BTR: Sandstone PFS Metallurgy Delivers 94% Gold Recovery
Original announcement by asx on
- Company
- Brightstar Resources Limited
- Ticker
- BTR
- Exchange
- ASX
- Region
- Western Australia
- Primary commodity
- Gold
- Secondary commodities
- None reported
- Document categories
- Metallurgy
- Extracted
- 2026-09-24 00:22:06 UTC
Analysis by Minestarters Atlas
Atlas analysis published:
Minestarters Atlas analysis
Summary
Brightstar Resources announced metallurgical testwork results for its Sandstone Gold Project, delivering average gold recoveries of 94% using a conventional gravity and CIL flowsheet. The results, which cover 80% of the 2.9Moz Mineral Resource, confirm a simple, low-cost processing route with high gravity gold recovery and low reagent consumption, supporting the ongoing Pre-Feasibility Study due in December Q4 2026.
Reasoning: PFS-level metallurgical testwork confirms high average gold recoveries of 95.7% (CIL) across 80% of the 2.9Moz Sandstone Gold Project, using a conventional gravity and CIL flowsheet, with low reagent consumption and no refractory characteristics, significantly de-risking the project's processing route.
Positive factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- JORC Compliant
Negative factors
- Deleterious Elements Present
Facts used in scoring: 13
Classification and evidence
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: The metallurgical testwork delivered average gold recoveries of 94% and overall CIL recoveries averaged 95.7%, which is at or above the exceptional band for the CIL processing route.
Evidence · text
“average gold recoveries of 94%”
Free Millingpositive
Simple, clean ore amenable to standard processing without oxidation.
Why it applies: The testwork identified no refractory recovery characteristics, preg-robbing, or other complex processing issues, indicating the ore is amenable to standard processing.
Evidence · text
“No refractory recovery characteristics have been identified in any deposit at Sandstone.”
Multi-Domain Testedpositive
Variability across ore domains (oxide, transition, fresh) has been addressed.
Why it applies: The testwork covered master and variability composites from nine deposits and included oxide, transitional, and fresh ore types, representing approximately 80% of the Sandstone Mineral Resource.
Evidence · text
“The deposits tested represent approximately 80% of the Sandstone Mineral Resource; results are being incorporated into the Sandstone PFS”
QP/CP Signedpositive · Story-specific tag
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: The metallurgical results are based on information reviewed by Mr Alex Borger, a Member of The Australasian Institute of Mining and Metallurgy (AusIMM), who qualifies as a Competent Person.
Evidence · text
“Mr Alex Borger, BSc (Extractive Metallurgy and Chemistry), who is a Member of The Australasian Institute of Mining and Metallurgy (AusIMM).”
JORC Compliantpositive · Story-specific tag
Resource estimate prepared in compliance with JORC Code (Australia) — high reporting standard.
Why it applies: The Competent Person Statement confirms that the information is reported in accordance with the JORC Code 2012.
Evidence · text
“Competent Person as defined in the 2012 Edition of the “Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves” (JORC Code 2012).”
PFS-Supportingneutral · Story-specific tag
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: The metallurgical testwork program is being completed as part of the Pre-Feasibility Study (PFS) on the Sandstone Gold Project.
Evidence · text
“metallurgical testwork program being completed as part of the Pre-Feasibility Study (PFS) on its Sandstone Gold Project”
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: The confirmed processing route is a conventional gravity and carbon-in-leach (CIL) circuit, which is a mill-based process.
Evidence · text
“conventional gravity and carbon-in-leach (CIL) circuit”
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: A significant proportion of the gold is recoverable by gravity alone, with master composites averaging 42% gravity recovery.
Evidence · text
“A significant proportion of the gold is recoverable by gravity alone”
Deleterious Elements Presentnegative · Story-specific tag
Penalty elements (arsenic, antimony, etc.) or refractory concerns noted in the release.
Why it applies: While no refractory characteristics were identified, the report notes the presence of arsenic, tellurium, and bismuth in some composites, which will be assessed further.
Evidence · text
“Arsenic is highest in the Havilah fresh master composite (741ppm As)... Tellurium is low across the program except at Montague Boulder, where it correlates with bismuth (R2 = 0.97) and with leach residue gold grade (R2 = 0.98)”
Extracted facts
Stored fact records: 13. Some facts used in scoring do not have a stored record.
