* TSX futures down 0.7%

* Oil up more than 1%, gold slips

April 23 (Reuters) - Futures linked to Canada's main

stock index fell on Thursday after Iran tightened its grip on

the Strait of Hormuz, renewing shipping concerns with no signs

of peace talks resuming.

June futures on the S&P/TSX index were down 0.7% at

6:28 a.m. ET (1128 GMT).

* Iran on Wednesday seized two ships trying to exit the

Strait and demanded Washington lift its naval blockade, which

remains in effect even after U.S. President Donald Trump

extended the ceasefire indefinitely.

* Oil prices extended gains on the renewed uncertainty,

rising more than 1% as stalled peace talks showed no signs of

restarting and traffic through the critical strait remained

restricted.

* Spot gold and silver fell 1% and 4.1%,

respectively, as higher energy prices revived inflation fears

and concerns of prolonged high interest rates.

* The Toronto Stock Exchange's S&P/TSX Composite Index

had ended higher on Wednesday after Trump's

announcement, clawing back some of the previous session's

losses.

* Apart from the situation in the Middle East, investors

are also tracking corporate earnings in the U.S. and Canada to

gauge the economic impact of the Iran war.

* Teck Resources ( TECK ) beat analysts' estimates for

first-quarter profit, aided by an increase in copper prices and

record sales.

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