GBM: 92% to 99% Gold Recovery in Flotation Testwork at Twin Hills
Original announcement by asx on
- Company
- GBM Resources Limited
- Ticker
- GBM
- Exchange
- ASX
- Region
- Queensland's Drummond Basin
- Primary commodity
- Gold
- Secondary commodities
- Silver, Arsenic, Sulfur, Carbon
- Document categories
- Metallurgy
- Extracted
- 2026-10-20 22:32:21 UTC
Analysis by Minestarters Atlas
Atlas analysis published:
Minestarters Atlas analysis
Summary
GBM Resources Limited announced highly encouraging initial metallurgical testwork results from its Twin Hills Gold Project, demonstrating gold recoveries of 92% to 99% into rougher flotation concentrates from both the 309 and Lone Sister deposits. These results, achieved using conventional flotation methods, provide strong confidence in a flotation-based processing option. While CIL results at Lone Sister were encouraging (87-89% recovery), the 309 deposit showed lower CIL extractions compared to historical data, necessitating further investigation and optimization before a preferred processing flowsheet can be determined.
Reasoning: Initial metallurgical testwork shows excellent gold recoveries (92-99%) via flotation at Twin Hills, providing strong confidence in conventional processing options. While CIL results at Lone Sister were encouraging, the 309 deposit showed lower CIL extractions compared to historical data, necessitating further investigation and optimization before a preferred processing flowsheet can be determined. The work is JORC compliant and signed off by a Competent Person.
Positive factors
- High Recovery
- QP/CP Signed
- JORC Compliant
- Mill Route
- Low arsenic content at 309
Negative factors
- Low Recovery
- Bench Scale Only
- Refractory Ore
- Single Domain Only
- Lower CIL extractions at 309 compared to historical
- Variability in gold assays and nugget effects at 309
- Further work required to determine preferred flowsheet
- Historical results not directly comparable due to sample differences
Low confidence — this extraction should be reviewed alongside the original source.
Facts used in scoring: 15
Classification and evidence
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: Gold recoveries of 92% to 99% in rougher concentrate are at or above the exceptional band for flotation.
Evidence · text
“gold recoveries of 92% to 99% in rougher concentrate”
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: CIL extractions of 25.2% and 47.5% for the 309 composite are significantly below the weak band for CIL processing.
Evidence · table
“25.2%”
Context: 75µm
Bench Scale Onlynegative
Only preliminary bench tests completed — no locked-cycle or pilot work.
Why it applies: The current testwork is described as an 'initial program of metallurgical characterisation, rougher flotation and cyanide leaching on composite samples'.
Evidence · text
“initial program of metallurgical characterisation, rougher flotation and cyanide leaching on composite samples”
Refractory Orenegative
Ore requires oxidation/pressure treatment before recovery — a processing and recovery risk.
Why it applies: The presence of elevated organic and graphitic carbon, and the need to incorporate activated carbon to mitigate potential preg-robbing effects, indicates refractory characteristics.
Evidence · text
“Elevated organic and graphitic carbon is present, although activated carbon was incorporated into the CIL tests to mitigate potential preg-robbing effects.”
Single Domain Onlynegative
Testing limited to one composite or domain — representativeness not established.
Why it applies: The program represents an 'initial assessment of the metallurgical response of selected mineralisation' and states that 'further testwork will investigate variability across the deposits'.
Evidence · text
“The current program represents an initial assessment of the metallurgical response of selected mineralisation. Further testwork will investigate variability across the deposits”
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 testwork results are reviewed by Mr Alasdair Noble of Metcor Pty Ltd, a Fellow of The Australasian Institute of Mining and Metallurgy (FAusIMM), who qualifies as a Competent Person.
Evidence · text
“The information in this announcement that relates to metallurgical testwork results is based on, and fairly represents, information from historical testwork and the current testwork program reviewed by Mr Alasdair Noble of Metcor Pty Ltd. Mr Noble is a metallurgist and is providing consultancy services to the Company. Mr Noble is a Fellow of The Australasian Institute of Mining and Metallurgy (FAusIMM).”
JORC Compliantpositive · Story-specific tag
Resource estimate prepared in compliance with JORC Code (Australia) — high reporting standard.
Why it applies: The Competent Person's Statement explicitly refers to the '2012 Edition of the “Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves”'.
