Presentation on THRESHOLD VALUE OF IRON ORE P.Ramesh Babu (DGM-Geology) S.Manoj Kumar (SM – Ore Dressing)
CONTENTS o Iron ore formation and deposits o Distribution and occurrence o SAIL Iron ore mines overview o Captive Mines of Bhilai Steel Plant o Profile of Dalli-Rajhara Mines o Data Modeling of Dalli-Rajhara Mines o Threshold value-issues & limitations o Mineralogy of Dalli-Rajhara o Beneficiability o Conclusion o References
Goethite Magnetite Limonite Hematite
SAIL – Iron Ore Mines Overview Remaining SL. Rated Original (As on NO MINE State YOC capacity Reserves Quality Apr`2017) Iron Ore Fe% SiO2 Al2O3 1. Kiriburu Jharkhand 1964 5.5 33 27.25 62.97 3.51 2.57 2. Meghahataburu Jharkhand 1985 6.5 22.5 11.41 61.52 4.58 2.73 3. Bolani Orissa 1960 10 143.5 57.68 62.95 2.83 3.03 4. Barsua/Taldih Orissa 1960 3 74.25 30.11 61.77 2.88 3.76 5. Kalta Orissa 1966 2.5 66.8 20.68 62.50 2.97 3.26 6. Gua Jharkhand 1919 10 140.75 61.93 3.40 2.90 67.38 Manoharpur 7. Jharkhand 1907 5 966 1200 62.14 2.68 2.74 (Chiria) 301.95 62.32 7.02 1.86 93.76 8. Dalli-Rajhara Chattisgarh 1958 9 Rowghat Chattisgarh 511 63 3 511 9 2021* 14 1.5
THE VISION MINES ORGANISATION - BHILAI STEEL PLANT To ensure continuous supply of Quality Raw Materials to Bhilai Steel Plant in tune with the growth plan of Hot Metal on a sustainable basis .
BSP MINES LOCATIONS 135 5 km 275 5 km 25 km 100 0 km 198 8 km
MINING LEASES OF IRON ORE DEPOSITS BHILAI STEEL PLANT PRESENT MINING LEASE STATUS NAME OF MINERAL MINES / LEASE LEASE AREA (Ha.) VALIDITY RAJHARA MECH Iron Ore 220.42 27-Apr-2023 DALLI MECH, J/DALLI & Iron Ore 719.60 31-May-2023 KOKAN EAST DALLI MANUAL 100.00 20-Aug-2023 Iron Ore MAHAMAYA & DULKI Iron Ore 1522.67 03-Nov-2021 Deemed renewed up KALWAR (NEW) Iron Ore 938.06 to 31/3/2025 ROWGHAT Iron Ore 2028.797 22-Sep-2029
IRON ORE RESERVES & THEIR DEPLETION BALANCE INITIAL RESERVE as NAME OF MINE RESERVE Fe% SiO2 % on 01.04.2017 (MT) (MT) 40.42 64.44 5.11 RAJHARA 75.79 22.11 61.60 8.40 DALLI 118.85 11.76 58.35 10.9 JHARANDALLI 42.50 0.6 59.38 10.4 DALLI MNL 33.00 10.25 59.48 9.50 M/MAYA 23.19 DULKI (D-1) 8.62 63.26 3.95 8.62 301.95 62.32 7.02 TOTAL 93.76
PRODUCTION & DISPATCH OF IRON ORE 9000 ‘ 000 T 8000 7304 7302 7261 7000 7219 7216 7156 7172 6982 6904 6742 6000 5000 4000 2013-14 2014-15 2015-16 2016-17 2017-18(PR) PRODUCTION DISPATCH * Production & Dispatch for 2017-18 has been taken on pro rata basis on present performance level and is likely to improve
EXCAVATION OF ORE & WASTE MT 15.586 16 15 14 13.241 13 12.034 12 10.564 11 9.452 10 9 8 7.909 7.926 7 7.66 7.685 7.303 7.169 6 6.072 5 4 4.349 3 2 2.655 2.149 1 0 2013-14 2014-15 2015-16 2016-17 2017-18(PR) ORE WASTE TOTAL
Ratio ore : waste 16 15 14 13 12 11 10 9 8 7.909 7.926 7.66 7.685 7.303 7.169 7 6 6.072 5 4.349 4 3 2.655 2.149 2 1 0 2013-14 2014-15 2015-16 2016-17 2017-18(PR) ORE WASTE stripping ratio sub-grade stock
The Rajhara Iron Mine of Balod district in the Indian state of Chhattisgarh
Mining Profile (X-Sec -DMM 480 RL)
Mining Profile (X-Sec -RMM 415 RL)
Modeling – Data Analysis CATEGORY TONNES RFE RSIO2 RAL2O3 [Waste] >55 19483498 62.86 6.77 1.76 >45 22627495 61.20 8.83 1.97 20700900 >35 23129770 60.79 9.38 1.99 20198626 >55 37383256 65.34 4.03 1.15 >45 40771569 64.09 5.33 1.32 2701875 >35 42609725 63.09 6.54 1.39 863719 >55 8845975 61.02 7.46 2.26 >45 11891805 58.44 10.71 2.67 5917518 >35 12195498 58.02 11.26 2.71 5613826
Quality Profile 70.00 60.00 50.00 40.00 30.00 20.00 10.00 0.00 2010-11 2011-12 2012-13 2013-14 2014-15 2015-16 2016-17 2017-18 Fe %(R) SiO2%(R) Al2O3%(R) Fe %(L) SiO2%(L) Al2O3%(L) Fe %(F) SiO2%(F) Al2O3%(F) Fe %(S) SiO2%(S) Al2O3%(S)
Quality Profile(Fe & SiO2)) 70.00 60.00 50.00 40.00 30.00 20.00 10.00 0.00 2010-11 2011-12 2012-13 2013-14 2014-15 2015-16 2016-17 2017-18 Fe %(R) SiO2%(R) Fe %(L) SiO2%(L) Fe %(F) SiO2%(F) Fe %(S) SiO2%(S)
PURPORT
"Rule 12(7)-Indian Bureau of Mines shall review the threshold values of minerals periodically in consultation with the stake holders." In view of the above comments and suggestions are hereby invited from all the stake holders including general public on the following aspects: 1.Inclusion or deletion of any major mineral from the list of minerals for which threshold value was notified in 2009, 2.Changes in the threshold value of the major minerals values of which were notified in 2009, with justifications,. 3.Suggested threshold value for the new major minerals proposed to be included in the list with justification.
