* TSX up 34.50 points at 13,736.83

 * Four of 10 main groups rise, led by materials

 (Updates with details, comments)

 By John McCrank

 TORONTO, April 19 (Reuters) – Toronto’s main stock index

ended a three-day slide on Tuesday as high commodity prices —

including record gold prices — helped spur a rally among

miners, pulling the index from its lowest point in a month.

 The index’s mining-heavy materials sector advanced 1.39

percent as gold topped $1,500 an ounce and silver hit a 31-year

high above $43 an ounce. Precious metals prices rose as a weak

greenback, crude oil gains and worries about sovereign debt

problems in Europe encouraged safe-haven buying.

[ID:nLDE73I0RF] [ID:nL3E7FI1AA] [GOL/]

 Mining shares have been languishing as of late as investors

question whether or not the recent rally in commodities is

sustainable.

 “The gold group is still lagging the price of gold, but

that could change if gold continues to rally,” said Elvis

Picardo, analyst and strategist at Global Securities in

Vancouver.

 Gold miner Agnico Eagle (AEM.TO) rose 4.44 percent to

C$63.95, Silver Wheaton (SLW.TO) rose 2.24 percent to C$41.00,

and First Quantum Minerals (FM.TO) rose 3.16 percent to

C$120.49.

 Diversified miner Teck Resources (TCKb.TO) jumped 5.86

percent to C$51.62 after the company posted earnings late on

Monday that more than doubled those reported a year earlier and

beat expectations. [ID:nN19294036] [ID:nN18242433]

 Also in the materials group, Potash Corp (POT.TO) was up

2.99 percent at C$54.84. Canpotex, the overseas potash

marketing arm of Potash Corp, Mosaic (MOS.N) and Agrium

(AGU.TO), said it will develop a railcar maintenance facility

in Saskatchewan to help boost the amount of potash it can

transport. [ID:nN19294544]

 The Toronto Stock Exchange’s S&P/TSX composite index

.GSPTSE ended up 34.50 points, or 0.25 percent, at 13,736.83.

Just four of its 10 main groups were higher.

 Trading was light ahead of the Easter long weekend and

Passover, so moves may have been exaggerated, said Paul Hand,

managing director at RBC Capital Markets.

 “In the absence of specific moves I wouldn’t read a lot

into moves in stocks until we’re well through this period and

into next week,” he said.

 The heavyweight financials and energy sectors were nearly

flat.

 The technology group was down 0.47 percent, dragged lower

by Research In Motion (RIM.TO), which one of the biggest

decliners on the day, off 3.77 percent at C$50.85. The maker of

the BlackBerry launched its PlayBook on Tuesday in hopes of

winning customers away from Apple’s dominant iPad tablet

computer, but lineups of buyers were scarce. [ID:nN19146402]

 “It’s been a little bit of a disappointment as far as the

launch is concerned,” Picardo said.

 He said that with earnings season starting, there might be

more action on the TSX next week.

 “Investors seem to be in a pretty unforgiving mood as far

as earnings are concerned, so any company that disappoints is

going to be cut down quite sharply.”

  ($1=$0.96 Canadian)

 (Reporting by John McCrank; editing by Peter Galloway)