Evidence · text
“Competent Person as defined in the 2012 Edition of the “Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves””
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: The testwork focuses on flotation and Carbon-in-Leach (CIL) processing, which are conventional mill-based routes.
Evidence · text
“rougher flotation and cyanide leaching on composite samples”
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: the document describes a gravity route ("gravity")
Multi-Domain Testedpositive
Variability across ore domains (oxide, transition, fresh) has been addressed.
Why it applies: 2 distinct composites were tested
Extracted facts
Stored fact records: 15. Some facts used in scoring do not have a stored record.
Metallurgical Results (15)
flotationTwin Hills · goldRecovery: 92 %Head Grade: 1.55Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Twin Hills
- Commodity
- gold
- Region
- australia_qld
- Reported Region
- Queensland's Drummond Basin
- Ticker
- GBM
Test Work
- Program Status
- preliminary
- Test Type
- flotation
- Processing Route
- conventional flotation
- Sample
- Lone Sister composite
- Grind P80
- 75 µm
Recovery
- Recovery
- 92 %
- Recovery Basis
- to_concentrate
- Head Grade
- 1.55
- Head Grade Unit
- g/t
- Conc. Grade
- 26
- Conc. Grade Unit
- g/t
- Mass Pull
- 4.8 %
Lab
- Laboratory
- Core Resources
- Consultant
- Alasdair Noble of Metcor Pty Ltd
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-10-20T00:00:00.000Z
Reasoning: High gold recovery of 92.0% at a low mass pull of 4.8% for the Lone Sister composite at 75µm grind size is a very positive initial flotation result.
Positive factors
- High Recovery
- Low mass pull
Evidence · table
“92.0%”
Context: 4.8%
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
flotationTwin Hills · goldRecovery: 91.9 %Head Grade: 1.55Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Twin Hills
- Commodity
- gold
- Region
- australia_qld
- Reported Region
- Queensland's Drummond Basin
- Ticker
- GBM
Test Work
- Program Status
- preliminary
- Test Type
- flotation
- Processing Route
- conventional flotation
- Sample
- Lone Sister composite
- Grind P80
- 45 µm
Recovery
- Recovery
- 91.9 %
- Recovery Basis
- to_concentrate
- Head Grade
- 1.55
- Head Grade Unit
- g/t
- Conc. Grade
- 17.5
- Conc. Grade Unit
- g/t
- Mass Pull
- 5.8 %
Lab
- Laboratory
- Core Resources
- Consultant
- Alasdair Noble of Metcor Pty Ltd
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-10-20T00:00:00.000Z
Reasoning: High gold recovery of 91.9% for the Lone Sister composite at 45µm grind size is positive, but finer grinding did not improve recovery and led to lower concentrate grade and higher mass pull.
Positive factors
- High Recovery
Negative factors
- Finer grind provided no material improvement in rougher recovery and resulted in lower concentrate gold grades and higher mass pulls
Evidence · table
“91.9%”
Context: 5.8%
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
flotationTwin Hills · goldRecovery: 98.9 %Head Grade: 1.2Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Twin Hills
- Commodity
- gold
- Region
- australia_qld
- Reported Region
- Queensland's Drummond Basin
- Ticker
- GBM
Test Work
- Program Status
- preliminary
- Test Type
- flotation
- Processing Route
- conventional flotation
- Sample
- 309 composite
- Grind P80
- 75 µm
Recovery
- Recovery
- 98.9 %
- Recovery Basis
- to_concentrate
- Head Grade
- 1.2
- Head Grade Unit
- g/t
- Conc. Grade
- 18
- Conc. Grade Unit
- g/t
- Mass Pull
- 8.7 %
Lab
- Laboratory
- Core Resources
- Consultant
- Alasdair Noble of Metcor Pty Ltd
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-10-20T00:00:00.000Z
Reasoning: Exceptional gold recovery of 98.9% at a low mass pull of 8.7% for the 309 composite at 75µm grind size is a very strong initial flotation result.
