* TSX up 0.5%

* Oil, gold prices rise

* Rogers Communications ( RCIAF ) rises after Q1 revenue beat

(Updates prices and details throughout)

By Tharuniyaa Lakshmi

April 22 (Reuters) - Canada's main stock index opened

higher on Wednesday with broad-based gains after U.S. President

Donald Trump said he would extend the Iran ceasefire

indefinitely, even as Tehran's seizure of two ships in the

Strait of Hormuz kept investors cautious.

At 10:41 a.m. ET, the Toronto Stock Exchange's S&P/TSX

Composite Index was up 0.5% at 33,975.86 points.

Iran's semi-official Tasnim news agency said the

Revolutionary Guards had seized two vessels for maritime

violations and escorted them to Iranian shores. It was the first

time Iran has seized ships since the war began at the end of

February.

Energy shares rose 0.3%, mirroring higher oil

prices amid supply concerns.

There's tentative optimism among investors, but the oil

market is trading as though the ceasefire is fragile, said Brian

Madden, chief investment officer at First Avenue Investment

Counsel.

The overall market will likely focus on corporate earnings

in the next couple of weeks as the initial shock of the war is

over, he said.

Ten of 11 TSX sectors were trading in the green on

Wednesday.

Shares of miners led gains on the index; Silvercorp Metals ( SVM )

, AbraSilver Resources and Ivanhoe Mines ( IVPAF )

rose between 5.8% and 5.9%, tracking higher gold and

silver prices.

Among other stocks, Rogers Communications ( RCIAF ) rose

10.4% after the telecom company posted first-quarter revenue

slightly above estimates, as it benefited from expanding its

media and sports portfolio.

Metro fell 2.9% after the grocery retailer said the

Laval labor dispute will have an impact on the company's

third-quarter results.