scholarly journals Sequential Extraction Results and Mineralogy of Mine Waste and Stream Sediments Associated With Metal Mines in Vermont, Maine, and New Zealand

2007 ◽  
Author(s):  
N.M. Piatak ◽  
R.R. Seal ◽  
R.F. Sanzolone ◽  
P.J. Lamothe ◽  
Z.A. Brown ◽  
...  
Keyword(s):  
New Zealand ◽  
Sequential Extraction ◽  
Mine Waste ◽  
Stream Sediments ◽  
Metal Mines

Fractionation of copper and uranium in organic and conventional vineyard soils and adjacent stream sediments studied by sequential extraction

2016 ◽  
Vol 17 (4) ◽  
pp. 1092-1100 ◽  
Author(s):  
Zacharias Steinmetz ◽  
Kilian G. J. Kenngott ◽  
Mohamed Azeroual ◽  
Ralf B. Schäfer ◽  
Gabriele E. Schaumann
Keyword(s):  
Sequential Extraction ◽  
Stream Sediments ◽  
Vineyard Soils

Mineralogical controls on arsenic mobility in the Baccu Locci stream catchment (Sardinia, Italy) affected by past mining

2004 ◽  
Vol 68 (1) ◽  
pp. 15-30 ◽  
Author(s):  
F. Frau ◽  
C. Ardau
Keyword(s):  
Mine Waste ◽  
Extraction Procedure ◽  
Selective Extraction ◽  
Stream Sediments ◽  
Waste Materials ◽  
Contamination Source ◽  
Molar Ratios ◽  
Arsenic Mobility ◽  
Chemical Techniques ◽  
Sequential Selective Extraction

AbstractMineralogical-chemical techniques (XRD, SEM/EDX, WDXRF) and a sequential selective extraction procedure were applied to mine-waste materials and stream sediments from the Baccu Locci stream catchment (Sardinia, Italy) affected by serious As contamination as a consequence of past mining. Results indicate that solid-state speciation of As is mainly dominated by the presence of Fe(III) hydroxides (arsenical ferrihydrites with various Fe/As molar ratios) occurring as coatings of silicate grains, in which As is contained as sorbed or co-precipitated species. Scorodite (FeAsO4·2H2O) is common too, whereas arsenopyrite is generally subordinate but, owing to its relatively rapid oxidation, environmentally significant. Moreover, some unidentified arsenates of Ca-Fe or K-Fe were also detected. Arsenic contained in these phases is slowly, but continuously, released in relatively small amounts through three main mechanisms: (1) oxidation of residual arsenopyrite to scorodite; (2) decomposition of scorodite into a hydroxide or oxide of Fe(III); (3) desorption/release from Fe(III) hydroxides. Decomposition of the unidentified arsenates is also probable, e.g. Ca-Fe arsenate → calcite + Fe(III) hydroxide + As release. The flotation tailings are widely scattered and distributed in the middle–lower Baccu Locci stream catchment, and represent the most dangerous As-generating contamination source in the study area.

scholarly journals Characterization of Mine Waste and Acid Mine Drainage Prediction by Simple Testing Methods in Terms of the Effects of Sulfate-Sulfur and Carbonate Minerals

Minerals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 403 ◽  
Author(s):  
Shinji Matsumoto ◽  
Hirotaka Ishimatsu ◽  
Hideki Shimada ◽  
Takashi Sasaoka ◽  
Ginting Kusuma
Keyword(s):  
Acid Mine Drainage ◽  
Sequential Extraction ◽  
Mine Drainage ◽  
Mine Waste ◽  
Characteristic Curve ◽  
High Tech ◽  
Leaching Test ◽  
Testing Methods ◽  
Acid Mine

Characterization of mine waste rocks and prediction of acid mine drainage (AMD) play an important role in preventing AMD. Although high-tech analytical methods have been highlighted for mineral characterization and quantification, simple testing methods are still practical ways to perform in a field laboratory in mines. Thus, this study applied some simple testing methods to the characterization of mine wastes and AMD prediction in addition to a leaching test and the sequential extraction test with HCl, HF, and HNO3, which have not been applied for these purposes, focusing on the form of sulfur and the neutralization effects of carbonates. The results of the Acid Buffering Characteristic Curve test supported the changing trend of the pH attributing carbonates only during the first 10 leaching cycles in the leaching test. The change in the Net Acid Generating (NAG) pH in the sequential NAG test reflected the solubility of sulfur in the rocks, providing information on the form of sulfur in the rocks and the acid-producing potential over time. Consequently, the sequential NAG test and sequential extraction with the acids in combination with the current standards tests (Acid Base Accounting and NAG tests) provided important information for preventing AMD.

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