# Rockhaven Reports Excellent Pre-Concentration Results for the Klaza Deposit, Yukon

Canonical Atlas analysis: https://atlas-extractions.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--74cb6fd7-a70f-4ced-9a79-63d8192c90a8

Original source: https://money.tmx.com/en/quote/RK/news/6552088200239091/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko

Publisher: tmx

Original announcement: 2023-09-12T12:05:00.000Z

Analysis by Minestarters Atlas

Atlas analysis published: Unknown date

Atlas analysis updated: Unknown date

- 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

Narrative sentiment: 0.80 · Bullish

## Minestarters Atlas 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 factor: Significant grade upgrade \(doubling\) via pre-concentration

- Positive factor: High metal recoveries \(80-97%\)

- Positive factor: Substantial mass pull reduction \(>50%\)

- Positive factor: Potential for lower CAPEX/OPEX and smaller circuits

Facts used in scoring: 12

## Classification and evidence

**Mill Route**

Polarity: neutral

Definition: 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 Disclosed**

Polarity: positive

Story-specific tag

Definition: 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 Route**

Polarity: neutral

Definition: Gravity separation forms a material part of the flowsheet.

Why it applies: the document describes a gravity route \("gravity"\)

**Multi-Domain Tested**

Polarity: positive

Definition: 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 sorting

[Link to this fact](https://atlas-extractions.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--74cb6fd7-a70f-4ced-9a79-63d8192c90a8#fact-metallurgical-facts-0)

Klaza · gold

#### 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 factor: High recovery \(92%\)

- Positive factor: Significant grade upgrade

Evidence · table

> 4.29

Context: 48

#### Tags used in scoring

**Mill Route**

Polarity: neutral

Definition: Processing via mill or concentrator \(CIL, CIP, tank leach, flotation\).

Why it applies: processing\_route matches the flotation signal

**Gravity Route**

Polarity: neutral

Definition: Gravity separation forms a material part of the flowsheet.

Why it applies: processing\_route matches the gravity signal

### XRT sorting

[Link to this fact](https://atlas-extractions.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--74cb6fd7-a70f-4ced-9a79-63d8192c90a8#fact-metallurgical-facts-1)

Klaza · silver

#### 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 factor: High silver recovery \(94%\)

Evidence · table

> 169

Context: 48

#### Tags used in scoring

**Mill Route**

Polarity: neutral

Definition: Processing via mill or concentrator \(CIL, CIP, tank leach, flotation\).

Why it applies: processing\_route matches the flotation signal

**Gravity Route**

Polarity: neutral

Definition: Gravity separation forms a material part of the flowsheet.

Why it applies: processing\_route matches the gravity signal

**High Recovery**

Polarity: positive

Definition: 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 sorting

[Link to this fact](https://atlas-extractions.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--74cb6fd7-a70f-4ced-9a79-63d8192c90a8#fact-metallurgical-facts-2)

Klaza · lead

#### 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 factor: Very high lead recovery \(97%\)

Evidence · table

> 1.71

Context: 48

#### Tags used in scoring

**Mill Route**

Polarity: neutral

Definition: Processing via mill or concentrator \(CIL, CIP, tank leach, flotation\).

Why it applies: processing\_route matches the flotation signal

**Gravity Route**

Polarity: neutral

Definition: Gravity separation forms a material part of the flowsheet.

Why it applies: processing\_route matches the gravity signal

### XRT sorting

[Link to this fact](https://atlas-extractions.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--74cb6fd7-a70f-4ced-9a79-63d8192c90a8#fact-metallurgical-facts-3)

Klaza · zinc

#### 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 factor: High zinc recovery \(92%\)

Evidence · table

> 1.99

Context: 48

#### Tags used in scoring

**Mill Route**

Polarity: neutral

Definition: Processing via mill or concentrator \(CIL, CIP, tank leach, flotation\).

Why it applies: processing\_route matches the flotation signal

**Gravity Route**

Polarity: neutral

Definition: Gravity separation forms a material part of the flowsheet.

Why it applies: processing\_route matches the gravity signal

### XRT sorting

[Link to this fact](https://atlas-extractions.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--74cb6fd7-a70f-4ced-9a79-63d8192c90a8#fact-metallurgical-facts-4)

Klaza · gold

#### 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 factor: High gold recovery \(93%\)

- Positive factor: Significant grade upgrade

Evidence · table

> 4.94

Context: 46

#### Tags used in scoring

**Mill Route**

Polarity: neutral

Definition: Processing via mill or concentrator \(CIL, CIP, tank leach, flotation\).

Why it applies: processing\_route matches the flotation signal

**Gravity Route**

Polarity: neutral

Definition: Gravity separation forms a material part of the flowsheet.

