Prakash, A. and Singh, K.B. and Kumar, Ajay (2015) Pot-Hole Subsidence Potentiality in Nongtrai limestone Mine of Lafarge Umium Mining Private Limited, Shillong, Meghalaya. International Journal of Mining Science, 1 (1). pp. 10-16.

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Abstract

The Nongtrai limestone mine of Lafarge Umiam Mining Private Limited (LUMPL) is located in the East Khasi Hill district of Meghalaya. Limestone terrain is prone to solution features such as pot-holes. Potentiality of pot-hole subsidence occurrence is assessed based on site history, climatic condition in terms of rainfall, intact rock property and ground water of the area. There are past cases of two pot-holes around 20 m down the southern side of the mining lease boundary. The mine is close to Cherrapunjee Mawsynram belt and therefore the average annual rainfall ranged from 2000 to 5000 mm. The rock type is highly jointed and fracture in nature. The thickness of the top limestone varied from 100 to 200 m. The existence of void in the form of cavity or open fractures is studied in accordance with borehole data and Ground Penetrating Radar (GPR) survey. Pot-hole prediction is evaluated based on ratings of depth of cover, weak overburden, geological discontinuities and water seepage. Mitigative measures are also suggested for safety during mining operation.

Item Type:	Article
Uncontrolled Keywords:	pot-hole, rainfall, limestone, groundwater, voids
Subjects:	Mine Subsidence
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	07 Sep 2015 10:54
Last Modified:	07 Sep 2015 10:54
URI:	http://cimfr.csircentral.net/id/eprint/1517

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