Informatics Publishing Limited

D. S. Rao , B. P. Singh

Abstract

The present study of wastage of timber at tree harvesting stage in South India reveals an avoidable wastage of about 6% of the volume of tree. Reduction in wastage by use of proper tools of IS standards and their proper maintenance along with training of staff and workers in Basic Logging Techniques with co-operation of Forest Department and Corporations is absolutely essential.

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B. C. Acharya ¹, D. S. Rao ¹, R. K. Sahoo ¹

Affiliations
1 Regional Research Laboratory, Bhubaneswar 751013, IN

Abstract

Manganese ores of Nishikhal occur as distinctly conformable bands in the khondalite suite of rocks. Presence of phosphorus, iron and silica beyond desirable limit in most of the ores makes them unsuitable for industrial purposes. The dominant ore minerals are psilornelane, cryptomelane, pyrolusite and goethite. These ores are formed by supergene enrichment of primary syngenetic metamorphosed assemblages. Phosphorus is present as a discrete mineral phase in the form of apatite contained in the silicate minerals, as well as fixed in the crystal structure of goethite, cryptomelane and psilomelane. Physical beneficiation may be employed to remove the silicate minerals which will ultimately reduce a part of phosphorus. Removal of iron by this method may be difficult because of the fine grain-size and complex intergrowth with goethite.

Keywords

Economic Geology, Manganese, Koraput, Orissa, Khondalite.

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D. S. Rao ¹, B. C. Acharya ¹, R. K. Sahoo ¹

Affiliations
1 Regional Research Laboratory (CSIR), Bhubaneswar-751013, IN

Abstract

No Abstract.

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D. P. Tripathy ¹, D. S. Rao ¹

Affiliations
1 Department of Mining Engineering, National Institute of Technology, Rourkela, Odisha-769008, IN

Abstract

This study aimed to produce a noise map by determining the noise levels in the different parts of the highly mechanized coal mine and to compare them with the Directorate General of Mines Safety (DGMS) prescribed permissible limits. A total of 497 Global Positioning System (GPS) variables were collected from the mine at varying intervals according to the International Organization for Standardization (ISO) and DGMS guidelines to measure sound pressure levels (SPL). The GPS receiver interfaced with the real time octave band analyzer allowed simultaneous measurement of noise levels and their GPS data. Measured information with GPS variables were exported to ArcGIS software for generating the noise map. Results showed that noise levels were higher than the permissible limits in most parts of the mine, the maximum and minimum average noise levels being were 102 dB (A) and 54 dB (A), mean equivalent A-weighted sound pressure level (L_Aeq) was 73±7.3 and L_Aeq were ranging between 81-93 dB (A) of drilling, dozer, loader & silo, 71-80 dB (A) at workshop & shovel working locations, 61-70 dB (A) at various haul roads, siding & dump yard locations, and 50-60 dB (A) at roads respectively. The results suggest that interpolating noise levels with GPS variables can enhance the visualization of the noise map and has the potential to be more effective at informing policy decision-making, and actions to be taken as a result of high noise levels.

Keywords

Noise Pollution, Noise Mapping, Equivalent Sound Levels, Coal Mine, ArcGIS, GPS.

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