Who was the youngest child who worked in the cole mine big pit?

The youngest child known to have worked in the Big Pit coal mine in Wales was a boy named William "Billy" Owen, who started working in the mine at the age of just 10. Many children during that era, particularly in the 19th and early 20th centuries, were employed in dangerous and physically demanding jobs like mining to support their families. Child labor was prevalent, and it wasn't until later that laws were enacted to protect children from such hazardous work conditions.