Police were called to an area of bushland off Clancy Street in Boulder about 9:00am today following reports of a motorcycle crash.
They found the boy dead at the scene.
A motorcycle reported stolen yesterday is believed to have crashed into a utility.
Police said the utility was linked to the owner of the stolen motorcycle.
The 55-year-old man was charged with manslaughter and refused bail. He is due to appear in the Kalgoorlie Magistrates Court tomorrow.