Sustainable Solutions

Bioleaching of Rare Earth Elements

DHT designs bioleaching studies for rare earth element recovery from tailings, waste rock, and processing residues. We evaluate mineral deportment, microbial pathways, leach kinetics, solution chemistry, acid generation, and residue stability. Our programs support resource recovery while controlling downstream water quality, treatment requirements, and closure geochemical risks effectively responsibly today. 

Waste Water CO2 Removal 

DHT evaluates mine wastewater, brines, alkaline process streams, and treatment residuals for carbon mineralization potential. We assess carbonate precipitation, alkalinity balance, scaling risk, trace-metal mobility, PHREEQC reaction pathways, and monitoring requirements to support durable CO₂ storage, water treatment co-benefits, and closure-compatible climate solutions for mining operations. 

Geologic Hydrogen 

DHT supports early-stage geological hydrogen screening through assessment of mafic, ultramafic, iron-rich, and radiolytic geological settings. We evaluate rock-water reactions, serpentinization potential, redox gradients, fluid pathways, groundwater chemistry, gas migration risks, and monitoring concepts to help clients identify technically defensible hydrogen exploration opportunities and environmental safeguards. 

Enhanced Rock weathering - CCS 

DHT assesses enhanced rock weathering opportunities using basaltic, mafic, ultramafic, and alkaline materials. We evaluate mineral reactivity, carbon dioxide uptake, trace-metal release, soil-water chemistry, weathering kinetics, and monitoring requirements. Our work supports responsible deployment where carbon removal, land application, and environmental safeguards must be demonstrated together clearly transparently today responsibly. 

Critical Minerals Geochemical Screening 

DHT screens mine waste and geological materials for lithium, cobalt, nickel, manganese, graphite, niobium, tantalum, gallium, germanium, tellurium, scandium, and rare earth elements. We combine assay review, mineralogical interpretation, leaching behaviour, ARD/ML assessment, and water quality implications to identify technically credible critical-mineral opportunities for investment and circular-economy planning responsibly now. 

Mineral Extraction Optimization  

DHT supports mineral extraction optimization by linking ore mineralogy, hydrogeochemistry, leach chemistry, process-water recycling, reagent interactions, and residue stability. We help clients improve recovery, reduce reagent demand, manage scaling or precipitation, and anticipate water quality risks that may affect operations, permitting, tailings management, and closure performance objectives. and cost control. 

Critical Minerals from Legacy Sites  

DHT assesses abandoned and legacy mine sites for critical-mineral recovery, environmental remediation, and water quality improvement opportunities. We evaluate mine waste inventories, REE or battery-metal potential, ARD/ML risk, seepage quality, treatment needs, land constraints, and regulatory pathways to support redevelopment that reduces liability and improves stewardship outcomes. and community benefit.  

Carbon-Sequestration Test Programs 

DHT designs laboratory and field test programs to quantify mine waste carbonation rates, CO2 uptake, alkalinity consumption, mineral transformation, and trace-metal response. We develop sampling plans, kinetic protocols, monitoring metrics, and scale-up criteria that support carbon removal claims while protecting water quality and closure performance across mine sites and residues.