Tailings Dewatering: Methods, Benefits and Phibion’s AMC Technology

Understanding the Tailings Dewatering Process: Methods, Benefits and Advanced Technology

Mining operations generate substantial volumes of tailings—the residual materials left after valuable minerals have been extracted from ore. Managing these materials safely, efficiently and sustainably is one of the mining industry's most important challenges.

The tailings dewatering process reduces tailings water content to improve water recovery, material performance, and tailings storage management. The right approach can help mining companies reduce operating costs, manage risks and make better use of existing storage capacity.

However, not all dewatering technologies work in the same way. From conventional filtration to advanced in-situ consolidation, selecting the right solution depends on tailings characteristics, site conditions, operational objectives and long-term storage requirements.

Phibion's proprietary Accelerated Mechanical Consolidation (AMC™) process and MudMaster® technology offer a distinctive approach: mechanically consolidating tailings directly within existing tailings storage facilities rather than relying solely on conventional separation equipment.

What Is Tailings Dewatering?

Tailings dewatering is the process of reducing the water contained in mine tailings following mineral processing.

Tailings are commonly transported as a slurry, consisting of fine mineral particles suspended in water. Depending on the ore, processing method and particle characteristics, this slurry can retain significant amounts of water and require careful management within a tailings storage facility (TSF).

Effective tailings dewatering can help mining operators:

• Recover water for reuse in processing operations.

• Improve tailings consolidation and material strength.

• Reduce reliance on additional tailings storage capacity.

• Improve operational efficiency and manage costs.

• Support more effective tailings risk management.

• Reduce the environmental footprint associated with tailings storage.

  
  

The objective is not simply to remove as much water as possible. It is to achieve the right combination of water recovery, tailings performance, operational reliability and whole-of-life cost for the specific mine.

How Does the Tailings Dewatering Process Work?

Tailings dewatering can involve several processes, depending on the technology selected and the required outcome.

1. Thickening

Thickeners use gravity settling, often assisted by flocculants, to separate water from suspended solids. The recovered water can be returned to the processing circuit, while the thickened tailings retain enough moisture to transport and deposit.

Thickening is widely used as an initial water-recovery step, but it does not necessarily deliver the final consolidation or strength required for long-term tailings management.

2. Filtration

Filtration technologies, including filter presses and vacuum filters, separate water from tailings using pressure or vacuum. The resulting filter cake generally contains substantially less water than conventional slurry tailings.

Filtered tailings may be transported and placed in a dry-stack configuration, subject to appropriate engineering design and site conditions.

Filtration can deliver high levels of water recovery, but capital investment, energy consumption, filtration capacity, maintenance requirements and the characteristics of fine tailings must be considered.

3. Centrifugation

Centrifuges use rotational forces to separate solids and liquids. Their suitability depends on tailings properties, throughput requirements, energy consumption and maintenance considerations.

As with other mechanical separation methods, the economics and performance of centrifugation need to be evaluated for the specific application.

4. In-situ Tailings Dewatering and Consolidation

An alternative to removing water primarily through surface processing equipment is to improve the consolidation of tailings directly within the existing storage facility.

Phibion's Accelerated Mechanical Consolidation (AMC) process uses MudMaster technology to mechanically work tailings in situ, promoting consolidation and increasing tailings strength.

Rather than relying exclusively on filtration or other separation equipment, AMC focuses on improving the performance of tailings where they are stored. This approach can help mining operators recover water, improve storage utilisation and reduce the need for additional infrastructure, depending on site conditions.

Phibion's AMC Technology: A Different Approach to Tailings Dewatering

Phibion specialises in tailings optimisation, dewatering and risk reduction for the global resources industry.

Its proprietary Accelerated Mechanical Consolidation (AMC) process is delivered using MudMaster technology, which operates directly within tailings storage facilities.

AMC is designed to accelerate the consolidation of tailings, improving their strength and enabling more effective use of existing storage capacity. The process can also support water recovery and ongoing monitoring of tailings performance.

Key benefits include:

• Improved tailings consolidation: AMC mechanically works tailings in situ to accelerate consolidation and improve material strength.

• Water recovery: As tailings consolidate, water can be released and recovered, supporting more efficient water management.

