Isolation and characterization of native strains from lithium-containing mining tailings.

Area of Science:

• Microbiology
• Environmental Science
• Biotechnology

Background:

• Lithium mining tailings represent extreme environments.
• These habitats can harbor microorganisms with unique biotechnological capabilities.
• Exploration of microbial life in such niches is crucial for discovering novel bio-resources.

Purpose of the Study:

• To isolate and molecularly characterize native microorganisms from lithium-rich mining tailings.
• To assess the lithium tolerance of these microbial isolates.
• To explore the potential of these microorganisms for biohydrometallurgy.

Main Methods:

• Isolation of pure microbial cultures using serial dilution and cross-streaking.
• Determination of lithium tolerance via minimum inhibitory concentration (MIC) assays.
• Molecular identification through DNA extraction, amplification, sequencing, and phylogenetic analysis.

Main Results:

• Six pure cultures were successfully isolated from the Nochebuena mine tailings.
• Isolates demonstrated significant lithium tolerance, with minimum inhibitory concentrations ranging from 5,000 to 20,000 ppm LiCl.
• Identified species include Stutzerimonas chloritidismutans, Microbacterium paraoxydans, Stenotrophomonas maltophilia, Bacillus cereus, and Bacillus ludwigii.

Conclusions:

• Lithium-rich mining tailings harbor diverse microbial communities with high lithium tolerance.
• These extremophilic microorganisms represent a promising resource for biohydrometallurgical applications.
• Further research into these microbes could lead to innovative biotechnological solutions.