Metallurgical Results (13)
CILSandstone Gold Project · goldRecovery: 98.6 %Head Grade: 1.93Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Sandstone Gold Project
- Commodity
- gold
- Region
- australia_wa
- Reported Region
- Western Australia
- Ticker
- BTR
Test Work
- Program Status
- detailed
- Test Type
- CIL
- Processing Route
- conventional gravity and CIL flowsheet
- Sample
- Montague Boulder Transitional
- Grind P80
- 75 µm
- Leach Time
- 24 hours
Recovery
- Recovery
- 98.6 %
- Recovery Basis
- actual_test
- Head Grade
- 1.93
- Head Grade Unit
- g/t
- Tailings Grade
- 0.03
- Tailings Grade Unit
- g/t
Reagents
- Cyanide
- 0.15 kg/t
Lab
- Laboratory
- Metallurgy Pty Ltd and SGS Australia
- Consultant
- Independent Metallurgical Operations Pty Ltd and GR Engineering Services Limited
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-23T00:00:00.000Z
Reasoning: High CIL gold recovery of 98.6% for the Montague Boulder Transitional composite, well above the exceptional threshold for CIL, supports the project's processing amenability.
Positive factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- JORC Compliant
Negative factors
- Deleterious Elements Present
Evidence · table
“98.6”
Context: Montague Boulder Transitional
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the mill_cil 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: 98.6% is at or above the exceptional band (95%)
CILSandstone Gold Project · goldRecovery: 91.1 %Head Grade: 2.93Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Sandstone Gold Project
- Commodity
- gold
- Region
- australia_wa
- Reported Region
- Western Australia
- Ticker
- BTR
Test Work
- Program Status
- detailed
- Test Type
- CIL
- Processing Route
- conventional gravity and CIL flowsheet
- Sample
- Montague Boulder Fresh
- Grind P80
- 75 µm
- Leach Time
- 24 hours
Recovery
- Recovery
- 91.1 %
- Recovery Basis
- actual_test
- Head Grade
- 2.93
- Head Grade Unit
- g/t
- Tailings Grade
- 0.2
- Tailings Grade Unit
- g/t
Reagents
- Cyanide
- 0.14 kg/t
Lab
- Laboratory
- Metallurgy Pty Ltd and SGS Australia
- Consultant
- Independent Metallurgical Operations Pty Ltd and GR Engineering Services Limited
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-23T00:00:00.000Z
Reasoning: Strong CIL gold recovery of 91.1% for the Montague Boulder Fresh composite, above the strong threshold for CIL, supports the project's processing amenability.
Positive factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- JORC Compliant
Negative factors
- Deleterious Elements Present
Evidence · table
“91.1”
Context: Montague Boulder Fresh
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the mill_cil signal
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: processing_route matches the gravity signal
CILSandstone Gold Project · goldRecovery: 98.5 %Head Grade: 2.28Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Sandstone Gold Project
- Commodity
- gold
- Region
- australia_wa
- Reported Region
- Western Australia
- Ticker
- BTR
Test Work
- Program Status
- detailed
- Test Type
- CIL
- Processing Route
- conventional gravity and CIL flowsheet
- Sample
- Vanguard Oxide
- Grind P80
- 75 µm
- Leach Time
- 24 hours
Recovery
- Recovery
- 98.5 %
- Recovery Basis
- actual_test
- Head Grade
- 2.28
- Head Grade Unit
- g/t
- Tailings Grade
- 0.09
- Tailings Grade Unit
- g/t
Reagents
- Cyanide
- 0.14 kg/t
Lab
- Laboratory
- Metallurgy Pty Ltd and SGS Australia
- Consultant
- Independent Metallurgical Operations Pty Ltd and GR Engineering Services Limited
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-23T00:00:00.000Z
Reasoning: High CIL gold recovery of 98.5% for the Vanguard Oxide composite, well above the exceptional threshold for CIL, supports the project's processing amenability.
