Non-Ferrous Metals: Fed Decision Triggers Rebound, But Divergence Remains
The non-ferrous metals market has had a volatile week. Prices got hammered on July 28, then bounced back two days later. The trigger was the Federal Reserve’s interest rate decision.
On July 28, London Metal Exchange base metals all closed lower . Three-month copper dropped to $13,644.50 per ton, down 0.84 percent. Nickel took a bigger hit, falling 1.88 percent to $16,945. Aluminum shed 0.77 percent, zinc fell 1.31 percent, and tin dropped 1.79 percent . The selloff was broad and consistent.
What drove it? The Fed. Expectations for a July rate hike had been building all month. By July 28, the market was pricing in about a 30 percent chance of a 25-basis-point hike . That sent the dollar index to a one-month high. For metals priced in dollars, a stronger dollar makes them more expensive for foreign buyers. The move was systematic. According to analysts, the macro-level pressure completely overwhelmed the supply-side positives. Even though LME inventories were mostly low and geopolitical risks remained, investors were focused on the Fed. They chose to wait on the sidelines.
A trader I spoke with in Singapore said the market was nervous. “Nobody wanted to get caught on the wrong side of a Fed surprise. Everyone was just waiting.”
July 30 brought the decision. The Fed held rates steady. But the vote was not unanimous. Three officials still voted for a hike . That split tells you something about the uncertainty in the room.
The outcome triggered a rebound. On July 30, LME base metals were broadly higher . Copper climbed 1.30 percent to $13,798.50. Tin led the way, up 2.52 percent to $55,205. Nickel rose 1.02 percent to $17,315. Aluminum gained 0.52 percent to $3,193. Zinc added 1.02 percent . The only loser was lead, down 0.18 percent, because it is still sitting on historically high inventory.
The biggest driver of the rebound was the dollar. It weakened sharply after the Fed announcement. A weaker dollar supports metal valuations across the board.
But the market is not unified. Aluminum has an extra layer of support. Middle East supply risks are back in the picture . Some analysts are calling it the “geopolitical supply risk premium.” And it is real.
Here is why. The Strait of Hormuz has been disrupted. The Middle East supplies about 24 percent of the world’s sulfur. Since the conflict escalated, sulfur exports have essentially stopped. About 800,000 to 1 million tons of sulfur are sitting idle. Chinese ports have seen sulfur arrivals drop to zero. Port stocks fell from about 2 million tons at the end of 2025 to 760,000 tons by mid-June.
Sulfur is critical for nickel and copper processing. Without it, production costs rise. Some smelters may have to cut output.
Meanwhile, the Middle East supplies about 9 percent of global aluminum . That supply has been disrupted. The result is that aluminum inventories are draining. LME aluminum stocks fell below 270,000 tons this week, the lowest level since 1998 . Chinese social inventories also continue to draw down. But analysts caution that the pace of destocking may slow in August and September as seasonal patterns shift.
Copper has its own dynamic. The US copper tariff threat is back in focus. The Commerce Department is expected to deliver a report by June 30 recommending whether to impose tariffs on refined copper imports. The market expects a staged tariff: 15 percent starting in 2027, rising to 30 percent in 2028.
The result? COMEX and LME copper prices are diverging again. In May, the spread hit $400 to $500 per ton. At one point, more than 50,000 tons of copper were taken out of LME warehouses in a single day and sent to the US . That was the largest single-day withdrawal since 2013. It shows the market is front-running potential US tariffs.
The medium-term outlook for copper remains tight. Copper concentrate treatment charges are still deeply negative. Miners are paying smelters to take concentrate. That is a classic sign of supply stress. At the same time, the global copper supply deficit could hit 25 percent by 2035, according to the International Energy Agency.
A procurement manager at a Chinese cable maker told me he is watching the tariff situation closely. “If the US really goes to 30 percent, the global copper flow will have to reconfigure. That will affect everyone.”
The minor metals space is telling a different story. Three core minor metals — tin, tantalum, and indium — have all posted big gains in the first half of 2026. Tin is up over 40 percent, tantalum over 158 percent, and indium over 60 percent . The driver is AI. These metals have irreplaceable applications in servers, high-speed optical modules, and advanced packaging. Cloud providers are still expanding AI capex.
A source at a Shanghai trading firm said the minor metals space is where the real action is. “Copper and aluminum are supply stories. But tin and indium are demand stories. And AI demand is only going one direction.”
The non-ferrous metals market is clearly in a moment of transition. The immediate macro pressure from the Fed is easing, at least for now. But the uncertainty around US tariffs, Middle East supply disruptions, and global growth keeps the market on edge.
For buyers, the message is mixed. Copper and aluminum supply constraints are real and persistent. But demand is seasonally weak, with summer construction and manufacturing activity slowing. The standoff between cost support and demand weakness is the dominant theme right now.
One thing is clear: the old patterns are breaking down. Metals no longer move in lockstep. Each metal has its own supply story, its own demand driver, and its own exposure to geopolitical risk. Buyers who treat non-ferrous metals as a single category are going to miss the nuance. The ones who pay attention to individual metal fundamentals will be better positioned for the months ahead.