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NEW YORK—Copper prices briefly surged to a new record Monday on supply concerns fed by a mining stoppage in Chile, the world’s largest producer of the metal.

Other commodities traded mixed, with crude surging to a record above $120 and agriculture futures mostly falling.

Subcontract workers at Chile’s state-owned copper giant Codelco went on strike April 16, alleging the company reneged on an agreement that ended a monthlong strike last year. The stoppage has frozen work at two of Codelco’s five mines, halting 28 percent of Codelco’s total production and 3 percent of gl...