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3 Journal of Sustainable Mining

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Evaluating the post-mining land uses of former mine sites for sustainable purposes in South Africa

Mhlongo Sphiwe E.

Journal of Sustainable Mining

2023

Vol. 22. iss. 2

110--127

This paper uses a case study of an abandoned magnesite mine in the Limpopo Province of South Africa to ﬁnd ways of identifying post-mining land used from the current uses of the abandoned mine sites or features. The approach used involved carrying out a ﬁeld characterization of the mine site and documentation of the current uses of the features of the abandoned mine site. The technique used to identify the internal and external factors of the land uses involved analyzing their Strength, Weakness, Opportunities, and Threats. The Analytic Hierarchy Process (AHP) technique was used for further ranking of the land uses to identify the most post-mining or rehabilitation land uses for the different parts of the mine. Lastly, the earthwork requirement in reshaping the terrain of the mine to support the selected land uses was estimated from the 3D-terrain models generated from height data collected using a Real-Time Kinematic Geographical Positioning System. The results of the study identiﬁed land use that needs further surface development as the most appropriate for the abandoned Nyala Mine. These land uses demonstrated the potential of addressing the hazards of the mine with the clear promise of improving the socio-economic status of the host communities.

Natural radionuclides (NORM) in a Moroccan river affected by former conventional metal mining activities

Manjón Guillermo, Mantero Juan, Vioque Ignacio, Díaz-Francés Inmaculada, Galván José Antonio, Chakiri Said, Choukri Abdelmajid, García-Tenorio Rafael

Journal of Sustainable Mining

2019

Vol. 18, iss. 1

45--51

The main aim of this work was to determine the levels of multiple natural radionuclides in an aquatic system (Moulouya river, Morocco) impacted by multiple abandoned Zinc and Lead mines. 238U, 234U, 232Th, 230Th and 210Po were determined by alpha-particle spectrometry in water and sediment samples collected along the river and in samples from three pit lakes of abandoned mines, located in the Upper Moulouya catchment area. The results enabled the analysis of the different levels of impact of former mining activities, depending on the natural radionuclides. While the activity concentration of U-isotopes in Moulouya river water was slightly elevated in the vicinity of abandoned mine wastes, other natural radionuclides (Th-isotopes and 210Po) levels were typical of a natural environment. This fact is clearly reflected in the magnitude and range observed in the distribution coefficients for the different radionuclides analyzed.

Evaluation of pre-jamming indication parameter during blind backfilling technique

Panda S., Pal S. K., Murthy P. V. S. N.

Journal of Sustainable Mining

2016

Vol. 15, iss. 3

100--107

Hydraulic blind backfilling is used to reduce subsidence problems above old underground water-logged coal mines. This paper describes experimental research on a fully transparent model of a straight underground mine gallery. An automatic data acquisition systemwas installed in the model to continuously record the sand and water flowrates along with the inlet pressure of the slurry near the model's inlet. Pressure signature graphs and pressure loss curves with bed advancement under different flow conditions are examined. Pressure signature analyses for various flowrates and sand slurry concentrations are conducted to evaluate a pre-jamming indication parameter, which could be used to indicate the arrival of the final stage of filling.