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Copper Biomining Heap Leach Consortium

Community ID CommunityMech:000019
Ecological State ENGINEERED
Environment mine tailing
ENVO:00000072

An industrial microbial consortium used for commercial copper bioleaching from low-grade sulfide ores in heap leach operations. This acidophilic community oxidizes ferrous iron and reduced sulfur compounds, generating ferric iron (Fe³⁺) and sulfuric acid that solubilize copper from chalcopyrite (CuFeS₂) and other copper sulfide minerals. The consortium demonstrates temporal succession over the 200-300 day leaching cycle, with Acidithiobacillus ferrooxidans dominating early stages (pH >2, low Fe, ~10⁷ copies/ml at 200 days), followed by Leptospirillum ferriphilum and Ferroplasma acidiphilum in aged heaps (pH 1.67-1.83, high Fe³⁺ ~1.9 g/L, ~10⁵ copies/ml at >250 days). Acidithiobacillus thiooxidans maintains constant sulfur oxidation activity (10⁵ copies/ml) throughout the cycle. Sulfobacillus species contribute at low abundance (10³-10⁴ copies/ml) with increased activity in older heaps. The community operates at pH 1.5-2.5, temperatures 20-60°C depending on thermophilic strains, and produces the Fe³⁺ oxidant critical for copper dissolution (reaching 1.86-1.9 g/L Fe³⁺). This biohydrometallurgical process extracts copper from ores uneconomical for conventional smelting, with industrial operations achieving commercial-scale metal recovery through percolation of acidic leach solutions through heaps of crushed ore.

Taxonomy

Taxon Ontology ID Functional Roles Abundance
Acidithiobacillus ferrooxidans NCBITaxon:920
PRIMARY_PRODUCER PRIMARY_DEGRADER
DOMINANT
  • doi:10.1111/j.1751-7915.2009.00112.x - SUPPORT (IN_VIVO)
    "Acidithiobacillus ferrooxidans was the most abundant during the first part of the leaching cycle, while the abundance of Leptospirillum ferriphilum and Ferroplasma acidiphilum increased with age of the heap"
  • doi:10.1111/j.1751-7915.2009.00112.x - PARTIAL (IN_VIVO)
    "Acidithiobacillus ferrooxidans was the most abundant during the first part of the leaching cycle"
Leptospirillum ferriphilum NCBITaxon:178606
PRIMARY_PRODUCER PRIMARY_DEGRADER
DOMINANT
  • doi:10.1111/j.1751-7915.2009.00112.x - SUPPORT (IN_VIVO)
    "Acidithiobacillus ferrooxidans was the most abundant during the first part of the leaching cycle, while the abundance of Leptospirillum ferriphilum and Ferroplasma acidiphilum increased with age of the heap"
  • doi:10.1038/s41598-021-95324-9 - SUPPORT (IN_VIVO)
    "In this study, we demonstrated a functional diffusible signal factor interspecies quorum sensing signaling mechanism in Leptospirillum ferriphilum and Leptospirillum ferrooxidans that produces (Z)-11-methyl-2-dodecenoic acid when grown with pyrite as energy source"
Acidithiobacillus thiooxidans NCBITaxon:930
PRIMARY_DEGRADER
ABUNDANT
  • doi:10.1111/j.1751-7915.2009.00112.x - SUPPORT (IN_VIVO)
    "Acidithiobacillus thiooxidans kept constant throughout the leaching cycle, and Firmicutes group showed a low and a patchy distribution in the heap"
  • PMID:22123759 - SUPPORT (IN_VITRO)
    "Acidithiobacillus thiooxidans is a mesophilic, extremely acidophilic, chemolithoautotrophic gammaproteobacterium that derives energy from the oxidation of sulfur and inorganic sulfur compounds"
Ferroplasma acidiphilum NCBITaxon:74969
PRIMARY_PRODUCER
ABUNDANT
  • doi:10.1111/j.1751-7915.2009.00112.x - SUPPORT (IN_VIVO)
    "Acidithiobacillus ferrooxidans was the most abundant during the first part of the leaching cycle, while the abundance of Leptospirillum ferriphilum and Ferroplasma acidiphilum increased with age of the heap"
Sulfobacillus thermosulfidooxidans NCBITaxon:28034
PRIMARY_DEGRADER SYNTROPHIC_PARTNER
RARE
  • doi:10.1111/j.1751-7915.2009.00112.x - SUPPORT (IN_VIVO)
    "However, the prokaryotic acidophile microarray (PAM) analysis showed active members of Alphaproteobacteria in all samples and of Sulfobacillus genus in older ones"
  • PMID:19104861 - SUPPORT (IN_VITRO)
    "Phylogenetic and physiological characterization revealed that the isolates were closely related to Sulfobacillus thermosulfidooxidans, Acidithiobacillus caldus and Acidimicrobium ferrooxidans"

