State-of-The-Art-Technology in Ore Mining
The "cut-off grade", i.e. the minimum level at which mined ore is still worth processing, is currently at 22.0 % Fe which amounts to 25 % of siderite and ankerite. Ore with a ferrous content of above 30 %, which corresponds to approximately 55 % siderite aggregate material, is called ‚finished ore' (about 1 million tons/year).
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