By Tatyana Shumsky

Copper prices fell on Tuesday, after fresh losses in Chinese stocks spurred fears of wider economic problems in China, the world's top consumer of industrial metals.

The most actively traded contract, for September delivery, was recently down 10.30 cents, or 4.1%, at $2.4350 a pound on the Comex division of the New York Mercantile Exchange.

Copper prices have tumbled in recent weeks on signs that economic growth in China remained lackluster despite government efforts to boost business activity. Copper is widely used in manufacturing and construction, two sectors of China's economy that have struggled to make headway in recent months. Speculative investors have been net-bearish on Comex copper futures for four-consecutive weeks on concerns about weaker demand for the metal.

"China is 40% of consumption, and with concerns about their growth moving forward, that's keeping copper under pressure," said Dave Meger, head of metals trading at High Ridge Futures in Chicago.

On Tuesday, fresh losses in China's stock market intensified selling in copper futures, pushing prices to $2.4280 a pound, the lowest level since Jan. 29. The Shanghai Composite Index closed down 1.3% at 3727.12.

China's "stock market has become extremely volatile and growth is at its lowest in a decade," analysts at Barclays said in a note to clients. "If there is hope for commodities on the demand side, then it probably comes from the potential for the Chinese government to step up commodity-intensive infrastructure development to support growth," they said.

Some investors worry that Chinese authorities won't do enough to prevent stock-market losses from spreading into the wider economy. Many Chinese have ploughed their savings into stocks and have also taken out loans to invest additional funds in the market. As China's equities market tumbles, copper traders worry that those losses will translate into personal and financial company bankruptcies that will hurt China's overall economy.

A stronger dollar, which rallied against other currencies, also weighed on copper prices. Copper is traded in dollars and becomes more expensive for buyers who use weaker currencies to fund their purchases. The WSJ Dollar Index was recently up 0.7% at 87.90.

Write to Tatyana Shumsky at tatyana.shumsky@wsj.com

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