Conference Agenda

Mine Drainage Chemistry
Monday, 12/July/2021:
10:10am - 12:15pm

Session Chair: Christopher James Satterley
Location: Meeting Room 1

10:10am - 10:35am

Offscreen-Break Due to No-show or Last Minute Cancellation

IMWA 2021 Organizers

International Mine Water Association

10:35am - 11:00am

REE Enrichment Pattern in Acid Mine Drainage and Overburden from Coal Mine in Indonesia

Abie Badhurahman, Rudy Sayoga Gautama, Ginting Jalu Kusuma

Department of Mining Engineering, Institut Teknologi Bandung, Indonesia

Geochemical characteristics of REE in AMD and overburden from PT Bukit Asam coal mine, Indonesia were investigated from 11 AMD samples and 24 overburden samples.

Similarity between enrichment type of AMD and overburden samples shows that processes controlling REE enrichment in AMD is somewhat relate to the source of REE. Further study on the mechanism of REE enrichment from overburden to AMD to determine whether the mechanism is controlled by the source of REE or the geochemical characteristics of AMD is needed to obtain more information of processes of REE enrichment in AMD.

11:00am - 11:25am

Natural Tracers For Mine Water Fingerprinting – A First Step To A Hydrogeochemical Monitoring Plan For Risk Assessment During Mine Water Rebound In The Ruhr District Area, Germany

Henning Jasnowski-Peters, Christian Melchers

Research Center of Post Mining, Technische Hochschule Georg Agricola - University, Bochum, Germany

Bromide as natural tracer in combination with hydrochemistry and isotope geochemistry has been applied to distinguish regional aquifers from mine water derived from Upper Carboniferous hosted former hard coal mining area in the Ruhr District, Germany. The hydrogeochemical dataset successfully identified different origins of salinity, i.e. halite dissolution vs. seawater evaporation. Cl/Br ratios and molar Na/Cl ratios of mine water differ significantly compared to groundwater in Upper Cretaceous host rocks consisting of Coniacian-Santonian and Cenomanian-Turonian fractured aquifers. The bromide tracer has the potential to be used for risk management purposes during mine water rebound in order to verify containment.

11:25am - 11:50am

Simulation of Column Leach Tests using Reactive Transport Modelling

Yuan Tian1, Johan Fourie2, Brent Usher2

1Golder Associates, Australia; 2Klohn Crippen Berger , Australia

Reactive transport modelling has become an increasingly powerful tool to assist the mining industry for assessing the long-term geochemical behaviour of mine waste materials during operation and post-closure periods.The reactive transport models were developed in this study to model the key geochemical processes that control sulfide oxidation and subsequent chemical reactions (e.g. dissolution/precipitation) for lab scale column leach tests. The models were refined to allow calibration of kinetic rates of several of the waste rock minerals based on leachate data. The reactive transport models form the basis of the predictive model of drainage water quality for full-scale mine waste facilities.

11:50am - 12:15pm

Application of Multivariate Statistical Analysis in Mine Water Hydrogeochemical Studies of the Outcropped Upper Carboniferous, Ruhr Area, Germany

Tuan Quang Tran1,2, Andre Banning1,3, Stefan Wohnlich1

1Hydrogeology Department, Faculty of Geosciences, Ruhr University Bochum, Germany; 2Hydrogeology Department, Faculty of Geosciences and Geoengineering, Hanoi University of Mining and Geology, Vietnam; 3School of Biological, Earth and Environmental Sciences, University College Cork, Ireland

This study aimed to identify the processes controlling geochemical characteristics of adit mine waters using correlation analysis and multivariate statistical techniques.

Hierarchical cluster analysis classified water samples into 5 geochemically distinct clusters. HCO3- and Ca2+ were the dominant ions in 4 clusters indicating carbonate dissolution, while a Na+ dominated cluster suggests processes of rock weathering and ion exchange.

In PCA, a total of three principal components accounted for 82.95% of the total variance, interpreted to represent general water-rock-interaction processes and more local and geological effects.

This study demonstrated the usefulness of multivariate statistical analysis in hydrogeochemistry.