Halton Regional Police are investigating a theft at Dufferin Aggregates' Acton quarry.
Over the June 15-16 weekend, police say someone cut the fence and entered the Third Line quarry.
Copper wiring was removed from equipment and machinery on the site, according to police.
The value of the copper wire, plus the damage to the equipment, is estimated at more than $5,000.
No suspect descriptions are currently available and no arrests have been made yet.
The investigation is ongoing.
Anyone with information can contact police at 905-825-4777 or Crime Stoppers at 1-800-222-8477 or haltoncrimestoppers.ca.
