Attenuation of aqueous metal transport at two natural acid rock drainage occurrences in the Yukon Territory, Canada

2006 ◽  
Vol 25 (S1) ◽  
pp. 229-230 ◽  
Author(s):  
Y. T. John Kwong
Keyword(s):  
Acid Rock Drainage ◽  
Metal Transport ◽  
Yukon Territory ◽  
Acid Rock

Natural acid rock drainage associated with black shale in the Yukon Territory, Canada

2009 ◽  
Vol 24 (2) ◽  
pp. 221-231 ◽  
Author(s):  
Y.T. John Kwong ◽  
Gerry Whitley ◽  
Patrick Roach
Keyword(s):  
Black Shale ◽  
Acid Rock Drainage ◽  
Yukon Territory ◽  
Acid Rock

Natural attenuation of aqueous metal contamination by an algal mat

1998 ◽  
Vol 44 (9) ◽  
pp. 825-832 ◽  
Author(s):  
J R Lawrence ◽  
GDW Swerhone ◽  
YTJ Kwong
Keyword(s):  
Acid Rock Drainage ◽  
Yukon Territory ◽  
Epifluorescence Microscopy ◽  
Confocal Scanning Laser Microscopy ◽  
Acid Rock ◽  
Filamentous Green Algae ◽  
Lectin Staining ◽  
The Matrix ◽  
Confocal Scanning Laser ◽  
Algal Mat

Naturally occurring mechanisms of attenuation for metals in the environment are important for understanding and remediating acid rock drainage. A filamentous green algae was found forming an extensive mat below an outflow of acidic, metal-laden groundwater, at Macintosh Creek, MacMillan Pass, Yukon Territory, Canada. Emerging waters had a pH of 3.3 and the following dissolved metal concentrations in milligrams per litre: Al = 156, Fe = 298, Mn = 1.1, Cd = 0.13, Ni = 2.52, Cu = 0.69, and Zn = 5.0. In contrast, waters that had coursed over the algal mat had the following concentrations in milligrams per litre: Al = 26.4, Fe = 29.3, Mn = 0.18, Cd = 0.03, Ni = 0.4, Cu = 0.2, Zn = 0.88. In addition, the concentration of dissolved As declined from 32.9 to 9.3 µg·L-1. Thus, the concentrations of potentially deleterious elements were typically reduced by between 5- and 10-fold. Scanning electron microscopy (SEM) indicated that individual filaments of the algae were encrusted with mineral precipitate. Microprobe analyses indicated that the coatings were predominantly composed of Fe with other metals, in the presence of S and P, the latter possibly associated with the algal biomass. While culturing methods indicated the presence of 104-106 Thiobacillus ferrooxidans·mL-1 in the water, epifluorescence microscopy observations using DAPI and SYTO 9 nucleic acid stains did not reveal bacteria in association with the algal filaments. Hydrated samples were also observed using confocal scanning laser microscopy (CSLM) with FITC-conjugated lectin staining, autofluorescence, and reflection imaging. These observations indicated that the algal filaments had an extensive exopolysaccharide surrounding the filaments and that mineralization occurred within the matrix. This suggested that factors such as the Eh and pH proximal to the algae may be playing an important role in mineral production.Key words: heavy metals, exopolymers, acid drainage, confocal microscopy.

PREDICTING ACID ROCK DRAINAGE FROM A NICKEL MINE WASTE PILE AND METAL LEVELS IN SURROUNDING SOILS

2017 ◽  
Vol 16 (9) ◽  
pp. 2089-2096
Author(s):  
Artwell Kanda ◽  
George Nyamadzawo ◽  
Jephita Gotosa ◽  
Nathan Nyamutora ◽  
Willis Gwenzi
Keyword(s):  
Acid Rock Drainage ◽  
Mine Waste ◽  
Acid Rock ◽  
Metal Levels

Small-scale field evaluation of geochemical blending of waste rock to mitigate acid rock drainage potential

2021 ◽  
pp. geochem2021-066
Author(s):  
S.J. Day
Keyword(s):  
Acid Rock Drainage ◽  
Field Evaluation ◽  
Waste Rock ◽  
Small Scale ◽  
Proof Of Concept ◽  
Acidic Water ◽  
Acid Rock ◽  
Acid Generation ◽  
Acidic Waters ◽  
Critical Consideration

Blending of potentially acid generating (PAG) waste rock with non-PAG waste rock to create a rock mixture which performs as non-PAG is a possible approach to permanent prevention of acid rock drainage (ARD) for PAG waste rock. In 2012, a field weathering study using 300 kg samples was implemented at Teck Coal's Quintette Project located in northeastern British Columbia, Canada to test the prevention of acid generation in the PAG waste rock by dissolved carbonate leached from overlying non-PAG waste rock and direct neutralization of acidic water from PAG waste rock by contact with non-PAG waste rock.After eight years of monitoring the experiments, the layered non-PAG on PAG barrels provided proof-of-concept that as the thickness of the PAG layer increases relative to the thickness of the non-PAG layers, acidic waters are more likely to be produced. The PAG on non-PAG layering has resulted in non-acidic water and no indications of metal leaching despite accelerated oxidation in the PAG layer shown by sulphate loadings. The study has demonstrated that the scale of heterogeneity of PAG and non-PAG materials is a critical consideration for providing certainty that rock blends designed to be non-PAG will perform as non-PAG in perpetuity. This is contrary to the standard paradigm in which an excess of acid-consuming minerals is often considered sufficient alone to ensure ARD is not produced.

scholarly journals The Formation of Silicate-Stabilized Passivating Layers on Pyrite for Reduced Acid Rock Drainage

2017 ◽  
Vol 51 (19) ◽  
pp. 11317-11325 ◽  
Author(s):  
Rong Fan ◽  
Michael D. Short ◽  
Sheng-Jia Zeng ◽  
Gujie Qian ◽  
Jun Li ◽  
...  
Keyword(s):  
Acid Rock Drainage ◽  
Acid Rock

Geochemical Characterization for Prediction of Acid Rock Drainage Potential in Hydrothermal Deposit

2014 ◽  
pp. 773-779
Author(s):  
Rudy Sayoga Gautama ◽  
Ginting Jalu Kusuma ◽  
Dyah Firgiani ◽  
Salmawati Mustakar ◽  
Prasetyaningtyas Ekarini
Keyword(s):  
Acid Rock Drainage ◽  
Hydrothermal Deposit ◽  
Acid Rock ◽  
Geochemical Characterization

Environmental risk assessment of acid rock drainage under uncertainty: The probability bounds and PHREEQC approach

2016 ◽  
Vol 301 ◽  
pp. 187-196 ◽  
Author(s):  
Getnet D. Betrie ◽  
Rehan Sadiq ◽  
Craig Nichol ◽  
Kevin A. Morin ◽  
Solomon Tesfamariam
Keyword(s):  
Risk Assessment ◽  
Environmental Risk ◽  
Environmental Risk Assessment ◽  
Acid Rock Drainage ◽  
Acid Rock ◽  
Probability Bounds

scholarly journals Acid-rock drainage at Skytop, Centre County, Pennsylvania, 2004

2005 ◽  
Author(s):  
Jane M. Hammarstrom ◽  
Keith Brady ◽  
Charles A. Cravotta
Keyword(s):  
Acid Rock Drainage ◽  
Acid Rock
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