Positive factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- JORC Compliant
Negative factors
- Deleterious Elements Present
Evidence · table
“98.5”
Context: Vanguard Oxide
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the mill_cil 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: 98.5% is at or above the exceptional band (95%)
CILSandstone Gold Project · goldRecovery: 96.3 %Head Grade: 2.02Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Sandstone Gold Project
- Commodity
- gold
- Region
- australia_wa
- Reported Region
- Western Australia
- Ticker
- BTR
Test Work
- Program Status
- detailed
- Test Type
- CIL
- Processing Route
- conventional gravity and CIL flowsheet
- Sample
- Vanguard Transitional
- Grind P80
- 75 µm
- Leach Time
- 24 hours
Recovery
- Recovery
- 96.3 %
- Recovery Basis
- actual_test
- Head Grade
- 2.02
- Head Grade Unit
- g/t
- Tailings Grade
- 0.1
- Tailings Grade Unit
- g/t
Reagents
- Cyanide
- 0.46 kg/t
Lab
- Laboratory
- Metallurgy Pty Ltd and SGS Australia
- Consultant
- Independent Metallurgical Operations Pty Ltd and GR Engineering Services Limited
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-23T00:00:00.000Z
Reasoning: High CIL gold recovery of 96.3% for the Vanguard Transitional composite, well above the exceptional threshold for CIL, supports the project's processing amenability.
Positive factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- JORC Compliant
Negative factors
- Deleterious Elements Present
Evidence · table
“96.3”
Context: Vanguard Transitional
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the mill_cil 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: 96.3% is at or above the exceptional band (95%)
CILSandstone Gold Project · goldRecovery: 95.8 %Head Grade: 2.38Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Sandstone Gold Project
- Commodity
- gold
- Region
- australia_wa
- Reported Region
- Western Australia
- Ticker
- BTR
Test Work
- Program Status
- detailed
- Test Type
- CIL
- Processing Route
- conventional gravity and CIL flowsheet
- Sample
- Vanguard Fresh
- Grind P80
- 75 µm
- Leach Time
- 24 hours
Recovery
- Recovery
- 95.8 %
- Recovery Basis
- actual_test
- Head Grade
- 2.38
- Head Grade Unit
- g/t
- Tailings Grade
- 0.12
- Tailings Grade Unit
- g/t
Reagents
- Cyanide
- 0.27 kg/t
Lab
- Laboratory
- Metallurgy Pty Ltd and SGS Australia
- Consultant
- Independent Metallurgical Operations Pty Ltd and GR Engineering Services Limited
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-23T00:00:00.000Z
Reasoning: High CIL gold recovery of 95.8% for the Vanguard Fresh composite, well above the exceptional threshold for CIL, supports the project's processing amenability.
Positive factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- JORC Compliant
Negative factors
- Deleterious Elements Present
Evidence · table
“95.8”
Context: Vanguard Fresh
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the mill_cil 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: 95.8% is at or above the exceptional band (95%)
CILSandstone Gold Project · goldRecovery: 89.7 %Head Grade: 1.81Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Sandstone Gold Project
- Commodity
- gold
- Region
- australia_wa
- Reported Region
- Western Australia
- Ticker
- BTR
Test Work
- Program Status
- detailed
- Test Type
- CIL
- Processing Route
- conventional gravity and CIL flowsheet
- Sample
- Havilah Fresh
- Grind P80
- 75 µm
- Leach Time
- 24 hours
Recovery
- Recovery
- 89.7 %
- Recovery Basis
- actual_test
- Head Grade
- 1.81
- Head Grade Unit
- g/t
- Tailings Grade
- 0.18
- Tailings Grade Unit
- g/t
Reagents
- Cyanide
- 0.3 kg/t
Lab
- Laboratory
- Metallurgy Pty Ltd and SGS Australia
- Consultant
- Independent Metallurgical Operations Pty Ltd and GR Engineering Services Limited
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-23T00:00:00.000Z
Reasoning: Moderate CIL gold recovery of 89.7% for the Havilah Fresh composite, just below the strong threshold for CIL, but still within an economic range, supporting processing amenability despite elevated arsenic.
Positive factors
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- JORC Compliant
Negative factors
- Deleterious Elements Present
Evidence · table
“89.7”
Context: Havilah Fresh
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the mill_cil signal
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: processing_route matches the gravity signal
CILSandstone Gold Project · goldRecovery: 92.9 %Head Grade: 1.48Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Sandstone Gold Project
- Commodity
- gold
- Region
- australia_wa
- Reported Region
- Western Australia
- Ticker
- BTR
Test Work
- Program Status
- detailed
- Test Type
- CIL
- Processing Route
- conventional gravity and CIL flowsheet
- Sample
- Lord Nelson Fresh
- Grind P80
- 75 µm
- Leach Time
- 24 hours
Recovery
- Recovery
- 92.9 %
- Recovery Basis
- actual_test
- Head Grade
- 1.48
- Head Grade Unit
- g/t
- Tailings Grade
- 0.18
- Tailings Grade Unit
- g/t
Reagents
- Cyanide
- 0.3 kg/t
Lab
- Laboratory
- Metallurgy Pty Ltd and SGS Australia
- Consultant
- Independent Metallurgical Operations Pty Ltd and GR Engineering Services Limited
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-23T00:00:00.000Z
Reasoning: Strong CIL gold recovery of 92.9% for the Lord Nelson Fresh composite, above the strong threshold for CIL, supports the project's processing amenability.
