Back in 2010 we at BiotaTec performed trial bioleaching tests with Graptolite Argillite.   

Due to fascinating results we carried out further investigation that resulted a vision of a combined method for degradation of organic geopolymers and bioleaching of metals from given Estonian black shale.  In given approach, specially developed consortia of microorganisms produce methane gas in anaerobic phase at neutral pH while simultaneously freeing metals through degradation of organic complexes. We named the technology BiotaMet. 
5 years long research resulted with patent application in 2016.

The approach of BiotaTec can be adapted for any organics and metallic complexes  containing ore / mining waste that are considered not valuable for processing with less profitable traditional technologies or common bioleaching at acidic conditions. Through generation of methane gas as energy the whole process would be more cost-efficient, by breaking up the organic complexes more valuable metals would be extracted and the solid waste of would be more environmentally friendly. 

New bioleaching tests with our team of Hungry Miners have started with samples of other shales and waste electronic equipment.

Was that interesting?  Please send as an e-mail with Your thoughts and we will be excited to perform preliminary tests with Your raw material. For such or any other type of co-operation please contact us via sirli(at)