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

Canonical Atlas analysis: https://atlas-staging.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--ae8ffa83-9d16-4827-bd66-53925f9c1636

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: 2026-08-26 07:02:22 UTC

Narrative sentiment: 0.80 · Bullish

## Minestarters Atlas 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 factor: High metal recoveries \(80-97%\)

- Positive factor: Significant grade upgrading \(doubling potential feed grade\)

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

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

Facts used in scoring: 12

## Classification and evidence

**High Recovery**

Polarity: positive

Definition: 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)

### sorting

[Link to this fact](https://atlas-staging.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--ae8ffa83-9d16-4827-bd66-53925f9c1636#fact-metallurgical-facts-0)

gold

Historical result

Needs review: historical\_restatement

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

- Positive factor: Significant grade upgrade from 2.31 to 4.29 g/t

Evidence · table

> 2.31

Context: BRX

### sorting

[Link to this fact](https://atlas-staging.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--ae8ffa83-9d16-4827-bd66-53925f9c1636#fact-metallurgical-facts-1)

silver

Historical result

Needs review: historical\_restatement

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

Evidence · table

> 88

Context: BRX

### sorting

[Link to this fact](https://atlas-staging.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--ae8ffa83-9d16-4827-bd66-53925f9c1636#fact-metallurgical-facts-2)

lead

Historical result

Needs review: historical\_restatement

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

Evidence · table

> 0.87

Context: BRX

### sorting

[Link to this fact](https://atlas-staging.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--ae8ffa83-9d16-4827-bd66-53925f9c1636#fact-metallurgical-facts-3)

zinc

Historical result

Needs review: historical\_restatement

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

Evidence · table

> 1.04

Context: BRX

### sorting

[Link to this fact](https://atlas-staging.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--ae8ffa83-9d16-4827-bd66-53925f9c1636#fact-metallurgical-facts-4)

gold

Historical result

Needs review: historical\_restatement

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

- Positive factor: Significant grade upgrade from 2.45 to 4.94 g/t

Evidence · table

> 2.45

Context: Klaza

### sorting

[Link to this fact](https://atlas-staging.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--ae8ffa83-9d16-4827-bd66-53925f9c1636#fact-metallurgical-facts-5)

silver

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

Evidence · table

> 63

Context: Klaza

### sorting

[Link to this fact](https://atlas-staging.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--ae8ffa83-9d16-4827-bd66-53925f9c1636#fact-metallurgical-facts-6)

lead

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

Evidence · table

> 0.67

Context: Klaza

### sorting

[Link to this fact](https://atlas-staging.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--ae8ffa83-9d16-4827-bd66-53925f9c1636#fact-metallurgical-facts-7)

zinc

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

Evidence · table

> 0.85

Context: Klaza

### sorting

[Link to this fact](https://atlas-staging.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--ae8ffa83-9d16-4827-bd66-53925f9c1636#fact-metallurgical-facts-8)

gold

#### 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 factor: Significant grade upgrade from 0.35 to 0.79 g/t

- Positive factor: Acceptable recovery \(80%\) for low-grade material

- Negative factor: Lower recovery \(80%\) compared to high-grade composites

Evidence · table

> 0.35

Context: Low Grade

### sorting

[Link to this fact](https://atlas-staging.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--ae8ffa83-9d16-4827-bd66-53925f9c1636#fact-metallurgical-facts-9)

silver

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

Evidence · table

> 29

Context: Low Grade

### sorting

[Link to this fact](https://atlas-staging.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--ae8ffa83-9d16-4827-bd66-53925f9c1636#fact-metallurgical-facts-10)

lead

#### 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 factor: Acceptable recovery \(89%\)

Evidence · table

> 0.17

Context: Low Grade

### sorting

[Link to this fact](https://atlas-staging.minestarters.com/news/rockhaven-reports-excellent-pre-concentration-results-for-the-klaza-deposit-yuko--ae8ffa83-9d16-4827-bd66-53925f9c1636#fact-metallurgical-facts-11)

zinc

#### 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 factor: 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.