NANDIHALLI IRON ORE MINE
Name of the Owner: M/s Bharat mines And Minerals
The mine is situated in Nandi Halli village, Taluk- Sandur, District- Bellary in the state of Karnataka. The mine is about 16 KM from Sandur Town, a Taluk Head Quarter and about 75 KM from Bellary District Head Quarter. The nearest Railway Station on Broad gauge line, Ranjit Pura is at a distance of 5 KM from the mine. Total lease hold area of the mine is about 26.20 Hectares and the validity of the lease is upto 05-04-2021. The average daily production is about 2000 tonnes employing about 30 persons of company and about 8 persons of contractor per day.The Bellary-Hospet deposit are one of the four major known concentrations of high grade Hematite ore in India, the other three being Bara-Jamada in Jharkhand-Orissa border, Dalli-Rajhara-Rowghat-Bailadila in M.P.-Chhatisgarh and Goa-Redi deposits in Goa. The Bellary-Hospet region forms a part of the ‘Sandur Schist belt’ referred as the ‘Dharwars’ a group of Pre-Cambrian Schistose rocks of Mysore. The Lithological units include green stones which are the metamorphosed basic igneous rocks occupying the valley regions. The general sequence of the rock formation found in the area is given below-
Soil Mixed with Iron Ore Float
Banded Hematite Quartz
Iron Ore zone
The general strike direction of the formation is North West- South East. The total strike length of the ore body was 750 meter and the width of the Ore varies from 20 meters to 35 meters. In the center of the ore body is a huge Banded Hematite Quartz band running to a length of about 240 meters. The dip amount is about 72° towards North-East. Footwalls as well as Hanging Walls were of Phyllites. Top of the ore body was covered by Laterite to a depth varying from 5m to 12m. The quality of Iron Ore is not consistent but varies from 61%-68%.
The mine is being worked by mechanized open cast method. The over burden is being removed by Shovel and loaded into the tippers and total ROM was being transported to Crushing and Screening Plant. Once in a week, deep-hole drilling and blasting is being carried out for excavation of Iron Ore and removal of ROM in the working face. Drilling and blasting were required only for 20% and balance 80% of ore quantities are being removed with the help of Hydraulic Excavator without using drilling and blasting. Only 15-20 holes (100mm Dia.) per week are blasted in the mine and in one round about 250-300 Kg of explosives are used. Total ROM (consisting of about 60% of Fines -10mm size and 40% of Lumpy Ore +10mm) is being sent to Crushing and Screening Plant install at the foot of the hill which is having a rated capacity of 150 ton/hour. Finally, the crushed material is transported contractually to railway siding at Ranjit Pura and partly supplied to local steel plants.
Following heavy earth moving machineries were being used in the mines-
|(i) Hydraulic Excavators – 1.2 m 3 bucket capacity, 9m boom height||05|
|(ii) Wheel Loader/Front End Loaders – 1.8 m 3 bucket capacity||01|
|(iii) Hydraulic Rock Breaker||01|
|(iv) Drilling machine, Atlas Copco, 110mm Dia. DTH||01|
|(v) Tippers, 10 ton capacity||20|
|(vi) Water Tankers, 20,000 Ltrs. Capacity
10,000 Ltrs. Capacity