• Better utilisation of existing storage: Improving consolidation can help increase the effective capacity of existing tailings storage facilities and potentially defer costly storage expansion.

• Reduced infrastructure requirements: Because AMC works within existing facilities, it can provide an alternative to approaches that depend on significant new processing or storage infrastructure.

• Operational insights: Phibion's monitoring and reporting capabilities help operators track performance and inform operational decisions.

AMC is not a universal replacement for filtration, thickening or other dewatering technologies. Each mine requires an assessment of its tailings properties, water balance, storage design, operating conditions and performance objectives. In suitable applications, AMC provides a distinctive option for improving tailings performance without relying solely on conventional dewatering infrastructure.

Comparing Tailings Dewatering Methods

Different technologies address different operational requirements. The most appropriate solution depends on the desired water recovery, tailings strength, site conditions and total cost of ownership.

Technology	Primary function	Key consideration
Thickening	Separates water from slurry through settling	Often requires further treatment or consolidation
Filtration	Mechanically separates water from solids	Capital, energy, maintenance and filter-cake handling
Centrifugation	Separates solids and liquids using rotational force	Tailings properties, throughput and operating costs
Passive drainage	Allows water to drain or evaporate naturally	Performance depends on time, climate and material characteristics
Phibion AMC	Mechanically consolidates tailings in situ	Suitability depends on tailings properties and facility conditions

These technologies are not necessarily mutually exclusive. Some operations may benefit from combining water recovery at the processing plant with further consolidation within the tailings storage facility.

The right comparison should consider the entire operating system, including capital expenditure, operating expenditure, water recovery, storage capacity, maintenance, risk and closure requirements.

Why Tailings Dewatering Matters for Mining Sustainability

Water recovery and reuse

Water is a critical resource for mineral processing, and many mines operate in water-stressed regions. Recovering and reusing water from tailings can reduce freshwater demand and improve operational resilience.

Tailings storage capacity

Tailings consolidation can improve the use of available storage capacity. Where supported by site-specific engineering assessments, this may reduce or defer the need for additional storage infrastructure.

Risk management

Tailings performance, drainage, strength and pore-water pressures are important considerations in the safe management of tailings storage facilities. Dewatering and consolidation can contribute to risk management, but they must form part of a comprehensive approach that includes engineering design, monitoring, governance and ongoing facility management.

Economic performance

The cost of tailings management extends beyond the initial equipment investment. Water management, storage expansion, maintenance, energy consumption, operational downtime and closure liabilities all contribute to whole-of-life costs.

Selecting an appropriate dewatering and consolidation strategy can help mining companies balance these costs while improving environmental and operational outcomes.

Choosing the Right Tailings Dewatering Solution

Before selecting a technology, mining operators should evaluate several factors:

• Tailings characteristics: Particle size, mineralogy, plasticity and consolidation behaviour.

• Water management objectives: Required water recovery, water quality and opportunities for reuse.

• Storage conditions: Existing TSF design, available capacity, drainage and geotechnical requirements.

• Operating costs: Capital investment, energy, labour, maintenance and consumables.

• Long-term performance: Consolidation, strength development, monitoring and closure objectives.

• Site-specific suitability: Whether the proposed technology can deliver the required outcomes under actual operating conditions.

A technology that performs well in one operation may not be the best solution for another. Technical assessment and site-specific performance data are essential to selecting the right approach.

Advancing Tailings Optimisation with Phibion

As mining companies face increasing pressure to improve water efficiency, manage tailings risks and optimise existing infrastructure, tailings dewatering is becoming an increasingly important part of modern mine planning.

Phibion's Accelerated Mechanical Consolidation process and MudMaster® technology provide an alternative approach to tailings management by focusing on in-situ consolidation, water recovery and storage optimisation.

With 19 MudMaster machines deployed across six sites in four countries, Phibion applies its operational experience to continually improve its approach to tailings management.

The goal is to help mining companies make tailings storage facilities safer, smaller and more sustainable while improving operational and economic performance.

Looking to optimise tailings management at your operation?

Contact Phibion to discuss your tailings dewatering challenges and assess whether Accelerated Mechanical Consolidation could support your site's operational objectives.

Learn more at Phibion or explore our AMC assessment.