(Updated at 10:34 a.m. ET/ 1534 GMT)

By Ragini Mathur

Dec 13 (Reuters) - Canada's main stock index extended

its losses from the previous session on Friday, hurt by mining

and energy shares, while investors grappled with global economic

uncertainty and tariff threats, weighing on the market

sentiment.

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

was down 122.34 points, or 0.48%, at 25,288.37, and

was set for its first weekly loss in six.

The index also inched closer to hit its biggest weekly loss

since the week of September 3.

Canada's materials sector slid 1.6% with gold

prices falling ahead of potential U.S. rate cut at the Federal

Reserve's Dec. 17-18 meeting, while copper prices came under

pressure from a stronger dollar.

Additionally, energy lost more than 1% despite

higher oil prices.

Telus ( TU ) fell 1.8% after the National Bank of Canada cut

the telecom firm's rating, dragging the capped communications

sector 1.5% lower.

"Volatility may remain present as the market processes

global economic uncertainties which seem to be particularly

abundant at present," said Robert Gill, senior vice president &

portfolio manager at Goodreid Investment Counsel, referencing

recent U.S. tariff threats and geopolitical upheaval in the

Middle East and Eastern Europe.

The Bank of Canada's interest rate cut by 50 basis points on

Wednesday sparked fears in the market about economic growth,

amid looming tariff threats by U.S. President-elect Donald

Trump, as the United States is Canada's biggest trading partner.

The information technology sector gained 0.8% as

it received a boost from electronics firm Celestica ( CLS )

that scaled to a record high.

In economic data, Canadian factory sales grew by 2.1% in

October from September on higher sales of petroleum and coal

products, as well as transportation equipment.

Among other stocks, Enghouse Systems ( EGHSF ) dropped 10.3%

to the bottom of the TSX after the software and services firm

missed fourth-quarter revenue estimates.