Glencore (LSE:GLEN) closed 2.8% lower on Tuesday as copper slid to a seven-week low, oil stayed volatile and the FTSE 100 suffered its steepest one-day fall in a month.

What happens to a company that mines, processes and trades a wide range of commodities when several of those markets turn lower at once? Tuesday 3 November offered a fresh answer. Glencore (LSE:GLEN) fell 2.8%, according to Reuters, as a metals sell-off spread through the London market and helped knock the FTSE 100 off its recent winning streak.

The Blue-Chip index closed at 10,638.43, down 122.90 points or 1.14% from Monday's close of 10,761.33. That ended a run of four straight sessions of gains and marked the steepest daily drop in a month. The FTSE 350 basic resources index, which gathers the large and mid-sized Mining groups, fell 2.6%.

Glencore made no company-specific announcement in the material behind this article. Its decline reflected the mood across the commodities complex, where copper, oil and precious metal shares all came under pressure.

Copper leads the way down

The main trigger for mining weakness was copper. Midday reports from Reuters, carried by Share Talk, said the metal had reached seven-week lows, pushing industrial metal miners to their weakest level in almost four months. Alliance News reported that copper fell 2.5% over the day.

Copper sits among the most closely watched industrial metals, because it is used heavily in electrical wiring, power networks, construction and vehicles. When investors grow more cautious about economic activity or about the cost of borrowing, expectations for copper Demand can soften. That is a general relationship rather than a full account of Tuesday's move, and the fact sheet used here does not attribute the drop to any single cause.

Glencore's fall of 2.8% was close to copper's reported 2.5% decline and the basic resources index's 2.6% loss. By comparison, Antofagasta (LSE:ANTO), a more copper-focused producer, fell 3.5%, while Anglo American (LSE:AAL) was down about 2.8% at midday. The relative size of those moves fits a broad pattern in which companies with wider Commodity portfolios can sometimes be cushioned slightly compared with more concentrated producers, although on any given day many other factors are at work.

The oil factor

Glencore's Business stretches beyond metals into energy, and Tuesday's energy markets were anything but calm. Crude slid about 2% on Tuesday in volatile trading, according to Reuters, after a fall of roughly 7% on Monday. Investors were weighing talks aimed at ending the wars in Ukraine and Iran.

The numbers from Monday were striking. Brent Crude settled at $104.77 a barrel, down $8.66 or 7.63%, while West Texas Intermediate settled at $96.46, down $7.66 or 7.36%. Early on Tuesday, in Asian trading, Brent rose to about $105.25 after The Wall Street Journal, citing US officials, reported a US strike on Iran's Qeshm Island. The officials described the strikes as defensive, intended to stop Iran attacking commercial ships in the Strait of Hormuz.

Tim Waterer, chief market analyst at KCM Trade, said: "The report added a degree of risk premium back into the oil price." That risk premium did not hold through the day, however, and crude ended lower. For a group with exposure to both metals and energy, a day on which copper and oil weakened together left little room for one part of the portfolio to offset another.

Iran said contacts with Washington were continuing, while Qatari-mediated talks ended without a breakthrough. Before the conflict began in late February 2026, roughly one-fifth of the world's Crude Oil and Natural Gas shipments passed through the Strait of Hormuz, which helps explain why any news from the region can move prices sharply.

Rates, Inflation and nervous markets

Behind the commodity swings sat a wider concern about inflation and interest rates. Reuters noted that elevated oil prices have fuelled inflation fears and that many central banks have raised rates. In the UK, the Bank of England's Monetary Policy Committee announces its decision on Thursday 5 November, with a 25 basis point rise from 3.75% to 4% widely expected. That would be the first increase since August 2023.

Banks also weighed on the FTSE 100 on Tuesday. The FTSE 350 banks index fell 1.6%, and HSBC (LSE:HSBA), down 2.0%, was the biggest approximate drag on the index in points terms. Selling deepened in the afternoon: the index stood at about 10,705 early in the session and around 10,687.72 at midday before closing at 10,638.43.

For illustration, a hypothetical Glencore holding worth £2,000 at Monday's close would have fallen by £56, to £1,944, on a 2.8% decline. The example simply shows the arithmetic of a one-day move and implies nothing about what comes next.

Large mining groups carry significant weight in the FTSE 100, so a broad commodity sell-off tends to show up quickly in the headline index. Index weighting in the FTSE 100 is based on market value, which means a big company falling by a given percentage removes more points than a smaller one falling by the same amount. That is one reason the basic resources sector so often sets the tone for the whole market on days like Tuesday.

Key dates to watch

Wed 4 Nov:Eurozone inflation figures, expected at 3.9%.

Thu 5 Nov:Bank of England MPC decision; a 25bp rise to 4% is widely expected.

Fri 6 Nov:US October jobs report.

Fri 6 Nov:IAG Q3 results, a test for oil-sensitive stocks.

Thu 12 Nov:ONS first quarterly GDP estimate for July–September 2026, at 7:00am.

The bottom line

Glencore's 2.8% fall on Tuesday was a story of several commodity markets moving against it at once. Copper hit a seven-week low, oil swung between a geopolitical risk premium and hopes for peace talks, and the inflation and interest-rate backdrop kept investors cautious. Its decline tracked the broader basic resources sector rather than standing out from it. With a Bank of England decision, US jobs data and UK growth figures all due within days, the forces that pushed Glencore lower are likely to stay firmly in view for FTSE 100 observers.