Positive factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- JORC Compliant
Negative factors
- Deleterious Elements Present
Evidence · table
“92.9”
Context: Lord Nelson Fresh
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the mill_cil signal
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: processing_route matches the gravity signal
CILSandstone Gold Project · goldRecovery: 95.8 %Head Grade: 1.07Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Sandstone Gold Project
- Commodity
- gold
- Region
- australia_wa
- Reported Region
- Western Australia
- Ticker
- BTR
Test Work
- Program Status
- detailed
- Test Type
- CIL
- Processing Route
- conventional gravity and CIL flowsheet
- Sample
- Lord Henry Fresh
- Grind P80
- 75 µm
- Leach Time
- 24 hours
Recovery
- Recovery
- 95.8 %
- Recovery Basis
- actual_test
- Head Grade
- 1.07
- Head Grade Unit
- g/t
- Tailings Grade
- 0.07
- Tailings Grade Unit
- g/t
Reagents
- Cyanide
- 0.2 kg/t
Lab
- Laboratory
- Metallurgy Pty Ltd and SGS Australia
- Consultant
- Independent Metallurgical Operations Pty Ltd and GR Engineering Services Limited
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-23T00:00:00.000Z
Reasoning: High CIL gold recovery of 95.8% for the Lord Henry Fresh composite, well above the exceptional threshold for CIL, supports the project's processing amenability.
Positive factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- JORC Compliant
Negative factors
- Deleterious Elements Present
Evidence · table
“95.8”
Context: Lord Henry Fresh
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the mill_cil 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: 95.8% is at or above the exceptional band (95%)
CILSandstone Gold Project · goldRecovery: 97.2 %Head Grade: 1.44Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Sandstone Gold Project
- Commodity
- gold
- Region
- australia_wa
- Reported Region
- Western Australia
- Ticker
- BTR
Test Work
- Program Status
- detailed
- Test Type
- CIL
- Processing Route
- conventional gravity and CIL flowsheet
- Sample
- Achilles Fresh
- Grind P80
- 75 µm
- Leach Time
- 24 hours
Recovery
- Recovery
- 97.2 %
- Recovery Basis
- actual_test
- Head Grade
- 1.44
- Head Grade Unit
- g/t
- Tailings Grade
- 0.07
- Tailings Grade Unit
- g/t
Reagents
- Cyanide
- 0.21 kg/t
Lab
- Laboratory
- Metallurgy Pty Ltd and SGS Australia
- Consultant
- Independent Metallurgical Operations Pty Ltd and GR Engineering Services Limited
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-23T00:00:00.000Z
Reasoning: High CIL gold recovery of 97.2% for the Achilles Fresh composite, well above the exceptional threshold for CIL, supports the project's processing amenability.
Positive factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- JORC Compliant
Negative factors
- Deleterious Elements Present
Evidence · table
“97.2”
Context: Achilles Fresh
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the mill_cil 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: 97.2% is at or above the exceptional band (95%)
CILSandstone Gold Project · goldRecovery: 97.3 %Head Grade: 2.1Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Sandstone Gold Project
- Commodity
- gold
- Region
- australia_wa
- Reported Region
- Western Australia
- Ticker
- BTR
Test Work
- Program Status
- detailed
- Test Type
- CIL
- Processing Route
- conventional gravity and CIL flowsheet
- Sample
- Whistler Fresh
- Grind P80
- 75 µm
- Leach Time
- 24 hours
Recovery
- Recovery
- 97.3 %
- Recovery Basis
- actual_test
- Head Grade
- 2.1
- Head Grade Unit
- g/t
- Tailings Grade
- 0.04
- Tailings Grade Unit
- g/t
Reagents
- Cyanide
- 0.17 kg/t
Lab
- Laboratory
- Metallurgy Pty Ltd and SGS Australia
- Consultant
- Independent Metallurgical Operations Pty Ltd and GR Engineering Services Limited
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-23T00:00:00.000Z
Reasoning: High CIL gold recovery of 97.3% for the Whistler Fresh composite, well above the exceptional threshold for CIL, supports the project's processing amenability.