Positive factors
- High Recovery
- Low mass pull
Evidence · table
“98.9%”
Context: 8.7%
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: 98.9% is at or above the exceptional band (95%)
flotationTwin Hills · goldRecovery: 99 %Head Grade: 1.2Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Twin Hills
- Commodity
- gold
- Region
- australia_qld
- Reported Region
- Queensland's Drummond Basin
- Ticker
- GBM
Test Work
- Program Status
- preliminary
- Test Type
- flotation
- Processing Route
- conventional flotation
- Sample
- 309 composite
- Grind P80
- 45 µm
Recovery
- Recovery
- 99 %
- Recovery Basis
- to_concentrate
- Head Grade
- 1.2
- Head Grade Unit
- g/t
- Conc. Grade
- 16.3
- Conc. Grade Unit
- g/t
- Mass Pull
- 10.6 %
Lab
- Laboratory
- Core Resources
- Consultant
- Alasdair Noble of Metcor Pty Ltd
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-10-20T00:00:00.000Z
Reasoning: Exceptional gold recovery of 99.0% for the 309 composite at 45µm grind size is positive, but finer grinding did not improve recovery and led to lower concentrate grade and higher mass pull.
Positive factors
- High Recovery
Negative factors
- Finer grind provided no material improvement in rougher recovery and resulted in lower concentrate gold grades and higher mass pulls
Evidence · table
“99.0%”
Context: 10.6%
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
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%)
bottle rollTwin Hills · goldRecovery: 87.3 %Head Grade: 1.55Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Twin Hills
- Commodity
- gold
- Region
- australia_qld
- Reported Region
- Queensland's Drummond Basin
- Ticker
- GBM
Test Work
- Program Status
- preliminary
- Test Type
- bottle roll
- Processing Route
- CIL
- Sample
- Lone Sister composite
- Grind P80
- 75 µm
- Leach Time
- 48 hours
Recovery
- Recovery
- 87.3 %
- Recovery Basis
- actual_test
- Head Grade
- 1.55
- Head Grade Unit
- g/t
Lab
- Laboratory
- Core Resources
- Consultant
- Alasdair Noble of Metcor Pty Ltd
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-10-20T00:00:00.000Z
Reasoning: Encouraging gold recovery of 87.3% from CIL bottle roll tests for the Lone Sister composite at 75µm grind size, consistent with historical results.
Positive factors
- Recovery consistent with historical investigations
Evidence · table
“87.3%”
Context: 75µm
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
bottle rollTwin Hills · goldRecovery: 88.8 %Head Grade: 1.55Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Twin Hills
- Commodity
- gold
- Region
- australia_qld
- Reported Region
- Queensland's Drummond Basin
- Ticker
- GBM
Test Work
- Program Status
- preliminary
- Test Type
- bottle roll
- Processing Route
- CIL
- Sample
- Lone Sister composite
- Grind P80
- 45 µm
- Leach Time
- 48 hours
Recovery
- Recovery
- 88.8 %
- Recovery Basis
- actual_test
- Head Grade
- 1.55
- Head Grade Unit
- g/t
Lab
- Laboratory
- Core Resources
- Consultant
- Alasdair Noble of Metcor Pty Ltd
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-10-20T00:00:00.000Z
Reasoning: Encouraging gold recovery of 88.8% from CIL bottle roll tests for the Lone Sister composite at 45µm grind size, consistent with historical results.
Positive factors
- Recovery consistent with historical investigations
Evidence · table
“88.8%”
Context: 45µm
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
bottle rollTwin Hills · goldRecovery: 25.2 %Head Grade: 1.35Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Twin Hills
- Commodity
- gold
- Region
- australia_qld
- Reported Region
- Queensland's Drummond Basin
- Ticker
- GBM
Test Work
- Program Status
- preliminary
- Test Type
- bottle roll
- Processing Route
- CIL
- Sample
- 309 composite
- Grind P80
- 75 µm
- Leach Time
- 48 hours
Recovery
- Recovery
- 25.2 %
- Recovery Basis
- actual_test
- Head Grade
- 1.35
- Head Grade Unit
- g/t
Reagents
- Reagent Notes
- activated carbon was incorporated into the CIL tests to mitigate potential preg-robbing effects
Lab
- Laboratory
- Core Resources
- Consultant
- Alasdair Noble of Metcor Pty Ltd
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-10-20T00:00:00.000Z
Reasoning: Very low gold recovery of 25.2% from CIL bottle roll tests for the 309 composite at 75µm grind size, significantly below historical results, indicating potential issues with sample representivity or mineralogy despite low arsenic.
