Iron ore prices rallied on Friday, supported by renewed uncertainty over Brazilian and Australian supply.

According to metal Bulletin, the spot price for benchmark 62% fines jumped 2.5% to $86.81 a tonne, logging its largest gain in two weeks.

The gains in higher grades were even larger with 65% fines soaring 3% to $99.30 a tonne, leaving it just below the multi-year highs struck in early February.

Lower grades also rallied with 58% fines adding 1.6% to $72.14 a tonne.

The across the board gains coincided with renewed uncertainty over the outlook for Brazilian and Australian iron ore supply, two of the largest seaborne exporters globally.

On Thursday, Brazilian miner Vale lowered its iron ore sales forecasts to a range of 307 to 322 million tonnes this year, down from an earlier estimate of 382 million tonnes.

“The price implications from Vale’s guidance and commentary are significant,” said Vivek Dhar, Mining and Energy Commodities Analyst at the Commonwealth Bank.

“Given the physical nature of iron ore markets, the impending physical tightness to face iron ore markets strengthens our conviction that iron ore prices will rise above to over $90 a tonne in the short term.”

Daniel Hynes, Senior Commodities Strategist at ANZ Bank, is another who expects iron ore prices will remain supported in the period ahead.

“We see a sizable disruption lingering over the market for the near future,” he said, referring to supply disruptions in Brazil.

“Supply-side responses are likely, but will be far short of what is required to meet the needs of the market in 2019. As a result, iron ore exports will fail to meet expected demand by around 35–40 million tonnes in 2019.

“This should keep prices well supported in 2019.”

Along with uncertainty over the outlook for Brazilian supply, news of operational disruptions at facilities owned by Rio Tinto in Western Australia was another factor that helped to propel prices higher during the session.

On Friday, the miner issued force majeure notices to some iron ore customers due to damage from tropical cyclone Veronica, which hit Western Australia earlier this week, according to Reuters.

Rio said that it was “currently assessing the impact of the damage sustained at the Cape Lambert A port facility and is working with its customers to minimise any disruption in supplies”.

A force majeure is invoked when a miner cannot perform an obligation under a contract due to circumstances outside of its control.

Like spot markets, the news helped to spark a rally in Chinese iron ore futures on Friday.

In Dalian, the most actively traded May 2019 contract jumped to as high as 638.5 yuan before closing the session at 631.5 yuan. That was well above the 613.5 yuan level it finished on Thursday evening.

Stronger steel prices also helped to support iron ore futures at the margin with rebar and hot-rolled coil finishing trade at 3,758 and 3,741 yuan respectively, up from 3,695 and 3,673 yuan on Thursday evening.

As seen in the scoreboard below, those moves were largely sustained in overnight trade on Friday.

SHFE Hot Rolled Coil ¥3,732 , 0.67%
SHFE Rebar ¥3,754 , 0.72%
DCE Iron Ore ¥632.50 , 1.85%
DCE Coking Coal ¥1,229.00 , -0.08%
DCE Coke ¥1,980.00 , 0.23%

Trade in Chinese commodity futures will resume at midday AEDT on Monday.

In news that will likely bolster sentiment across the steel and bulk commodity complex further, activity levels across China’s manufacturing and non-manufacturing sectors improved in March, driven in part by booming construction activity.

The government’s manufacturing and non-manufacturing PMIs rose to 50.5 and 54.8 respectively in March, up from 49.2 and 54.3 in February.

A reading above 50 indicates that activity levels improved from a month earlier. The distance away from 50 reveals how fast the improvement occurred.

The separate Caixin-IHS Markit China manufacturing PMI report for March will be released today. In the past, markets have tended to pay more attention to this report than the official government release.

It will arrive at 12.45pm AEDT.

This article first appeared on Business Insider Australia, Australia’s most popular business news website. Read the original article. Follow Business Insider on Facebook or Twitter.