Overview
| Stage | Production |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Processing |
- Crush & Screen plant
- Flotation
- Magnetic separation
|
| Mine Life | 2040 |
Source:
Created in 2015 from the merger of the mining assets of CSN and Namisa, CSN Mineração S.A. is divided between CSN (79.141%) and a consortium of major Asian steelmakers (9.081%).
CSN Mineração SA started to centralize CSN’s mining operations, including the establishments of the Casa de Pedra mine, the TECAR port and an 18.63% stake in MRS. CSN’s interest in this subsidiary is 79.141% as on 03/09/2021
Summary:
Casa de Pedra mine is a hematite-rich iron deposit of an early proterozoic banded iron formation in Brazil’s Iron Ore Quadrangle (Quadrilátero Ferrífero), which is located in the central part of the state of Minas Gerais in the Southeastern region of Brazil.
Summary:
Casa de Pedra is an open pit mine located in the city of Congonhas, in the state of Minas Gerais, approximately 80 km south of the city of Belo Horizonte and 360 km north of the city of Rio de Janeiro.
Iron ore at Casa de Pedra is currently excavated by a fleet of hydraulic shovels and wheel loaders and then hauled by a fleet of trucks with an installed annual run of mine capacity of approximately 120 million tons.
The extraction of iron ore begins with the drilling of rocks. Explosives are then placed into the rocks for fragmentation.
Excavators and wheel loaders remove iron ore from Casa de Pedra and dump it onto off-road trucks, which transport the ore to the crushing facilities. Overburden removed is transported to special piles distributed across the mine.
Processing
- Crush & Screen plant
- Flotation
- Magnetic separation
Source:
Summary:
The iron ore is processed in treatment facilities, which have an installed capacity of 33 million tons of products per year (a sum of the central plant, mobile plants and Pires treatment facilities).
Casa de Pedra mine supplies all of iron ore needs, except pellets, and produces lump ore, sinter feed and pellet feed fines with high iron content.
Casa de Pedra’s treatment facilities have an installed annual run of mine capacity of approximately 40 million tons.
Recoveries & Grades:
| Commodity | Parameter | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|
Iron Ore
|
Recovery Rate, %
| ......  | ...... | | 77.9 | | |
|
Iron Ore
|
Concentrate Grade, %
| ...... | ...... | 62.5 | 62.1 | 63.1 | 63.8 |
Production:
| Commodity | Units | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|
Iron Ore
|
kt
| ...... | ...... | 23,400 | 26,050 | 29,460 | 26,240 |
All production numbers are expressed as concentrate.
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Operational Metrics:
| Metrics | 2020 | 2019 | 2018 | 2017 |
|
Annual mining capacity
| ...... | 120 Mt | 103 Mt | 103 Mt |
|
Annual production capacity
| ...... | 33 Mt of iron ore concentrate | 33 Mt of iron ore concentrate | 33 Mt of iron ore concentrate |
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Reserves at December 31, 2020:
The cutoff grade value for Casa de Pedra mine considered in the most recent audit is 23.37%.
| Category | Tonnage | Commodity | Grade | Contained Metal | Recoverable Metal |
|
Proven
|
1,043 Mt
|
Iron
|
41.36 %
|
830 Mt
|
|
|
Probable
|
1,662 Mt
|
Iron
|
41.36 %
|
1,662 Mt
|
|
|
Proven & Probable
|
2,492 Mt
|
Iron
|
41.36 %
|
2,492 Mt
|
1,375 Mt
|
Commodity Production Costs:
| | Commodity | Units | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 |
|
Cash costs
|
Iron Ore
|
USD
|
......
|
14.6 / t
|
15.8 / t
|
12.9 / t
|
15.6 / t
|
24.7 / t
|
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Aerial view:
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