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About 10,000l of weak acid was spilt when a tanker truck overturned within the mine site at the Sonora state operation. About 50m2 of stony ground was affected, Profepa said.
The company put up barriers to contain the spill, neutralized the acid with lime and removed the spilt liquid. In addition, the affected area was neutralized and cleaned, the agency said.
Profepa will visit the area to test for soil contamination and to determine if any remediation work is required.
No-one from the company was immediately available to comment. La Caridad, operated by subsidiary Southern Copper, produced 74.5Mlb copper in Q2, up 4.1% on the same period last year.