Iron Ore Lump
Coarse, naturally sized iron ore, roughly 6-31mm, that can be charged directly into a blast furnace without further processing — usually priced at a premium to fines.
Covered in 1 MetalsCost.com News Intelligence article, most recently on August 8, 2026.
Overview
Iron ore lump is coarse, naturally sized ore — typically pieces ranging from around 6 to 31 millimetres — that's been screened and washed but not crushed down into fine particles or bound into pellets. It's essentially the ore in its more natural physical state, as opposed to fines, which are the smaller particles left over from the same mining and screening process.
Why Lump Commands a Premium
Lump ore's main advantage over fines is that it can be fed directly into a blast furnace without any further agglomeration step, whereas fines generally need to be sintered — heated and fused into small clumps — or pelletized before a blast furnace can use them efficiently. Skipping that extra processing step saves steelmakers both cost and time, which is why lump ore typically sells at a price premium over fines of equivalent iron content, even though the two come from the same mines and often the same ore body.
That premium isn't fixed, though — it moves with the relative supply of lump versus fines coming out of a given mine (lump is naturally the smaller share of most ore bodies), and with how much sintering capacity steelmakers in the buying market have available, since a steel industry with ample sintering capacity has less need to pay up for lump's processing shortcut.
Role in Steelmaking
Because lump ore goes straight into the blast furnace, it plays a particularly direct role in a steel mill's day-to-day operations and cost planning, and miners like NMDC list lump and fines as separate line items with their own prices precisely because steelmakers manage them as distinct inputs with different processing needs and different roles in the furnace charge.
