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A variable-volume, head-dependent mine water filling model.

D Banks1

  • 1Holymoor Consultancy, 86 Holymoor Rd., Holymoorside, Chesterfield, S42 7DX, United Kingdom. david@holymoor.force9.co.uk

Ground Water
|May 9, 2001
PubMed
Summary

A new Mine Water Filling Model (MIFIM) improves accuracy by considering mine void volume changes and variable groundwater inflows. This enhanced approach is suitable for mines with low permeability rock and limited discrete inflow features.

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Area of Science:

  • Hydrogeology
  • Mine Water Management
  • Environmental Engineering

Background:

  • Existing mine water filling models often oversimplify by not accounting for depth-dependent void volumes.
  • A key limitation is the assumption of constant recharge, which does not reflect real-world hydrological conditions.
  • These simplifications can lead to inaccurate predictions of mine water levels and behavior.

Purpose of the Study:

  • To introduce an improved Mine Water Filling Model (MIFIM) that addresses limitations of current models.
  • To incorporate variable mine void volumes and dynamic groundwater inflows into mine water simulations.
  • To provide a more realistic and programmable tool for mine water management.

Main Methods:

  • The study introduces the concept of effective area (Ea) using a lookup table to represent variable void volumes.
  • Deep groundwater inflows are assigned a conductance, allowing inflow rates to vary inversely with mine water head.
  • The model is designed for easy implementation in spreadsheet software, facilitating simple graphical output.

Main Results:

  • The MIFIM successfully rectifies the drawbacks of previous models by accounting for depth-varying mine void volumes.
  • The model demonstrates how to simulate variable groundwater inflows that respond to changes in mine water head.
  • The approach is particularly effective for mines characterized by low permeability rock and a limited number of discrete inflow points.

Conclusions:

  • The developed Mine Water Filling Model (MIFIM) offers a more accurate simulation of mine water dynamics.
  • Its design facilitates practical application in spreadsheet environments for mine water management.
  • MIFIM is a valuable tool for assessing mine water behavior in specific geological conditions, particularly low-permeability environments.