June 24 (Reuters) - Futures tracking Canada's blue-chip stocks edged lower on Wednesday as investors assessed developments in U.S.-Iran negotiations, with caution prevailing amid disagreements between the two countries over key terms of a deal.

September futures on the S&P/TSX index SXFcv1 were down 0.1% at 36 a.m. ET (1036 GMT).

• U.S. President Donald Trump said on Tuesday that Iran had agreed to nuclear inspections into "infinity," while Tehran said it had made no such concession in negotiations, raising questions about the viability of their fragile peace deal.

• Oil prices fell more than 1%, extending this week's losses to hit fresh four-month lows on signs that more oil tankers are set to move out of the Strait of Hormuz. O/R

• Spot gold XAU= and silver XAG= slipped 1.9% and 1.8%, respectively, as the dollar climbed due to rising bets on U.S. rate hikes. GOL/

• Canada's S&P/TSX Composite Index .GSPTSE ended lower on Tuesday as lower commodity prices and a tech-led selloff on Wall Street weighed on the market, with metal mining shares leading the declines.

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