Positive factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- JORC Compliant
Negative factors
- Deleterious Elements Present
Evidence · table
“97.3”
Context: Whistler Fresh
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the mill_cil 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: 97.3% is at or above the exceptional band (95%)
CILSandstone Gold Project · goldRecovery: 95 %Head Grade: 1.11Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Sandstone Gold Project
- Commodity
- gold
- Region
- australia_wa
- Reported Region
- Western Australia
- Ticker
- BTR
Test Work
- Program Status
- detailed
- Test Type
- CIL
- Processing Route
- conventional gravity and CIL flowsheet
- Sample
- Two Mile Hill Fresh (MC1)
- Grind P80
- 75 µm
- Leach Time
- 24 hours
Recovery
- Recovery
- 95 %
- Recovery Basis
- actual_test
- Head Grade
- 1.11
- Head Grade Unit
- g/t
- Tailings Grade
- 0.09
- Tailings Grade Unit
- g/t
Reagents
- Cyanide
- 0.14 kg/t
Lab
- Laboratory
- Metallurgy Pty Ltd and SGS Australia
- Consultant
- Independent Metallurgical Operations Pty Ltd and GR Engineering Services Limited
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-23T00:00:00.000Z
Reasoning: High CIL gold recovery of 95.0% for the Two Mile Hill Fresh (MC1) composite, at the exceptional threshold for CIL, supports the project's processing amenability.
Positive factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- JORC Compliant
Negative factors
- Deleterious Elements Present
Evidence · table
“95.0”
Context: Two Mile Hill Fresh (MC1)
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the mill_cil 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: 95% is at or above the exceptional band (95%)
CILSandstone Gold Project · goldRecovery: 99.3 %Head Grade: 3.77Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Sandstone Gold Project
- Commodity
- gold
- Region
- australia_wa
- Reported Region
- Western Australia
- Ticker
- BTR
Test Work
- Program Status
- detailed
- Test Type
- CIL
- Processing Route
- conventional gravity and CIL flowsheet
- Sample
- Two Mile Hill Fresh (MC2)
- Grind P80
- 75 µm
- Leach Time
- 24 hours
Recovery
- Recovery
- 99.3 %
- Recovery Basis
- actual_test
- Head Grade
- 3.77
- Head Grade Unit
- g/t
- Tailings Grade
- 0.08
- Tailings Grade Unit
- g/t
Reagents
- Cyanide
- 0.13 kg/t
Lab
- Laboratory
- Metallurgy Pty Ltd and SGS Australia
- Consultant
- Independent Metallurgical Operations Pty Ltd and GR Engineering Services Limited
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-23T00:00:00.000Z
Reasoning: Exceptional CIL gold recovery of 99.3% for the Two Mile Hill Fresh (MC2) composite, well above the exceptional threshold for CIL, strongly supports the project's processing amenability.
Positive factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- JORC Compliant
Negative factors
- Deleterious Elements Present
Evidence · table
“99.3”
Context: Two Mile Hill Fresh (MC2)
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the mill_cil 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: 99.3% is at or above the exceptional band (95%)
CILSandstone Gold Project · goldRecovery: 96.7 %Head Grade: 2.17Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Sandstone Gold Project
- Commodity
- gold
- Region
- australia_wa
- Reported Region
- Western Australia
- Ticker
- BTR
Test Work
- Program Status
- detailed
- Test Type
- CIL
- Processing Route
- conventional gravity and CIL flowsheet
- Sample
- Indomitable Oxide
- Grind P80
- 75 µm
- Leach Time
- 24 hours
Recovery
- Recovery
- 96.7 %
- Recovery Basis
- actual_test
- Head Grade
- 2.17
- Head Grade Unit
- g/t
- Tailings Grade
- 0.06
- Tailings Grade Unit
- g/t
Reagents
- Cyanide
- 0.36 kg/t
Lab
- Laboratory
- Metallurgy Pty Ltd and SGS Australia
- Consultant
- Independent Metallurgical Operations Pty Ltd and GR Engineering Services Limited
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-23T00:00:00.000Z
Reasoning: High CIL gold recovery of 96.7% for the Indomitable Oxide composite, well above the exceptional threshold for CIL, supports the project's processing amenability.
Positive factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- JORC Compliant
Negative factors
- Deleterious Elements Present
Evidence · table
“96.7”
Context: Indomitable Oxide
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the mill_cil 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: 96.7% is at or above the exceptional band (95%)
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.