Why it applies: processing\_route matches the gravity signal

### XRT sorting

[Link to this fact](https://atlas-extractions.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--74cb6fd7-a70f-4ced-9a79-63d8192c90a8#fact-metallurgical-facts-5)

Klaza · silver

#### 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 factor: High silver recovery \(94%\)

Evidence · table

> 130

Context: 46

#### Tags used in scoring

**Mill Route**

Polarity: neutral

Definition: Processing via mill or concentrator \(CIL, CIP, tank leach, flotation\).

Why it applies: processing\_route matches the flotation signal

**Gravity Route**

Polarity: neutral

Definition: Gravity separation forms a material part of the flowsheet.

Why it applies: processing\_route matches the gravity signal

**High Recovery**

Polarity: positive

Definition: 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 sorting

[Link to this fact](https://atlas-extractions.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--74cb6fd7-a70f-4ced-9a79-63d8192c90a8#fact-metallurgical-facts-6)

Klaza · lead

#### 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 factor: High lead recovery \(95%\)

Evidence · table

> 1.40

Context: 46

#### Tags used in scoring

**Mill Route**

Polarity: neutral

Definition: Processing via mill or concentrator \(CIL, CIP, tank leach, flotation\).

Why it applies: processing\_route matches the flotation signal

**Gravity Route**

Polarity: neutral

Definition: Gravity separation forms a material part of the flowsheet.

Why it applies: processing\_route matches the gravity signal

### XRT sorting

[Link to this fact](https://atlas-extractions.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--74cb6fd7-a70f-4ced-9a79-63d8192c90a8#fact-metallurgical-facts-7)

Klaza · zinc

#### 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 factor: High zinc recovery \(91%\)

Evidence · table

> 1.70

Context: 46

#### Tags used in scoring

**Mill Route**

Polarity: neutral

Definition: Processing via mill or concentrator \(CIL, CIP, tank leach, flotation\).

Why it applies: processing\_route matches the flotation signal

**Gravity Route**

Polarity: neutral

Definition: Gravity separation forms a material part of the flowsheet.

Why it applies: processing\_route matches the gravity signal

### XRT sorting

[Link to this fact](https://atlas-extractions.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--74cb6fd7-a70f-4ced-9a79-63d8192c90a8#fact-metallurgical-facts-8)

Klaza · gold

#### 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 factor: Successful upgrading of low-grade material

Evidence · table

> 0.79

Context: 35

#### Tags used in scoring

**Mill Route**

Polarity: neutral

Definition: Processing via mill or concentrator \(CIL, CIP, tank leach, flotation\).

Why it applies: processing\_route matches the flotation signal

**Gravity Route**

Polarity: neutral

Definition: Gravity separation forms a material part of the flowsheet.

Why it applies: processing\_route matches the gravity signal

### XRT sorting

[Link to this fact](https://atlas-extractions.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--74cb6fd7-a70f-4ced-9a79-63d8192c90a8#fact-metallurgical-facts-9)

Klaza · silver

#### 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 factor: High silver recovery \(93%\)

Evidence · table

> 77

Context: 35

#### Tags used in scoring

**Mill Route**

Polarity: neutral

Definition: Processing via mill or concentrator \(CIL, CIP, tank leach, flotation\).

Why it applies: processing\_route matches the flotation signal

**Gravity Route**

Polarity: neutral

Definition: Gravity separation forms a material part of the flowsheet.

Why it applies: processing\_route matches the gravity signal

**High Recovery**

Polarity: positive

Definition: 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 sorting

[Link to this fact](https://atlas-extractions.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--74cb6fd7-a70f-4ced-9a79-63d8192c90a8#fact-metallurgical-facts-10)

Klaza · lead

#### 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 factor: Effective upgrading of low-grade lead

Evidence · table

> 0.43

Context: 35

#### Tags used in scoring

**Mill Route**

Polarity: neutral

Definition: Processing via mill or concentrator \(CIL, CIP, tank leach, flotation\).

Why it applies: processing\_route matches the flotation signal

**Gravity Route**

Polarity: neutral

Definition: Gravity separation forms a material part of the flowsheet.

Why it applies: processing\_route matches the gravity signal

### XRT sorting

[Link to this fact](https://atlas-extractions.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--74cb6fd7-a70f-4ced-9a79-63d8192c90a8#fact-metallurgical-facts-11)

Klaza · zinc

#### 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 factor: Effective upgrading of low-grade zinc

Evidence · table

> 0.49

Context: 35

#### Tags used in scoring

**Mill Route**

Polarity: neutral

Definition: Processing via mill or concentrator \(CIL, CIP, tank leach, flotation\).

Why it applies: processing\_route matches the flotation signal

**Gravity Route**

Polarity: neutral

Definition: 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.