1. Dear Reader

   • Bob Kleinmann

   Dear Readers 21 August 2021 Pages: 555 - 556

2. Mine Water and the Environment: History Until Volume 40 and the New Cover Design

   • Christian Wolkersdorfer

   IMWA Insights 26 July 2021 Pages: 557 - 561

   

3. IMWA’s Early History (1978–1985)

   • Rafael Fernández Rubio
   • Roy E. Williams

   IMWA Insight 18 July 2021 Pages: 562 - 566

   

4. 40 Years of IMWA in Poland

   • Andrzej J. Witkowski

   IMWA Insights 19 June 2021 Pages: 567 - 569

   

5. Environmental Stability of Schwertmannite: A Review

   • Susanta Paikaray

   Review 25 November 2020 Pages: 570 - 586

   

6. The Role of Macrophytes in Constructed Surface-flow Wetlands for Mine Water Treatment: A Review

   • Joscha Opitz
   • Matthias Alte
   • Stefan Peiffer

   Review Open access 20 April 2021 Pages: 587 - 605

   

7. Monitoring Acid Mine Drainage’s Effects on Surface Water in the Kizel Coal Basin with Sentinel-2 Satellite Images

   • Sergey V. Pyankov
   • Nikolay G. Maximovich
   • Rinat K. Abdullin

   Technical Article 18 February 2021 Pages: 606 - 621

   

8. Water Seepage Mapping in an Underground Coal-Mine Barrier Using Self-potential and Electrical Resistivity Tomography

   • Rajwardhan Kumar
   • Sanjit Kumar Pal
   • Praveen Kumar Gupta

   Technical Article 15 June 2021 Pages: 622 - 638

   

9. Predicted Post-Closure Aqueous Geochemistry at the Cortez Hills Underground Mine, Nevada, USA

   • Andy Davis
   • Maggy Lengke
   • Nathan Sims

   Technical Article 31 August 2021 Pages: 639 - 656

   

10. Prediction and Prevention of Water Inrush Hazards from Bed Separation Space

    • Luyuan Wu
    • Haibo Bai
    • Dan Ma

    Technical Article 05 January 2021 Pages: 657 - 670

    

11. Hydrogeological Analysis of Sulfide Tailings at a Uranium Mine Using Geophysical and Hydrochemical Methods

    • Débora Andrade Targa
    • César Augusto Moreira
    • Matheus Felipe Stanfoca Casagrande

    Technical Article 15 June 2021 Pages: 671 - 689

    

12. The Water Resisting Properties of the Top Portion of the Ordovician Limestone Aquifer in the North China Coalfield

    • Hao Wang
    • Shuning Dong
    • Hongbo Shang

    Technical Article 25 May 2021 Pages: 690 - 700

    

13. Combining Surface Water with Mine Water to Improve the Removal of Natural Organic Matter by Enhanced Coagulation

    • Sonalika Sonal
    • Devyani Ugale
    • Brijesh Kumar Mishra

    Technical Article 05 January 2021 Pages: 701 - 712

    

14. Dynamic Response of a Non-Darcian Seepage System in the Broken Coal of a Karst Collapse Pillar

    • Tian-jun Zhang
    • Ming-kun Pang
    • Hong-yu Pan

    Technical Article 03 June 2021 Pages: 713 - 721

    

15. Geochemistry of Mine Stream Sediments and the Control on Potentially Toxic Element Migration: A Case Study from the Baccatoio Basin (Tuscany, Italy)

    • Lisa Ghezzi
    • Antonella Buccianti
    • Riccardo Petrini

    Technical Article 26 June 2021 Pages: 722 - 735

    

16. A Test of Two Methods for Waste Rock Drainage Quality Prediction: Aqua Regia Extraction and Single-addition Net-acid Generation Test Leachate Analysis

    • Teemu Karlsson
    • Lena Alakangas
    • Marja Liisa Räisänen

    Technical Article Open access 21 May 2021 Pages: 736 - 751

    

17. Random Mixing of Acid Generating and Neutralizing Waste Rock as a Management Strategy at the Gold Acres Mine, NV USA

    • Andy Davis
    • C. Whitehead
    • M. Lengke

    Technical Article 21 July 2021 Pages: 752 - 772

    

18. A Multilevel Recognition Model of Water Inrush Sources: A Case Study of the Zhaogezhuang Mining Area

    • Gang Lin
    • Dong Jiang
    • Xiang Li

    Technical Communication 04 July 2021 Pages: 773 - 782

    

19. Prospective Analysis of Artisanal Mining in the Santa Rita Village: Municipality of Andes, Antioquia

    • Didier Camilo Sierra florez
    • Luz Stella Gaona

    Technical Communication 03 May 2021 Pages: 783 - 792

    

20. Key Aquiclude Strata Reconstruction and Fluid–Solid Coupled Deformation Mechanism Study for Backfill Coal Mining

    • Qiang Sun
    • Jixiong Zhang
    • Yanli Huang

    Technical Communication 12 June 2021 Pages: 793 - 802

    

21. Valanko et al.: About Water Treatment (Book Review)

    • Christian Wolkersdorfer

    IMWA Insights 14 April 2021 Pages: 803 - 804

    

22. Michael Eckart 1959–2020

    • Michael Paul
    • Jens-Peter Lux

    IMWA Insights 10 March 2021 Pages: 805 - 807