Positive factors
- Low arsenic content
Negative factors
- Low Recovery
- Lower than historical CIL results
- Variability in gold assays and nugget effects
- Elevated organic and graphitic carbon present
Evidence · table
“25.2%”
Context: 75µm
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
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 25.2% is below the weak band (80%)
bottle rollTwin Hills · goldRecovery: 47.5 %Head Grade: 1.35Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Twin Hills
- Commodity
- gold
- Region
- australia_qld
- Reported Region
- Queensland's Drummond Basin
- Ticker
- GBM
Test Work
- Program Status
- preliminary
- Test Type
- bottle roll
- Processing Route
- CIL
- Sample
- 309 composite
- Grind P80
- 45 µm
- Leach Time
- 48 hours
Recovery
- Recovery
- 47.5 %
- Recovery Basis
- actual_test
- Head Grade
- 1.35
- Head Grade Unit
- g/t
Reagents
- Reagent Notes
- activated carbon was incorporated into the CIL tests to mitigate potential preg-robbing effects
Lab
- Laboratory
- Core Resources
- Consultant
- Alasdair Noble of Metcor Pty Ltd
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-10-20T00:00:00.000Z
Reasoning: Low gold recovery of 47.5% from CIL bottle roll tests for the 309 composite at 45µm grind size, significantly below historical results, indicating potential issues with sample representivity or mineralogy despite low arsenic.
Positive factors
- Low arsenic content
Negative factors
- Low Recovery
- Lower than historical CIL results
- Variability in gold assays and nugget effects
- Elevated organic and graphitic carbon present
Evidence · table
“47.5%”
Context: 45µm
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
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 47.5% is below the weak band (80%)
Fact 9Twin Hills · goldRecovery: 92.62 %Head Grade: 4.93Head Grade Unit: g/tHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Twin Hills
- Commodity
- gold
- Region
- australia_qld
- Reported Region
- Queensland's Drummond Basin
- Ticker
- GBM
Test Work
- Processing Route
- Whole-ore CIL
- Sample
- 309 Master Composite 1
Recovery
- Recovery
- 92.62 %
- Recovery Basis
- actual_test
- Head Grade
- 4.93
- Head Grade Unit
- g/t
Lab
- Laboratory
- AMMTEC
- Consultant
- Alasdair Noble of Metcor Pty Ltd
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 1999-04-01T00:00:00.000Z
Dates
- Event date
- 2026-10-20T00:00:00.000Z
Reasoning: High historical gold recovery of 92.62% from whole-ore CIL for 309 Master Composite 1, providing context for current testwork.
Positive factors
- High Recovery
Negative factors
- Historical data
Evidence · table
“92.62”
Context: 4.93
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
Fact 10Twin Hills · goldRecovery: 89.99 %Head Grade: 3.28Head Grade Unit: g/tHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Twin Hills
- Commodity
- gold
- Region
- australia_qld
- Reported Region
- Queensland's Drummond Basin
- Ticker
- GBM
Test Work
- Processing Route
- Whole-ore CIL
- Sample
- 309 Master Composite 2
Recovery
- Recovery
- 89.99 %
- Recovery Basis
- actual_test
- Head Grade
- 3.28
- Head Grade Unit
- g/t
Lab
- Laboratory
- AMMTEC
- Consultant
- Alasdair Noble of Metcor Pty Ltd
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 1999-04-01T00:00:00.000Z
Dates
- Event date
- 2026-10-20T00:00:00.000Z
Reasoning: High historical gold recovery of 89.99% from whole-ore CIL for 309 Master Composite 2, providing context for current testwork.
Positive factors
- High Recovery
Negative factors
- Historical data
Evidence · table
“89.99”
Context: 3.28
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
Fact 11Twin Hills · goldRecovery: 96.7 %Head Grade: 12.4Head Grade Unit: g/tHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Twin Hills
- Commodity
- gold
- Region
- australia_qld
- Reported Region
- Queensland's Drummond Basin
- Ticker
- GBM
Test Work
- Processing Route
- Gravity + CIL
- Sample
- 309 bulk composite
Recovery
- Recovery
- 96.7 %
- Recovery Basis
- actual_test
- Head Grade
- 12.4
- Head Grade Unit
- g/t
Lab
- Laboratory
- Metcon Laboratories
- Consultant
- Alasdair Noble of Metcor Pty Ltd
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2003-04-01T00:00:00.000Z
Dates
- Event date
- 2026-10-20T00:00:00.000Z
Reasoning: Very high historical gold recovery of 96.7% from Gravity + CIL for 309 bulk composite, demonstrating strong potential for this processing route.