• MINISTRY OF MINES INDIAN BUREAU OF MINES NOTIFICATION NAGPUR ,THE 16TH OCTOBER, 2009 No.T-45031/CGBM/2007(PF) • THRESHOLD VALUE OF MINERALS FOR IMPLEMENTATION • IRON ORE (i)HEMATITIC IRON ORE: 45% Fe(MIN) (ii) HEMATITIC SILICEOUS ORE (FOR ORE OF GOAN ORIGIN): 35% Fe(MIN)
"Threshold Value of minerals" means limit prescribed by the Indian Bureau of Mines from time to time based on the Beneficiability and or marketability of a mineral for a given region and a given time, below which a mineral obtained after mining can he discarded as waste."
ISSUE The mine owners are directed to comply with following. 1. All the non-saleable/un-usable minerals/ ores above the limit prescribed in the threshold values are required to be stacked separately in the area earmarked for the purpose. 2. The mineral/ ore stock above the limit prescribed in the threshold values of minerals should be properly maintained in a bound register indicating the quantity and quality of material stacked. The month wise inventory of such materials shall be updated. 3. The overburden and waste material obtained during mining operation shall not be allowed to be mixed with the materials above the threshold values of minerals stacked.
Limitations We have certain limitations like • SAIL mines in this region were started operations before 1980 ’s with large broken area out of total lease area. • Due to non availability of space ; it is very difficult to extend the area both laterally as well as vertically. • MoEF insists to backfill the existing broken area and surrender for fresh area clearances. • Hence, area for dumping of waste and sub-grade ore is major constraint in all mines.
Beneficiation Inevitability
MINERALOGICAL STUDIES – ROM Fines
MINERALOGICAL STUDIES – ROM Fines • fine size with size fractions of -1 to +12 mm with varying hues from yellow, light to deep brown, there by physically suggesting moderate iron ore mineral content. • The sample is moderately enriched in ore mineral content out of which 78% of them are ore minerals and the rest 22% is gangue content. The ore minerals include Hematite (H) and Goethite (G) and the gangue minerals are Ferruginous clay (Fcl) and Siliceous matrix ie Quartz(Q). • Hematite is ubiquitous ore mineral by its contribution up to 72% followed by scanty mounts of Goethite (G) whose contribution is approximately 6% by area of their occurrence. • Large and coarse-grained Hematite minerals do accommodate patches and medium to fine size inclusions of Ferruginous clay as well as Quartz, where as few of the coarse-grained and all most all the medium and fine size Hematite minerals do contain thin superficial coatings of Ferruginous clay matrix. • None of the ore mineral grains are seen to occur in ‘free -state ’ and all moat all the ore mineral grains either accommodate patches and/or inclusions of gangue mineral content or superficial coatings or thin layers of Ferruginous clay matrix.
MINERALOGICAL STUDIES - slimes
MINERALOGICAL STUDIES - slimes • The ore body showing characteristics of low to moderate grade ore which comprises Hematite and Goethite as ore minerals and Quartz, Pseudo Ore and Ferruginous Clay as gangue minerals. • Ore minerals distribution is around 40% as a whole and gangue minerals distribution is around 60% area as whole. • Main ore mineral is Hematite with 25% area out of which around 9% grains are in free-state and remaining 16% grains are in un- liberated state. Around 7% un-liberated grains could be liberated at 25 micron size. Remaining un-liberated grains are in less than 15 micron size. • Goethite covers around 15% area as a whole. All Goethite grains are in less than 70 micron size. Out of 15% Goethite, around 6% grains are in free-state and remaining 9% grains are in un-liberated state. All un-liberated grains are in less than 20 micron size.
MINERALOGICAL STUDIES-Summary Hematite Goethite Ferrugino Quartz(Q) Liberation (H) (G) us clay size (Fcl) 78% 22% ROM Distribution Fines 72% 6% NA Area 40% 60% Slimes 25% 15% 9% 6% 15 µ Liberated
GF Beneficiation – Process Flow Generated Fines (+8mm ) (-1mm) (+1-8mm) (Float) To Slime Unit (+0.15-1mm) (- 0.15 mm) (sink) (Non-Mags) (Mags) CB 14
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