Jan 9 (Reuters) - Futures tracking Canada's resources-heavy stock index inched lower on Friday as investors turned cautious ahead of key jobs reports and a U.S. Supreme Court ruling on the legality of U.S. President Donald Trump's tariffs.

March futures on Toronto's S&P/TSX Composite index were down 0.1% as of 6:16 a.m. ET.

The benchmark closed Thursday back within reach of a record high touched earlier in the week, tracking gains in oil prices.

December jobs data for Canada, due at 8:30 a.m. ET, is expected to show the economy shed 5,000 jobs during the month compared with 53,600 jobs added in November. The unemployment rate is seen rising to 6.6% from 6.5%.

Traders widely expect the Bank of Canada to hold interest rates at its next policy meeting on January 28.

U.S. jobs data for December, also due at 8:30 a.m. ET, is expected to show hiring slowed last month.

Investors are also keeping a close eye on the U.S. Supreme Court's ruling, expected at 10 a.m. ET, on the legality of Trump's sweeping tariffs. If he loses, it could spark a fight over roughly $150 billion in potential refunds from the government for duties already paid by importers.

Trade data released on Thursday showed Canada's share of exports to the U.S. fell in October to its lowest non-pandemic level.

Meanwhile, oil prices rose for a second straight session as concerns over civil unrest in Iran were offset by potentially higher supply from Venezuela.

Gold prices steadied ahead of the U.S. jobs report, while silver prices rose 1.1%. [GOL/]

Among companies, apparel retailer Aritzia and cannabis producer Tilray Brands reported strong quarterly results on Wednesday. 

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(Reporting by Utkarsh Tushar Hathi; Editing by Jonathan Ananda)