Ecological Interactions

Ecological interaction network for Copper Biomining Heap Leach Consortium Bipartite graph where circle nodes represent taxa and colored rectangles represent ecological interactions (cross-feeding, mutualism, syntrophy, competition, commensalism).
Taxon
Cross-feeding
Mutualism
Syntrophy
Competition
Commensalism
Niche partitioning
Colonization facilitation
Strain competition
Predation

Ferrous Iron Oxidation in Early Heaps

CROSS_FEEDING

Source Taxon: Acidithiobacillus ferrooxidans

Metabolites: Fe(II) (CHEBI:29033), Fe(III) (CHEBI:29034)

Biological Processes:

Downstream Effects:
→ Copper Sulfide Dissolution

Evidence

  • "Acidithiobacillus thiooxidans kept constant throughout the leaching cycle, and Firmicutes group showed a low and a patchy distribution in the heap"
  • doi:10.3389/fmicb.2022.820052 - SUPPORT (IN_VITRO)
    "Here Acidithiobacillus ferrooxidans , Leptospirillum ferrooxidans , and Sulfobacillus thermosulfidooxidans were selected to perform bioleaching of chalcopyrite waste rock in the presence of the SX reagent (2.5% v/v LIX984N in kerosene)"

Ferrous Iron Oxidation in Aged Heaps

CROSS_FEEDING

Source Taxon: Leptospirillum ferriphilum

Target Taxon: Ferroplasma acidiphilum

Metabolites: Fe(II) (CHEBI:29033), Fe(III) (CHEBI:29034)

Biological Processes:

Downstream Effects:
→ Copper Sulfide Dissolution

Evidence

Sulfur Oxidation to Sulfuric Acid

MUTUALISM

Source Taxon: Acidithiobacillus thiooxidans

Metabolites: sulfur (CHEBI:26833), sulfuric acid (CHEBI:26836)

Biological Processes:

Evidence

  • "Acidithiobacillus thiooxidans kept constant throughout the leaching cycle, and Firmicutes group showed a low and a patchy distribution in the heap"
  • doi:10.3389/fmicb.2022.820052 - SUPPORT (IN_VITRO)
    "thermosulfidooxidans preferred to oxidize reduced inorganic sulfur compounds."

Copper Sulfide Dissolution

MUTUALISM

Source Taxon: Acidithiobacillus ferrooxidans

Target Taxon: Leptospirillum ferriphilum

Metabolites: chalcopyrite (CHEBI:50885), copper(2+) (CHEBI:29036), Fe(III) (CHEBI:29034), Fe(II) (CHEBI:29033)

Biological Processes:

Downstream Effects:
→ Ferrous Iron Oxidation in Early Heaps

Evidence

  • doi:10.3389/fmicb.2022.820052 - SUPPORT (IN_VIVO)
    "Heap bioleaching, the solubilization of metal ions from metal sulfides by microbial oxidation, is often combined with solvent extraction (SX) and electrowinning to recover, e.g., copper from low-grade ores"

Thermophilic Iron and Sulfur Oxidation

SYNTROPHY

Source Taxon: Sulfobacillus thermosulfidooxidans

Metabolites: Fe(II) (CHEBI:29033), Fe(III) (CHEBI:29034), sulfur (CHEBI:26833)

Biological Processes:

Evidence

  • "Acidithiobacillus thiooxidans kept constant throughout the leaching cycle, and Firmicutes group showed a low and a patchy distribution in the heap"

