Children Working in 19th Century Coal Mines – a selection of websites including specific content created for school students.
Tuttle, Caroline (no date given) Child labor (sic) during the British industrial revolution Retrieved from Economic History Association website
Dean, Jacqui & Fines, John (201) Children in Victorian Britain: down the mine Retrieved from Primary History Association website
For a more detailed case study you might want to take a look at the Huskar pit disaster of 1838 where 26 children were drowned when the Huskar Pit flooded. You can find more information on the Wikipedia page and the Peniston history archive.