Minesite Drainage Assessment Group (MDAG)

Time 2020-10-19 21:05:28

Web Name: Minesite Drainage Assessment Group (MDAG)

WebSite: http://mdag.com

ID:87517

Keywords:

Drainage,Minesite,Assessment,

Description:

Minesite Drainage Assessment Groupwww.MDAG.comMINESITES, MINING, AND THE ENVIRONMENTMDAG.com: Online Since 1997Providing Valuable Technical Information on Minesite Drainage,and on the Environmental Geochemistry of Highly Reactive Geologic MaterialsIn 2020, Dr. Kevin Morin of MDAG celebrates 40 years of publishing with his first co-authored journal publicationin 1980. This paper examined physical-hydrogeologic properties of rock and mined materials at full-scale coal minesites in the USA and Canada.************************MDAG Case Study 64 is now available. It focusses on answering two questions for minesite components.1) What mechanisms and processes can introduce periodicity into minesite-drainage chemistry and flow? In other words, why do flow and chemistry "pulsate" at many wavelengths? This behaviour is more "ubiquitous" in non-mining catchments.2) How do these mechanisms apparently "self organize" so that their amplitudes and spectral powers generally decrease with decreasing wavelength, often forming fractal spectral slopes? This includes the very common yet mysterious "1-over-f" with afractal spectral slope of 1.0, which should not appear and should not persist according to mathematics.Assuming the answers to these questions are correct, then both periodicity and fractal spectral slopes ARE expected from anyrelatively large minesite component well connected to the earth. They are normal characteristics and can include effects from cycles such as(1) the 11-yr sunspot cycle, (2) the 2.38-yr quasi-biennial oscillation in tropical zonal winds, (3) rotational gravity waves,and (4) various tides driven by motions of the moon and sun relative to the earth. This explains why periodicities and fractal spectral slopes are always observed in the few mining and non-mining monitoring databases sufficient to detect them.************************The third generation of MineWall, Version 3.0, has been released. Originally developed for the Canadian MEND Program with approximately 700 pages of documentation, the MineWall model simulates open pits and underground mines during active dewatering (operation), during transient flooding and geochemical flushing after dewatering is stopped (short-term closure),and after a stable water level has been established (long-term closure). This model includes the geochemical effects of fractured mine walls and of any granular material(like tailings and waste rock) present in or backfilled into the mine. MineWall 3 can be downloaded for free, starting here.************************The most recent MDAG case studies available for free download are:#64, Minesite Components as Large Physical Analogues of First-Order Low-Pass Signal Filters, Explaining 1-over-f and Other Fractal Spectral Slopes for Flows and Chemistries#63, Planetary and Large-Scale Processes Affecting Minesite-Drainage Flows and Chemistries#62, Problems and Errors with Interpreting Humidity Cells Using Weight-Based Results (e.g., Oxidation-Neutralization Curve) Rather Than Mole-Based Results#61, Complexities in Heat Generation and Self-Heating of Mined Materials - a Review#60, Geochemical Transitions from Near-Neutral to Acidic Conditions in Minesite Drainage - Chaotic or Organized?Ma, L., C. Huang, Z-S Liu, K.A. Morin, M. Aziz, and C. Meints. Submitted.The correlation between drainage chemistry and weather for full-scale waste rock piles based on artificial neural network.In review by the Journal of Contaminant Hydrology.Huang, C., L. Ma, Z-S. Liu, E. Dy, K. Tufa, E. Fisher, J. Zhou, M. Goulet, K. Morin, and M. Paradis. Accepted.Gas Transport inside Co-disposal of Desulfurized Tailings and Sulfidic Waste Rocks.IN: Tailings and Mine Waste 2020 Virtual Event, November 15-18, Colorado State University, Colorado, USA.Ma, L., C. Huang, Z-S. Liu, K.A. Morin, E. Dy, K. Tufa, E. Fisher, J. Zhou, M. Aziz, and C. Meints. 2020.A full-scale case study on the leaching process of acid rock drainage in waste rock piles and the net infiltration through cover systems.Water, Air, and Soil Pollution, 231:305. Published online 11 June 2020. DOI: 10.1007/s11270-020-04660-5.Ma, L., C. Huang, Z-S. Liu, K.A. Morin, M. Aziz, and C. Meints. 2020. Artificial neural network for prediction of full-scale seepage flow rate at the Equity Silver Mine. Water, Air, and Soil Pollution 231:179. Published online 14 April 2020. DOI: 10.1007/s11270-020-04541-x.Morin, K.A. 2019. Application of spectral analysis and wavelet transforms to full-scale dynamic drainages at minesites. Springer Nature (SN) Applied Sciences 1:1058, published online August 2019. DOI: 10.1007/s42452-019-1102-3. Online and free-downloadversions at Springer.com at https://link.springer.com/epdf/10.1007/s42452-019-1102-3************************Five technical books on minesite drainage and highly reactive geologic materials are available here at MDAG.com, free of charge.1) Wavelet Transforms of Drainage from Highly Reactive Geologic Materials; ISBN 978-0-9952149-3-42) Searching for Latent Variables in Minesite Drainage Using Exploratory Factor Analysis; ISBN 978-0-9952149-2-73) Spectral Analysis of Drainage from Highly Reactive Geologic Materials; ISBN 978-0-9952149-1-04) Environmental Geochemistry of Minesite Drainage: Practical Theory and Case Studies; ISBN 0-9682039-1-45) Minesite Drainage Chemistry: An Introduction; ISBN 978-0-9952149-0-3We have also published and co-published 94 informative papers at conferences and in journals. ************************Adverse environmental effects can arise from water draining over and through highly reactive materials,such as mining wastes. We steadfastly believe that these adverse effects can only be understood, predicted, moderated, and remediated reliably by thoroughly understanding past competent work and by carefully studying full-scale sites.Heed the old words of wisdom: Those who ignore the past are doomed to repeat it . Is that why we hear that up to 90% of predictions of minesite-drainage chemistry are too low, and remain too low for newer minesites, leading to unexpected costs and adverse environmental effects for mining companies and taxpayers? The public is starting to pay closer attention to these errors and unexpected costs, with mining companies losing credibility. This is why we at MDAG heavily emphasize real case studies with abundant data, followed by theory and modelling in subordinate roles.Privacy Policy: We don't know who you are and we do not try to find out. Enjoy thesite!

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