Metalliferous black shale primary resource
Metal-bearing, organic-matter-containing sedimentary shale considered as a geological resource. This heterogeneous rock is distinct from its constituent elements, individual mineral species, a standardized traded concentrate and processing-generated waste. The cited Pakistani, Polish and incompletely localized experimental feeds are not interchangeable. The Polish neutral-stage experiment used a previously acid-bioleached and washed derivative of the ore; its remaining-metal denominator is not the original geological feed inventory. No constituent's criticality designation or industrial recovery performance is inherited by this resource family.
Microbial & Biochemical Mechanisms (3)
Conditional acidophile-associated leaching with copper null results
bioleaching
Microbial
Associated Organisms:
Acidithiobacillus ferrooxidans (NCBITaxon:920)
Source-labelled Acidithiobacillus ferrooxidans Heap-1 cultures were associated with changed iron and manganese concentrations during acidic treatment of M-921 shale. The day-20 comparison does not show a copper advantage over abiotic treatment, and manganese enhancement depends on initial pH. These are solution observations, not isolated-metal yields or proof of a particular mineral-dissolution pathway.
Experimental Context & Analytical Limits:
Anjum et al. obtained ore from PIEAS, originally from the source-spelled Turbella area, Pakistan. Oven-dried, ground material of source-reported particle size at or below 200 mesh was tested at 1% w/v in 250-mL shake flasks, 30 degrees C and 100 rpm, with uninoculated chemical controls. Table 3 compares initial pH 1.5, 2.0 and 2.5 with and without added ferrous iron; some media used 160 mM ferrous sulfate, but assignment of that dose to every endpoint arm is not explicit. Samples were centrifuged and filtered before metal analysis by atomic absorption; iron-speciation time courses used phenanthroline. Heap-1 is the ore assay culture, distinct from the three-strain growth comparison. The species identifier does not authenticate this local isolate. Leaching-flask replication, detection limits and a closed metal balance are not reported. Final pH and iron chemistry differ between arms.
Anjum et al. obtained ore from PIEAS, originally from the source-spelled Turbella area, Pakistan. Oven-dried, ground material of source-reported particle size at or below 200 mesh was tested at 1% w/v in 250-mL shake flasks, 30 degrees C and 100 rpm, with uninoculated chemical controls. Table 3 compares initial pH 1.5, 2.0 and 2.5 with and without added ferrous iron; some media used 160 mM ferrous sulfate, but assignment of that dose to every endpoint arm is not explicit. Samples were centrifuged and filtered before metal analysis by atomic absorption; iron-speciation time courses used phenanthroline. Heap-1 is the ore assay culture, distinct from the three-strain growth comparison. The species identifier does not authenticate this local isolate. Leaching-flask replication, detection limits and a closed metal balance are not reported. Final pH and iron chemistry differ between arms.
Curated Evidence Points:
Support
Source:
anjum_2009
Table 3, day 20: iron-supplemented manganese concentrations at initial pH 2.0 were 25.3 mg/dm3 inoculated versus 19.5 in the control; at pH 1.5 they were 26.8 versus 24.0. In the medium without added iron, the pH-1.5 pair reported 103.00 versus 74.25 mg/dm3 iron. These observations support conditional culture-associated changes; neither matched acidity nor exclusive microbial causation follows.
Partial
Source:
anjum_2009
The same table reports 1.75 mg/dm3 copper in every iron-supplemented culture and control, and less manganese in the pH-2.5 culture (15.8 versus 17.85 mg/dm3). Thus the broad concluding improvement claim is not supported for copper or all manganese conditions. Unsupplemented non-iron cells marked ND cannot be treated as zero: p5262 says only iron was analyzed in that medium. Added medium iron prevents assigning all dissolved iron to the ore. Table 1 reports acid-digest concentrations in mg/L, not solid mg/kg; it is not used as an extraction denominator. Jarosite and gypsum are reported in both biotic and abiotic residues, not as uniquely microbial products.
Neutral-stage culture-associated leaching of acid-pretreated shale
bioleaching
Microbial
A source-identified Bacillus mixture was associated with additional copper and nickel release from previously acid-bioleached Lubin shale at near-neutral pH. Chemical differences between culture and thymol controls prevent isolating the biological contribution. The proposed cleavage of organometallic bonds is an interpretation, not directly demonstrated molecular chemistry.
