BHP (ASX:BHP), Rio Tinto (ASX:RIO) and the Miners Lead the ASX Higher

The big miners powered the ASX higher on Monday, with the Materials sector up 3.8% to lead all eleven sectors. BHP (ASX:BHP) climbed about 3.6% to a fresh record high of A$65.18, while Rio Tinto (ASX:RIO) rose 2.7%. The reason was simple. The weekend US-Iran deal pushed commodity prices sharply higher, and the ASX is packed with the miners that gain the most when that happens.

Why the Miners Surged

When commodity prices go up, the big Australian miners go up with them. That is exactly what happened on Monday.

The US-Iran deal calmed global markets and lifted hopes for stronger demand. Copper rose about 1.1%, gold jumped around 2.5%, and iron ore held above US$100 a tonne. Iron ore and copper are the main earners for BHP and Rio Tinto, so when those prices rise, the companies are expected to make more money, and their share prices follow.

There was a second helping hand, too. Australian government bond yields fell to around three-month lows. When yields fall, shares usually look more attractive by comparison. Put a calmer global mood and cheaper oil on top of that, and you get the kind of upbeat day where the heavyweight miners do most of the heavy lifting for the whole market.

Why This Matters for the ASX

The miners are not just any stocks. BHP and Rio Tinto are among the biggest companies on the ASX, so when they jump, they pull the whole market up with them. That is why a strong day for materials usually means a strong day for the ASX 200.

Monday’s move pushed the broader index back towards record territory. BHP setting a fresh all-time high is a meaningful signal. It shows investors are happy to pay up for mining earnings right now, helped by a brighter outlook for global growth and commodity demand.

It also helps that the rally was broad. Beyond the two giants, smaller base metals and gold miners also posted strong gains. That suggests the move came from genuine optimism across the whole sector, not just one or two names. Broad rallies tend to be healthier than narrow ones.

What Investors Should Watch

Here is the honest caution. Miners live and die by commodity prices, and those prices can turn fast. Monday’s gains depend on the Iran deal holding and on commodity strength lasting. If the deal wobbles or Chinese demand softens, iron ore and copper could give back some of these gains just as quickly.

China is the key thing to watch. As the world’s biggest buyer of iron ore, even small changes in Chinese steel production or building activity move the price, and BHP and Rio Tinto move with it. Some analysts have already flagged the risk of weaker iron ore prices later in 2026 if global supply rises.

The simple view: Monday’s surge reflects a real improvement in the commodity backdrop, and the miners earned their gains. But these are cyclical stocks sitting at high levels, so it pays to watch the commodity prices behind the rally, not just the share prices.