MEXICO CITY, Dec 6 (Reuters) - Mexican authorities will

investigate an incident at a gold mine in the Pacific coastal

state of Guerrero which killed three workers, President Claudia

Sheinbaum said on Friday.

Canadian company Torex Gold, which operates the

mine, reported on Thursday that two employees and a contractor

had been killed after being exposed to carbon monoxide gas.

Another contractor was exposed and hospitalized, Torex said

in a statement. It paused operations.

Sheinbaum told a press conference the labor ministry and

civil protection authorities were reviewing the case and would

work with the families of the victims.

She added that she had asked Labor Minister Marath Bolanos

to increase inspections of mines.

"Because it can't be that some standards are applied by

Canadian companies here (in Mexico) and others (by Canadian

companies) in Canada," Sheinbaum said.

Canadian miners hold $6.29 billion in assets in Mexico,

according to data from the Canadian Trade Commissioner.