By Ese Erheriene And Matthew Cowley 

Metals prices plunged Monday as investors accepted that the Chinese government isn't going to provide fresh stimulus, at least for now, despite some recent signs of weakness in the world's second-largest economy.

Nickel three-month contracts traded on the London Metal Exchange fell 4.5% to $16,980.00 a ton in late afternoon trading in London, while the three-month copper contract was down 1.8% at $6,715.00 a metric ton.

Share prices in major mining companies were also down sharply Monday, led by Switzerland-based trading and mining company Glencore PLC, which was down 4.9% at GBP3.42 ($5.59). Rio Tinto shares were down 3.8% at GBP30.59 and BHP Billion PLC was off 3.5% at GBP17.31.

There are growing concerns that China, one of the largest producers and consumers of base metals, won't be able to meet its full-year growth target of 7.5%, and many investors had believed that would spur the government into action.

They had made bets that metals prices would rise, even though the Chinese government has said it wants to address the distortions in its economy, moving away from an export-driven model and toward greater domestic consumption.

Over the last week, two clear signals gave metals investors pause for thought.

First, the government provided some 500 billion yuan ($81.4 billion) to the country's top five banks, but many analysts believe this won't do much for the real economy. Second, over the weekend, Chinese Finance Minister Lou Jiwei said the government won't change its economic policies just because one piece of economic data was disappointing.

While he didn't say which data he was referring to, his comments were widely seen as a sign that the government is reluctant to provide the sort of stimulus the metals market was looking for.

"I think it's quite a surprise that they haven't done any more on the loosening side but this is pretty much what they've been telling us," said Joseph Murphy, a commodities analyst at Hermes Investment Management, which manages $400 million in commodities assets and advises on a further $1 billion. "It's come as a surprise to the market because I think they were expecting more."

The possibility of fresh action from China isn't being entirely discounted. There is still some expectation that if the economy declines at a faster pace, then the government will intervene.

"At some point if it does get materially worse from here they [the Chinese government] will step in, but at the moment I think we need to see quite a bit more weakening data," Mr. Murphy said.

A first important signal will come from Chinese manufacturing data out on Tuesday. If the PMI data dip below 50, as some analysts expect, it will be the second consecutive month of declines.

In addition to the concerns about China, the strength of the dollar has been weighing on metals prices. Contracts are mostly dollar-denominated, and prices typically fall when the U.S. currency gains, which has been the case in recent weeks as markets prepare for the U.S. Federal Reserve to begin raising interest rates. A wider difference in interest rates between the U.S. and its trading partners typically strengthens the dollar.

Another key metal, iron-ore, was also down. The benchmark price of iron ore with 62% iron content imported through China's Tianjin port was down 2.3% to $79.80 a metric ton on Monday, according to data from the Steel Index, a research firm. Prices are down 40.5% from the start of the year.

Iron ore "is such a big part of Chinese development and Chinese demand that isolated it is more of an indicator of health than something that's more global," said Jodie Gunzberg, global head of commodities at S&PDow Jones Indices.

The market isn't betting on a collapse in metals prices. Most see Monday's decline as limited to a removal of some of the over-enthusiasm that had built up around the Chinese government's actions. But the Asian giant remains a huge global player and, even at a slightly slower pace of growth, will retain its voracious appetite for raw materials. A number of metals markets are expected to move into deficit, with demand outstripping supply.

"A stronger U.S. dollar has taken the shine off these metals and led to a selloff for now, but the underlying issues remain and we would expect the market to start focusing on a lack of future copper and zinc supply growth as we move into 2015," said Catherine Raw, a fund manager at BlackRock.

Write to Ese Erheriene at ese.erheriene@wsj.com and Matthew Cowley at matthew.cowley@wsj.com

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