Ero Copper (ERO) reported Q1 adjusted earnings late Monday of $0.35 per diluted share, up from $0.16 a year earlier.
Analysts polled by FactSet expected $0.18.
Revenue for the quarter ended March 31 was $125.1 million compared with $105.8 million a year earlier.
Analysts surveyed by FactSet expected $121.1 million.