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Mishra, R. N.
- Geology of the Jensurigudda Iron Ore Deposit of Chickmagalur District, Mysore
Authors
1 Sandur, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 13, No 4 (1972), Pagination: 373-381Abstract
The Jensurisudda Iron ore deposit is one of the prominent iron ore occurrences in the Bababudan hills of Mysore State belonging to the 'Bababudan Series' of Dharwarian age.
The formation consists of bedded hematite and limonite resting over ferruginous shale with lenses of quartzites. The structure is a major fold with axis trending NNWSSE. The harder rocks viz. the quartzites and the ores display innumerable irregular folds. Structural control or localisation is present in a broad sense. Harder or lumpy ore overlies softer ore and blue dust. The ore body extends to a depth of 20 metres. It is inferred that the ferruginous shales are the source rocks for ore formation and that the concentration has been achieved through 'lateritic weathering'.
- Chitradurga Metallogeny - A Case Study for Regional Metallogenic Analysis
Authors
1 Geological Survey of India, Karnataka Circle, Jayanagar Shopping Complex, Bangalore 560011, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 26, No 8 (1985), Pagination: 599-606Abstract
Chitradurga schist belt has traditionally been accepted as a long and narrow curvilinear Archaean geosynclinal pile, cratonised long ago. Important economic minerals are gold ore at Gadag, Bellara, Ajjanahalli and Honnemaradi; antimony at Chikkanayakanahalli; copper-lead-zinc and pyrite at Ingaldhal; iron and manganese ores at the western margin of the belt; limestone and dolomite around Dodguni, Chikkanayakanhalli and Javanahalli; barytes and fuchsite quartzite around Ghattihosahalli.
Salient features of the zonation of metals and minerals show a trend from the central to peripheral areas in the belt:
Cu, Pb, Zn, Pyrite → Au, Ag, Sb, As → Fe, MD, Carbonates → Barite, Fuchsite Quartzite, Kyanite → Feldspar, Quartz, Corundum.
The appropriate name for the container of this varied mineral spectrum across the time and space concept, could be 'metallogen'. The significant features of mineral zones in the Chitradurga metallogen; could prognostically lead to search for ore and the speculative size-up of the mineral in a futuristic perspective, thus forming a basis for a Resource Base. Regional metallogenic analysis thus opens up new vistas for future mineral appraisals. Chitradurga metallogen could thus form a subject for case study.
- Geology Around Pokharan Nuclear Sites
Authors
1 Geological Survey of India, Nagpur, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 52, No 3 (1998), Pagination: 364-364Abstract
No Abstract.Full Text
- Exploration Planning for Sandur Manganese Ores
Authors
1 Geological Survey of India, 78, Diagonal Road, Jayanagar III Block, Bangalore-560011, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 19, No 10 (1978), Pagination: 446-453Abstract
Three prevailing ore types viz., stratiform, podiform and tabular deposits occur at the incidence ratio of 75:6:19. The stratiform orebodies can be designated as plenemensurate and regular; the podiform types as partimensurate and complicated; and the tabular ones as extramensurate and irregular.Based on the study presented here, a stratiform body may be explored on 100m × 100m square grid by core-drilling for the results to remain within the confidence level of ±20%; while pediform bodies may be explored with jack hammer-cum-diamond drilling at 50m × 50m square grid and the tabular deposits at 20 m × 20m square grid with deep pits-cum-drilling for the results to remain at the same level of assurance.