Experimental Context & Analytical Limits:
Farbiszewska-Kiczma et al. extensively water-washed the acid-preleached ore before this second stage. Prepared feed contained 1.58% Cu, 0.67% Pb, 0.27% Zn and 0.006% Ni. The source identified B. cereus B.c.-04 and B. amyloliquefaciens B.a.-04 using phenotype-based methods; no sequence or collection accession authenticates either strain here. The 1:1 mixture was tested in a 24-day, 25-degrees-C aerated reactor at 300 rpm using 400 g feed, 3400 mL mineral medium and 600 mL inoculated broth. pH was brought near 7 with 10% NaOH. Controls used 400 g feed, 4000 mL mineral medium and 20 g thymol, without matched uninoculated broth. Copper and nickel were measured by atomic absorption. Companion 28-day flasks at 10, 20 and 40 degrees C had pH checked twice daily and adjusted near 7. Replicate experiments and analytical uncertainty are not specified; three temperatures are not three replicates.
Farbiszewska-Kiczma et al. extensively water-washed the acid-preleached ore before this second stage. Prepared feed contained 1.58% Cu, 0.67% Pb, 0.27% Zn and 0.006% Ni. The source identified B. cereus B.c.-04 and B. amyloliquefaciens B.a.-04 using phenotype-based methods; no sequence or collection accession authenticates either strain here. The 1:1 mixture was tested in a 24-day, 25-degrees-C aerated reactor at 300 rpm using 400 g feed, 3400 mL mineral medium and 600 mL inoculated broth. pH was brought near 7 with 10% NaOH. Controls used 400 g feed, 4000 mL mineral medium and 20 g thymol, without matched uninoculated broth. Copper and nickel were measured by atomic absorption. Companion 28-day flasks at 10, 20 and 40 degrees C had pH checked twice daily and adjusted near 7. Replicate experiments and analytical uncertainty are not specified; three temperatures are not three replicates.
Curated Evidence Points:
Support
Source:
farbiszewska_2004
Reactor methods pp275-276, Figure 4 and Table 1: reported extraction percentages were 2.5% Cu and 9.3% Ni in the culture treatment, versus 0.15% and 0.22% in the thymol comparison. These concern metals remaining in pretreated feed, not overall recovery from raw shale; no isolated metal product or industrial deployment is shown. Flask Figure 3 also retains very low zinc concentrations with nonzero control release, rather than universal efficient leaching.
Partial
Source:
farbiszewska_2004
Flask methods print a solid-to-liquid ratio of 5:1, inconsistent with interpreting the published concentration/percentage pairs using that literal loading; no corrected ratio is asserted. Figure 1's temperature legend conflicts with the prose: the highest final copper curve is labelled 10, whereas p277 assigns 90 mg/dm3 to 40 degrees C. No temperature optimum is curated. Thymol effects and the unmatched reactor broth remain confounders. Leaching kinetics and phenotypic identification alone do not prove particular metal-organic bonds, enzyme action or strain identity.
Substrate-dependent extraction estimates during mixed-culture leaching
bioleaching
Microbial
The adapted WZ-Q microbial community was used in laboratory assays of vanadium-, nickel- and molybdenum-bearing shale. Added ferrous substrate increased the reported molybdenum extraction estimate while lowering vanadium and nickel estimates relative to the inoculated unamended arm. Pyrite gave lower estimates for all three metals. The comparison does not establish a microbial advantage over chemical leaching.
Experimental Context & Analytical Limits:
Lu et al. used the mixed WZ-Q community, derived by ore and molybdenum adaptation of WZ-Y and described at genus level as dominated by Leptospirillum and Acidithiobacillus. No member-specific causal role or authenticated strain is assigned. Black-shale origin and particle size are unspecified in the inspected methods. Conditions were 10% w/v solids, 10% v/v inoculum, 0K salts medium, 30 degrees C, initial pH 1.4 and 150 rpm, with trajectories shown through day 30. Triplicate experiments are reported per condition. WZ-1 had no additive, WZ-2 ferrous sulfate, WZ-3 elemental sulfur at 1 g/L, and WZ-4 pyrite at 1 g/L. Table 3 prints Fe2+ at 44.6 g/L, whereas the culture-medium recipe specifies FeSO4.7H2O at 44.6 g/L; the ferrous-dose basis remains unresolved. WZ-1 is inoculated, and no abiotic black-shale comparator is reported. Separate molybdenite-concentrate assays are not this feed.
