Journal of Mining Engineering

Journal of Mining Engineering

The spatial modeling of hazardous elements in one of the Angouran mine waste dumps using a geostatistical approach

Document Type : research - paper

Authors
Abbas Sharafi 1
Hamed Beigi 2
Bahram Rezaei 3
Jafar Sargheini 4
1 Emidro
2 University of Tehran
3 Amir Kabir University of Technology
4 Azad University, South Tehran Branch
10.22034/ijme.2020.104306.1705
Abstract
Mining operations and waste resulting from it can be considered as one of the most important sources of hazardous elements in the environment. Identification of the spatial distribution of toxic elements in the mine waste dump systems requires the assessment of environmental hazards and strategies. To achieve the goal, the sampling was conducted on a waste dump located in the east of Angouran mine at an area of 300,000 square meters. For this purpose, 38 soil samples were selected for study and modeling. Statistical studies of the data set for As, Cd, Cu and Co elements were performed. In addition, Q-Q plot was used to remove outlier from the data, which resulted in an increase in the correlation coefficient of the results. In the next step, statistical analyses were performed to determine variogram parameters for the studied elements and the distribution of toxic elements was modeled on the basis of sequential Gaussian simulation (SGS) method, which results in high concentrations As in the south, west, and north of the dump. Elevated concentration of Cd can be seen in the southwest and northeast parts of the dump. Also, high concentrations of Co and Cu accumulate in the western, southern and northern parts of the dump. In order to validate variograms, cross-validation method was employed which is a fundamental method for comparing the effect of different variogram models and simulation methods on interpolation results. Correlation coefficients for As, Cd, Cu and Co elements were 0.885, 0.8056, 0.6867 and 0.9792, which represent the validity of simulation results.
Keywords
Sequential Gaussian simulation
variogram model
outlier
toxic elements
waste dump
Subjects

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  • Receive Date 21 February 2019
  • Revise Date 27 December 2019
  • Accept Date 14 December 2019