Environmental Factors

Factor Value Unit
pH Gradient Across Heap Age 1.67-2.5 pH units
  • doi:10.1111/j.1751-7915.2009.00112.x - SUPPORT (IN_VIVO)
    "The results suggest that changes during the leaching cycle in chemical and physical conditions, such as pH and Fe 3+ /Fe 2+ ion rate, are primary factors shaping the microbial dynamic in the heap."
  • doi:10.1111/j.1751-7915.2009.00112.x - PARTIAL (IN_VIVO)
    "understanding the microbial dynamic is key to advancing commercial bioleaching operations"
Temperature Range 20-60 °C
  • doi:10.3389/fmicb.2018.03059 - SUPPORT (IN_VITRO)
    "In this study, we report that microbial iron oxidation by Sulfobacillus thermosulfidooxidans meets these specifications"
Ferric Iron Concentration 1.86-1.9 g/L
  • doi:10.1111/j.1751-7915.2009.00112.x - SUPPORT (IN_VIVO)
    "Acidithiobacillus thiooxidans kept constant throughout the leaching cycle, and Firmicutes group showed a low and a patchy distribution in the heap"
Heap Age and Succession 0-300 days
  • doi:10.1111/j.1751-7915.2009.00112.x - SUPPORT (IN_VIVO)
    "Acidithiobacillus thiooxidans kept constant throughout the leaching cycle, and Firmicutes group showed a low and a patchy distribution in the heap"
Oxygen Availability Aerobic with microaerobic zones qualitative
  • doi:10.1111/j.1751-7915.2009.00112.x - SUPPORT (IN_VIVO)
    "Acidithiobacillus thiooxidans kept constant throughout the leaching cycle, and Firmicutes group showed a low and a patchy distribution in the heap"

Growth Media

Standard 9K Medium (laboratory cultivation of consortium members) (CultureMech:003277)

View in CultureMech →

pH 2.0
Temperature 30 °C
Atmosphere AEROBIC

Composition

Component Concentration Unit CHEBI
Ammonium sulfate 3.0 g/L CHEBI:62946
Dipotassium hydrogen phosphate 0.5 g/L CHEBI:131527
Magnesium sulfate heptahydrate 0.5 g/L CHEBI:32599
Potassium chloride 0.1 g/L CHEBI:32588
Calcium nitrate 0.01 g/L CHEBI:64205
Iron(II) sulfate heptahydrate 44.22 g/L CHEBI:31437
Elemental sulfur 10 g/L CHEBI:27568
K2HPO4 0.499501 G_PER_L N/A
(NH4)2SO4 2.997 G_PER_L N/A
KCl 0.0999001 G_PER_L N/A
MgSO4 x 7 H2O 0.499501 G_PER_L N/A
FeSO4 x 7 H2O 49.9501 G_PER_L N/A
Ca(NO3)2 0.00999001 G_PER_L N/A
H2SO4 1 G_PER_L N/A

Preparation notes: Classic 9K medium (Silverman & Lundgren 1959) used for laboratory cultivation of individual consortium members. pH adjusted with H2SO4. For iron oxidizers (At. ferrooxidans, Leptospirillum spp.), use FeSO4 as energy source. For sulfur oxidizers (At. thiooxidans), elemental sulfur S0 is primary substrate. Temperature varies by organism: mesophiles (At. ferrooxidans, At. thiooxidans) at 28-30°C, moderate thermophiles (Sulfobacillus spp.) at 45-55°C. Modifications: For Leptospirillum (obligate autotroph), omit yeast extract. For Ferroplasma (mixotroph), add 0.02-0.1% yeast extract. For Sulfobacillus (facultative autotroph), add 0.02% yeast extract. For nitrogen fixation studies with L. ferrodiazotrophum, omit (NH4)2SO4. Industrial heap operations use in situ bioleaching rather than defined media - ore heaps are irrigated with acidic process solution containing indigenous microorganisms.

Evidence

doi:10.1111/j.1751-7915.2009.00112.x

"understanding the microbial dynamic is key to advancing commercial bioleaching operations"

doi:10.3389/fmicb.2022.820052

"Here Acidithiobacillus ferrooxidans , Leptospirillum ferrooxidans , and Sulfobacillus thermosulfidooxidans were selected to perform bioleaching of chalcopyrite waste rock in the presence of the SX reagent (2.5% v/v LIX984N in kerosene)"