Updated from 1:09 p.m. EDT

Metals investors hit the sell button again Monday sending gold, silver and copper into a tailspin. For gold, that meant the psychologically important $600 level was pierced for the first time since June 29, with prices for December delivery of the metal closing at $597 an ounce, off $20 for the session on the Comex division of the New York Mercantile Exchange. A whole host of factors weighed of the metals, not least of which was hopes that the standoff between the West and Iran can be resolved diplomatically. European and Iranian diplomats met on Sunday to discuss cutting Iran's nuclear program, with an Iranian official saying the country may cut its nuclear program.

"We have reached common views on a number of issues," Ali Larijani, Iran's top nuclear negotiator, said on Sunday,

Bloomberg

reported. "Many of the misunderstandings were removed."

The news about Iran, as well as OPEC's pledge to maintain full production, put further

downward pressure on crude prices Monday. Gold has been following crude's trend as crude is a barometer of inflation pressures, for which gold is ahedge.

Speaking to the National Association for Business Economics Monday, St. Louis FedPresident William Poole reiterated his support for the Fed to formally adopt an inflation target. "I do not believe that uncertainty about the Fed's inflation objective is a large issue at present, but do believe that there is an opportunity to improve clarity," Poole said.

The adoption of an inflation target would likely mean more rate hikes since inflation is currently running above the Fed's perceived comfort zone. "To maintain credibility the monetary authority must deliver what they said they would deliver," Pool said."Credibility is essential to the stability of longer-term inflation expectations."

Currency markets did not react uniformly however, with the dollar mixed against major currencies. The greenback was buying 117.585 yen, up from 116.90 yen Friday. However, the euro was trading at $1.2698, up slightly from $1.2671 late last week. Gold tends to move inversely with the dollar, which itself is prone to rise on expectations of higher interest rates.

The dearth of gold buying by jewelry fabricators in India as the fall wedding season starts in earnest was also weighing down on sentiment.

"Jewelry demand is conspicuously absent, so the fickle money is leaving," says Jon Nadler, metals analyst at Montreal-based bullion dealer Kitco. As a result, he says, funds were continuing the process of unwinding positions that had started last week.

"If we are heading into stagflation, then where will the discretionary income to buy baubles come from?," asks Nadler.

Some reports pointed to rumors of central bank selling as a possible reason for the dramatic decline, as was possible redemptions by the exchange traded funds that hold the metal, the

streetTRACKS Gold Shares

(GLD) - Get Report

and

iShares Comex Gold Trust

(IAU) - Get Report

. The validity or otherwise of such assertions should become apparent before long as data is released over the next few days.

The market has remained on watch the past few weeks as the European Central Bank looks less and less likely to sell the approximately 160 tons of bullion that remain in its quota under the terms of a multi lateral agreement that expires Sept. 26. Hence, when major downward pressure materializes, rumors of ECB involvement tends to appear whether or not based on concrete fact or not. The breach of technical support, which had been expected at around $600 an ounce level, triggered further selling giving the yellow metal little chance of a meaningful rebound.

The

Market Vectors Gold Miners

(GDX) - Get Report

, which tracks a broad-based group of stocks, was shedding 6.3%, while the Amex Gold Bugs Index, which tracks un-hedged gold producers was losing 6.4%. Shares of the miners were being slammed, with

Agnico-Eagle Mines

(AEM) - Get Report

,

Hecla Mining

(HL) - Get Report

and Meridian Gold

(MDG)

, down as much as 9%. Industry bellwether

Newmont Mining

(NEM) - Get Report

was losing 4%.

Silver bullion was tumbling also with prices for December delivery closing off $1.06 cents at $11.20 an ounce on the Comex. The ETF that holds the metal,

iShares Silver Trust

>

(SLV) - Get Report

was following suit, down 8.25%, recently.

Although the white metal frequently follows the gyrations of the gold market, as an industrial metal demand is also affected by changes in economic activity. The metal could likely see further declines as increased evidence of a slowdown becomes apparent.

The sector rout was slamming producers with

Silver Wheaton

(SLW)

, off 10%, and

Coeur d'Alene Mines

(CDE) - Get Report

, lower by 7.5%.

In base metals, copper wasn't immune from the mayhem either. Tension over a forthcoming set of labor negotiations, which could dramatically affect supply of the metal, failed to provide any buoyancy and contracts for December delivery of the red metal closed down 15 cents at $341.50 a pound on the Comex. Shares of U.S. copper producer

Phelps Dodge

(PD) - Get Report

were shedding 6.7%, while those of

Southern Copper

(PCU)

were declining 5.5%.

Among the larger diversified miners, shares

Rio Tinto

(RTP)

, and

BHP

(BHP) - Get Report

were falling 5.2% and 5.3%, respectively.