Positive factors
- High Recovery
Negative factors
- Historical data
Evidence · table
“96.7”
Context: 12.4
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%)
Fact 12Twin Hills · goldRecovery: 92.8 %Head Grade: 52.2Head Grade Unit: g/tHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Twin Hills
- Commodity
- gold
- Region
- australia_qld
- Reported Region
- Queensland's Drummond Basin
- Ticker
- GBM
Test Work
- Processing Route
- Gravity + CIL
- Sample
- 309 Area 1
Recovery
- Recovery
- 92.8 %
- Recovery Basis
- actual_test
- Head Grade
- 52.2
- Head Grade Unit
- g/t
Lab
- Laboratory
- Metcon Laboratories
- Consultant
- Alasdair Noble of Metcor Pty Ltd
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2005-02-01T00:00:00.000Z
Dates
- Event date
- 2026-10-20T00:00:00.000Z
Reasoning: High historical gold recovery of 92.8% from Gravity + CIL for 309 Area 1, supporting the potential of this processing route.
Positive factors
- High Recovery
Negative factors
- Historical data
Evidence · table
“92.8”
Context: 52.2
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
Fact 13Twin Hills · goldRecovery: 96.4 %Head Grade: 2.66Head Grade Unit: g/tHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Twin Hills
- Commodity
- gold
- Region
- australia_qld
- Reported Region
- Queensland's Drummond Basin
- Ticker
- GBM
Test Work
- Processing Route
- Gravity + CIL
- Sample
- 309 Area 3
Recovery
- Recovery
- 96.4 %
- Recovery Basis
- actual_test
- Head Grade
- 2.66
- Head Grade Unit
- g/t
Lab
- Laboratory
- Metcon Laboratories
- Consultant
- Alasdair Noble of Metcor Pty Ltd
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2005-02-01T00:00:00.000Z
Dates
- Event date
- 2026-10-20T00:00:00.000Z
Reasoning: Very high historical gold recovery of 96.4% from Gravity + CIL for 309 Area 3, further supporting the potential of this processing route.
Positive factors
- High Recovery
Negative factors
- Historical data
Evidence · table
“96.4”
Context: 2.66
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: 96.4% is at or above the exceptional band (95%)
Fact 14Twin Hills · goldRecovery: 94.3 %Head Grade: 4.09Head Grade Unit: g/tHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Twin Hills
- Commodity
- gold
- Region
- australia_qld
- Reported Region
- Queensland's Drummond Basin
- Ticker
- GBM
Test Work
- Processing Route
- Gravity + CIL
- Sample
- 309 Area 4
Recovery
- Recovery
- 94.3 %
- Recovery Basis
- actual_test
- Head Grade
- 4.09
- Head Grade Unit
- g/t
Lab
- Laboratory
- Metcon Laboratories
- Consultant
- Alasdair Noble of Metcor Pty Ltd
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2005-02-01T00:00:00.000Z
Dates
- Event date
- 2026-10-20T00:00:00.000Z
Reasoning: High historical gold recovery of 94.3% from Gravity + CIL for 309 Area 4, supporting the potential of this processing route.
Positive factors
- High Recovery
Negative factors
- Historical data
Evidence · table
“94.3”
Context: 4.09
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
Fact 15Twin Hills · goldRecovery: 55.7 %Head Grade: 2.46Head Grade Unit: g/tHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Twin Hills
- Commodity
- gold
- Region
- australia_qld
- Reported Region
- Queensland's Drummond Basin
- Ticker
- GBM
Test Work
- Processing Route
- Gravity + CIL
- Sample
- 309 Area 2 (eight composites)
Recovery
- Recovery
- 55.7 %
- Recovery Basis
- actual_test
- Head Grade
- 2.46
- Head Grade Unit
- g/t
Lab
- Laboratory
- Metcon Laboratories
- Consultant
- Alasdair Noble of Metcor Pty Ltd
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2005-06-01T00:00:00.000Z
Dates
- Event date
- 2026-10-20T00:00:00.000Z
Reasoning: Historical gold recovery for 309 Area 2 composites ranged from 55.7% to 98.2%, with the lowest recoveries associated with lower-grade material, indicating significant metallurgical variability.
Negative factors
- Low Recovery
- Historical data
- Significant variability in recovery
Evidence · table
“55.7-98.2”
Context: 2.46-309.35
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
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 55.7% 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.