The most-actively traded September iron ore contract on the Dalian Commodity Exchange rose as much as 3.9pc to 796 yuan ($115) a tonne, on course to end the week with a gain of around 12pc. That was the highest mark for the Chinese benchmark since Dalian iron ore futures started trading in 2013.
Some analysts say there is still no end in sight to the steel raw material's red-hot rally that began shortly after the catastrophic collapse of a tailings dam of miner Vale SA in Brazil in late January.
Safety concerns have prompted closures of other Vale mines this year as well, reducing supply to top buyer China, which makes about half of the world's steel.
Imported iron ore inventories at Chinese ports have declined to 121.6 million tonnes as of last week, the lowest since early 2017, data compiled by SteelHome consultancy showed.
"Supply losses in Brazil look structural, leaving the market undersupplied until 2020," ANZ analysts said in a note. "Attractive steel margins amid stronger infrastructure spending in China bodes well for demand."
On Thursday, China Vice Premier Liu He sought increased support for the economy and ample liquidity in the financial system, suggesting Beijing would soon unveil more policies to bolster growth amid rising US trade pressure.
"China has a firm policy to maintain growth, almost at any cost," analysts at SP Angel in London said in a note. Beijing is ramping up stimulus to support the economy hit by United States' anti-dumping measures and higher tariffs, they said.
Spot iron ore prices have also resumed their climb, with the benchmark 62pc grade for delivery to China hovering near a five-year high at $107.50 a tonne on Thursday, up from $104.50 the previous day.
The rest of China's ferrous complex was mixed on Friday, with other steelmaking raw materials lower while steel futures edged higher.
Coking coal was down 0.3pc at 1,397 yuan a tonne as of 0251 GMT. Coke slipped 0.6pc to 2,122 yuan.
The most-actively traded October construction steel rebar contract on the Shanghai Futures Exchange was up 0.2pc at 3,782 yuan a tonne. Hot rolled coil, used in cars and home appliances, gained 0.6pc to 3,644 yuan a tonne.