Endomines Finland has moved Sofi Filtration’s Sofi Alchemist technology into full-scale production at the Pampalo gold mine in eastern Finland, targeting recovery of ultra-fine gold particles from processing streams that can be difficult to capture through conventional recovery systems.
The deployment follows a successful pilot programme completed in the previous year, during which the filtration technology achieved recovery rates of up to 99% for fine concentrate from process filtrate. The industrial installation at Pampalo represents an effort to increase gold recovery from existing processing operations by capturing valuable material from side streams within the mine’s water circulation system.
Pampalo deployment targets additional gold recovery from process streams
The Pampalo mine in Ilomantsi, eastern Finland, is the centre of Endomines’ Finnish gold production operations and forms part of the company’s broader activities along the Karelian Gold Line, where exploration continues.
The Sofi Alchemist system is designed to recover ultra-fine gold particles from mill water circulation streams, material that may otherwise pass through conventional recovery circuits and leave the processing system with process water. By improving capture of fine gold concentrate, the technology aims to reduce mineral losses while increasing recovered output without requiring a major expansion of existing processing infrastructure. The installation reflects a broader industry focus on improving recovery efficiency from operating mines, particularly as producers seek additional value from existing assets.
Water treatment technology supports mineral processing efficiency
Sofi Alchemist is designed not only as a gold recovery system but also as a process water purification solution. The technology allows recovered material to be removed from circulating water streams while improving water quality for reuse within the processing plant.
This approach supports efforts by mining companies to reduce freshwater consumption, improve process-water management and strengthen resource efficiency. For modern mining operations, improvements in recovery rates can have a significant impact on economics because additional metal production can be generated from existing ore throughput rather than through new mining capacity.
Full-scale operation follows successful pilot testing
Endomines moved forward with commercial deployment after the pilot phase demonstrated the technology’s ability to recover fine concentrate from process filtrate. The transition from pilot testing to continuous plant operation is a critical stage for mining technologies, as operating conditions can differ significantly from laboratory or trial environments.
The Pampalo installation allows Endomines to collect operational data on recovery performance, system integration, maintenance requirements and long-term economic results. The company has highlighted the importance of improving recovery efficiency while maintaining uninterrupted production at the mine.
Service-based model reduces technology adoption barriers
Sofi Filtration is providing the technology through a Recovery as a Service model, under which the technology provider owns and operates the system at the mine site.
The model allows mining companies to access recovery technology without making the full upfront capital investment typically associated with new processing equipment. For small and mid-sized mining operators, service-based arrangements can reduce financial exposure and transfer part of the technical responsibility to specialised technology providers.
The approach combines equipment, operational expertise and performance management while allowing mine operators to allocate capital toward activities such as exploration, mine development, safety improvements and core processing upgrades.
Recovery optimisation gains importance in European mining
The Pampalo project reflects a broader shift in the mining sector toward improving performance through process optimisation rather than relying only on larger mines, increased throughput or major expansion projects.
Technologies focused on fine-particle recovery, advanced filtration, water treatment, automation and process control are increasingly being considered as tools to improve the economics of existing operations.
This trend is particularly relevant in Europe, where new mining developments often face lengthy permitting processes and increased environmental scrutiny. Improving recovery from operating mines can support domestic mineral production by increasing output from existing facilities while reducing additional land and infrastructure requirements.
Technology applications extend beyond gold
The challenge of recovering fine particles is not limited to gold operations. Mineral-processing circuits for commodities including copper, nickel, lithium, rare earths, graphite and polymetallic deposits also face difficulties recovering valuable materials contained in smaller particle sizes.
Technologies capable of extracting economically valuable material from process water or other side streams could therefore have applications across multiple mineral sectors. The Pampalo deployment provides an example of how improvements in processing efficiency can contribute to broader resource utilisation strategies.
Finland strengthens mining technology and processing position
The project also highlights Finland’s role in developing mining-related technologies, including mineral processing, water treatment, automation and environmental engineering solutions.
Sofi Filtration’s technology being applied at a Finnish gold operation creates a connection between domestic engineering expertise and local mining production. The deployment supports Finland’s focus on resource-efficient mining practices and the development of technologies aimed at improving operational performance.
Full-scale results will determine economic impact
While the pilot phase achieved recovery rates of up to 99% for fine concentrate from process filtrate, the long-term commercial impact will depend on performance during continuous operation. Key factors include recovered gold volumes, operating costs, system availability, maintenance requirements, improvements in water quality, integration with the processing plant and the commercial structure between Endomines and Sofi Filtration.
The Pampalo installation provides a reference point for evaluating whether fine-particle recovery technology can deliver consistent economic benefits at operating mines. The deployment positions the mine as a test site for a broader approach to mineral processing, where improved recovery from existing process streams becomes part of efforts to increase production efficiency and reduce material losses.
