The Canadian stock market registered a slight loss Wednesday after a series of selloffs pushed its main index to a seven-month low amid anxiety over Greece's possible exit from the eurozone.

The S&P/TSX composite index was down 16.97 points, or 0.15 percent, to 11,326.08 while the S&P/TSX Venture Composite Index dropped 22.33 points, or 1.80 percent, to 1,217.74. The market has plunged about 400 points over the past three sessions alone, leaving the main index on the Toronto Stock Exchange at its lowest levels since October.

Greece has weighed heavily on buying sentiment since an inconclusive election on May 6 left no party with enough votes to form a government. Nine days of talks failed to produce a coalition government and Greeks will go back to the polls on June 17.

Many Greeks voted for parties that want to see the country abandon the tough austerity measures adopted in return for the huge international bailouts that are propping up that country.

Without agreeing to another round of austerity measures, it's conceivable that Greece's partners in the eurozone will withhold the next round of bailout cash. An exit from the euro could then become inevitable. But if Greece leaves the euro, then a precedent would be set that could be taken up by other countries burdened by high debt levels. Those worries have resulted in investors demanding higher returns from Spain and Italy.

The yield on Spain's 10-year bond, a gauge of investor concern, was up at 6.33 percent, while Italy's rose to 5.85 percent. Though down on the levels they hit last November, the two rates are uncomfortably near the seven percent level, which is widely considered to be unsustainable in the long-run.

On the Canadian stock market, the base metals and mining sector was ahead 1.41 percent as copper prices continued to slide with the July contract down another four U.S. cents to 3.47 U.S. dollars a pound, its lowest level since early January. The metal, viewed as an economic barometer since it is used in so many industries, has plunged 10 percent this month. Teck Resources dropped 1.51 percent to 29.94 Canadian dollars per share while First Quantum Minerals ran up 5.34 percent to 17.74 Canadian dollars.

The June crude oil contract on the New York Mercantile Exchange lost 1.24 percent to 92.81 U.S. dollars, its lowest level since last November. The energy sector moved down 0.69 percent and Suncor Energy Inc. lost 0.8 percent to 27.45 Canadian dollars and Canadian Natural Resources slid 0.37 percent to 29.33 Canadian dollars.

The deterioration in investor confidence has left the Canadian stock market at its worst level since early October of last year, down more than 10 percent from its most recent highs registered at the end of February.

The resource sector has led the fall with the Toronto Stock Exchange material stocks index down 20 percent since the start of the year and the energy sector off about 13 percent.

On the currency front, the Canadian dollar was down 0.57 U.S. cents to 0.9877 U.S. cents. One U.S. dollar was buying 1.0125 Canadian dollars at 5 p.m. local time (2200 GMT) Wednesday, compared with one U.S. dollar purchasing 1.0066 Canadian dollars Tuesday.