acceptable lead recovery in the low-grade composite.
Positive factors
- Acceptable recovery (89%)
Evidence · table
“0.17”
Context: Low Grade
sortingzincRecovery: 85 %Head Grade: 0.21Head Grade Unit: %View all detailsHide details
Identity
- Commodity
- zinc
- Ticker
- RK
Test Work
- Program Status
- detailed
- Test Type
- sorting
- Sample
- Low Grade composite feed
Recovery
- Recovery
- 85 %
- Recovery Basis
- actual_test
- Head Grade
- 0.21
- Head Grade Unit
- %
Lab
- Laboratory
- Saskatchewan Research Council Geoanalytical Laboratories (SRC)
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2023-09-12T00:00:00.000Z
Reasoning: Acceptable zinc recovery in the low-grade composite.
Positive factors
- Acceptable recovery (85%)
Evidence · table
“0.21”
Context: Low Grade
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.