Pfizer's medical research lab in St. Louis County, Minnesota, is missing $700,000 worth of gold dust. It is not clear for what purposes the pharmaceutical giant uses the precious metal.
According to the St. Louis Post-Dispatch, police are trying to determine whether it was lost or stolen.
The company alleged bought gold dust last year for use in research.
Gold experts believe it would be difficult for a thief to sell that amount of gold dust, which could weigh between 14 to 30 kilos (30 to 70 pounds), depending on its purity.