Mine Dewatering and Hydrogeology of Mining Operations

Lesson 1 • The Hydrological Cycle in Mining Contexts

Covers precipitation, infiltration, runoff, and evapotranspiration as they apply to mine sites. Provides the physical framework for understanding water sources affecting operations.

Lesson 2 • Aquifer Types and Properties

Defines confined, unconfined, and perched aquifers and their hydraulic properties. Distinguishes aquifer behaviour critical for predicting water inflow to excavations.

Lesson 3 • Geochemistry of Mine Water

Examines dissolved constituents, pH, and redox conditions in groundwater at mine sites. Establishes baseline chemistry knowledge for treatment and discharge planning.

Lesson 4 • Groundwater Flow Principles

Introduces Darcy's Law and hydraulic gradient concepts governing groundwater movement. Connects flow theory to predicting water migration toward mine workings.

Lesson 1 • Conceptual Hydrogeological Model Development

Integrates geological, geophysical, and hydraulic data into a coherent site model. The conceptual model drives all subsequent numerical modelling and dewatering design.

Lesson 2 • Groundwater Level Monitoring Networks

Designs piezometer networks to track water table and piezometric surface changes over time. Monitoring data validates conceptual models and guides operational decisions.

Lesson 3 • Aquifer Testing Methods

Teaches pumping tests, slug tests, and packer tests to quantify aquifer hydraulic parameters. Results directly inform dewatering system capacity and drawdown predictions.

Lesson 4 • Borehole Drilling and Logging

Covers drilling methods, core recovery, and geophysical logging for hydrogeological investigation. Produces subsurface data essential for aquifer characterisation.

Lesson 1 • Water Balance Modelling for Mine Sites

Constructs site-wide water balance integrating surface water, groundwater, and process water. Identifies surplus and deficit periods to schedule dewatering operations.

Lesson 2 • Analytical Methods for Inflow Estimation

Applies closed-form equations to estimate steady-state and transient inflow to excavations. Provides rapid screening tools before numerical modelling is undertaken.

Lesson 3 • Underground Mine Inflow Scenarios

Models water inflow to shafts, drives, and stopes under varying geological conditions. Addresses sudden inrush risk and long-term drainage planning for underground operations.

Lesson 4 • Numerical Groundwater Modelling Fundamentals

Introduces finite-difference and finite-element modelling concepts for mine hydrogeology. Students understand model construction, calibration, and predictive simulation workflows.

Lesson 1 • Sump and Trench Drainage Systems

Designs in-pit sumps, ditches, and trenches to collect and remove surface and seepage water. Addresses sump sizing, pump selection, and sediment management.

Lesson 2 • Horizontal Drains and Drainage Galleries

Applies horizontal drain technology to depressurise pit slopes and intercept shallow aquifers. Explains installation methods, drain spacing, and performance monitoring.

Lesson 3 • Dewatering System Performance Monitoring

Establishes key performance indicators and monitoring protocols for open pit dewatering. Enables adaptive management when drawdown targets are not being achieved.

Lesson 4 • Dewatering Strategy Selection

Evaluates pre-drainage, in-pit, and perimeter dewatering strategies against site conditions. Matching strategy to geology and pit geometry minimises cost and operational disruption.

Lesson 1 • Underground Drainage Infrastructure Design

Designs sumps, pump stations, and drainage drives to manage water in underground mines. Covers hydraulic gradient design and infrastructure placement relative to mine development.

Lesson 2 • Shaft and Decline Dewatering

Manages water ingress during shaft sinking and decline development in wet ground conditions. Covers pre-grouting, cementation, and temporary pumping arrangements.

Lesson 3 • Inrush Prevention and Emergency Response

Identifies inrush triggers and designs barriers, bulkheads, and monitoring systems to prevent catastrophic water entry. Prepares students to develop and execute emergency response plans.

Lesson 4 • Abandoned Workings and Rebound Management

Predicts groundwater rebound in flooded abandoned workings and manages associated risks. Addresses water quality deterioration and surface subsidence during rebound.

Lesson 1 • Discharge Permitting and Compliance

Navigates environmental permitting processes for mine water discharge to surface water bodies. Covers monitoring plans, reporting obligations, and non-compliance response procedures.

Lesson 2 • Passive Treatment Systems

Designs constructed wetlands, anoxic limestone drains, and permeable reactive barriers for low-flow treatment. Passive systems reduce long-term operational costs for post-closure scenarios.

Lesson 3 • Water Reuse and Recycling in Mining

Identifies opportunities to reuse treated mine water in processing, dust suppression, and drilling. Reduces freshwater demand and discharge volumes through internal water cycling.

Lesson 4 • Active Treatment Technologies

Evaluates lime neutralisation, coagulation, flocculation, and membrane filtration for mine water treatment. Sizes treatment units based on flow rate and contaminant load.

Lesson 1 • Land Subsidence from Groundwater Extraction

Evaluates consolidation and subsidence risk in compressible sediments above dewatered aquifers. Links subsidence predictions to infrastructure protection and regulatory compliance.

Lesson 2 • Environmental Impact Assessment for Dewatering

Structures an environmental impact assessment specifically for mine dewatering proposals. Covers baseline studies, impact prediction, mitigation hierarchy, and adaptive management.

Lesson 3 • Drawdown Impacts on Regional Aquifers

Quantifies the extent and magnitude of water table decline caused by mine dewatering. Predicts impacts on neighbouring water users, ecosystems, and groundwater-dependent features.

Lesson 4 • Slope Stability and Pore Pressure Management

Integrates pore pressure data with geotechnical slope models to assess and manage failure risk. Depressurisation targets are set to maintain acceptable factors of safety.

Lesson 1 • Life-of-Mine Dewatering Planning

Develops phased dewatering plans aligned with mine development schedules and pit expansion stages. Ensures dewatering capacity is available ahead of mining needs at each phase.

Lesson 2 • Risk Management in Dewatering Operations

Identifies technical, environmental, and operational risks in dewatering and assigns mitigation controls. A risk register approach ensures systematic management throughout the mine life.

Lesson 3 • Capital and Operating Cost Estimation

Estimates capital costs for wells, pumps, and pipelines and operating costs for power and maintenance. Cost models support feasibility studies and dewatering budget allocation.

Lesson 4 • Regulatory compliance and reporting

Aligns dewatering operations with environmental authorisation conditions and groundwater licensing requirements. Covers data reporting, audit preparation, and regulator engagement.