Simplify the following text for a Grade 4 native English-speaking person.
Original: The initial discovery of gold at Adelong by a Mr Williams took place in 1857 , the find being located on the crest of Victoria Hill and representing the weathered capping of the Old Hill Reef .
Simplified: Gold was discovered at Adelong by a William Williams in 1857 . The gold was on the top of Victoria Hill and was part of the Old Hill Reef .