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Laboratory Study of Gypsum Dissolution Rates for an Abandoned Underground Mine

  • Mohammadhossein SadeghiamirshahidiEmail author
  • Stanley J. Vitton
Original Paper
  • 80 Downloads

Abstract

Groundwater reestablishment in abandoned gypsum mines causes pillar dissolution until the groundwater reaches the groundwater’s gypsum saturation potential. In some cases, however, especially in shallow mines, groundwater can continue to flow through the mine resulting in the additional dissolution of the mine’s support pillars leading to possible pillar collapse. Pillar dissolution will depend on the amount and quality of the groundwater flowing through the mine and the dissolution rate of the gypsum. The Domtar Mine in Grand Rapids Michigan operated for over 140 years mining a 30-m-deep high-quality gypsum deposit. In 2000, the mine was abandoned with the removal of the mine’s dewatering pumps allowing the groundwater to flood the mine. The mine is located along the north side of the Grand River and has groundwater flowing through the mine to the Grand River. Interstate I-196 is located over the east side of the mine. To analyze the stability of the mine’s pillars, the gypsum dissolution rate was investigated. In this research, laboratory experiments were conducted to investigate the dissolution rate of natural gypsum in both stagnant and flowing water. The existing published dissolution rates were reviewed and compared to the investigation’s results. The tests confirmed that the dissolution can be represented by a first-order kinetic equation. The normalized dissolution coefficient was measured for stagnant water at 1.6 × 10−3 (cm/s) following the power law of k = 0.0021F0.1854 for flowing water, where F is the water’s flow rate and k is dissolution coefficient.

Keywords

Abandoned underground mine Long-term stability Gypsum dissolution First-order kinetics Domtar gypsum mine Michigan basin gypsum 

List of Symbols

m

Mass (g)

T

Time (s)

K

Dissolution coefficient (cm3/s)

K

Normalized dissolution coefficient (cm/s)

K

Concentration-based dissolution coefficient (s−1)

K

Second-order dissolution coefficient (mol−1 cm−3 s−1)

Cs

Solution concentration (in respect to gypsum dissolution products) at saturation (g/cm3)

C

Solution concentration (in respect to gypsum dissolution products) at time (t) (g/cm3)

A

Surface area of gypsum in contact with water (cm2)

D

Diameter of specimens (cm)

H

Length (height) of specimens (cm)

F

Water flow rate (mL/s)

SDM

Surface dried mass (g)

Notes

Acknowledgements

Authors would like to thank the Tawas Quarry management for providing the gypsum samples used in this research.

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Civil and Environmental EngineeringMichigan Technological UniversityHoughtonUSA

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