A 12-year-old boy has died in hospital following a dirt bike crash in rural Hamilton on Monday.

Police say the boy was riding in a field near Binbrook Road and Fletcher Road with another family member at about 5:50 p.m. when they became separated.

The family member later found the boy, who had fallen off his bike and was unresponsive.

"It appears that he lost control of the dirt bike and suffered serious injuries, rendering him unconscious," police said Monday morning.

When emergency crews arrived on scene, the child did not have any vital signs.

He died in hospital a short time later.

An accident reconstruction team was on the scene trying to determine what caused the crash. Police say there was no foul play.