Lu et al. used the mixed WZ-Q community, derived by ore and molybdenum adaptation of WZ-Y and described at genus level as dominated by Leptospirillum and Acidithiobacillus. No member-specific causal role or authenticated strain is assigned. Black-shale origin and particle size are unspecified in the inspected methods. Conditions were 10% w/v solids, 10% v/v inoculum, 0K salts medium, 30 degrees C, initial pH 1.4 and 150 rpm, with trajectories shown through day 30. Triplicate experiments are reported per condition. WZ-1 had no additive, WZ-2 ferrous sulfate, WZ-3 elemental sulfur at 1 g/L, and WZ-4 pyrite at 1 g/L. Table 3 prints Fe2+ at 44.6 g/L, whereas the culture-medium recipe specifies FeSO4.7H2O at 44.6 g/L; the ferrous-dose basis remains unresolved. WZ-1 is inoculated, and no abiotic black-shale comparator is reported. Separate molybdenite-concentrate assays are not this feed.
Curated Evidence Points:
Support
Source:
lu_2026
Sections 2.3-2.4 and 4.1, Table 3 and Figures 5-7: source-annotated extraction values for WZ-1/WZ-2/WZ-3/WZ-4 are 66.0/59.5/66.5/65.3% V, 82.4/80.6/82.5/80.8% Ni and 9.7/29.7/12.9/7.7% Mo. Methods describe ICP-OES analysis of digested post-leach residues, without an explicit extraction equation or complete residual-mass balance. These are reported extraction estimates, not independently verified dissolved inventories or recovered-product yields.
Partial
Source:
lu_2026
Figures 5-7 include error bars without defining their statistical meaning; some axes run from 0 to 1 while labelled percent. The curated values follow the explicit percentage annotations, not a reconstructed axis conversion. The small sulfur-arm differences from WZ-1 (0.5 percentage points V and 0.1 Ni) do not establish statistically demonstrated enhancement. Acid/redox differences, missing abiotic arms and the uncertain iron dose constrain causal attribution. Community annotations and operational chemical fractionation do not prove a taxon-specific pathway or uniquely identify each host phase; no industrial demonstration is reported.
Sources & References
-
anjum_2009: Anjum F, Bhatti HN and Ambreen A. Bioleaching of Black Shale by Acidithiobacillus ferrooxidans. Asian Journal of Chemistry 21(7):5251-5266, printed 2009; publisher landing metadata lists 2010. Primary PDF, especially pp5252-5253, 5257, 5262 and Table 3 on p5264. No DOI verified.
https://asianpubs.org/index.php/ajchem/article/view/18301/18250 (accessed 2026-10-11) -
farbiszewska_2004: Farbiszewska-Kiczma J, Farbiszewska T and Bak M (2004). Bioleaching of metals from Polish black shale in neutral medium. Physicochemical Problems of Mineral Processing 38:273-280, as printed; publisher landing metadata starts at 272. Primary methods pp274-276, Figures 1-4 and Table 1.
https://www.journalssystem.com/ppmp/pdf-79493-15545?filename=Bioleaching-of-metals-fro.pdf (accessed 2026-10-11) -
lu_2026: Lu Y, Wen J, Mo X, Yang X, Shang H, Liu X, Sun J and Yang H (2026). Influence and Mechanism of Vanadium, Nickel, and Molybdenum Bioleaching from Black Shale by Energy Substrates. Minerals 16(2):197. doi:10.3390/min16020197; published 13 February 2026.
https://doi.org/10.3390/min16020197 (accessed 2026-10-11) -
ncbi_ferrooxidans: NCBI Taxonomy 920 — Acidithiobacillus ferrooxidans, species rank
https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?id=920&mode=Info (accessed 2026-10-11)
Curation History
| Timestamp | Curator | Action | Summary |
|---|---|---|---|
2026-10-11T17:00:16Z |
Codex (GPT-6; codex) | record_creation | Created one geological resource record with three separately scoped primary-study comparisons. Preserved null and below-control outcomes, pretreated-feed denominators, figure and dose conflicts, culture-identity limits and incomplete mass balances. Independent scientific review is recorded separately from this curation event. |
Record source: data/records/metalliferous-black-shale.yaml