A two-kilogram gold nugget worth about $130,000 has been found on the outskirts of Victorian gold rush town Ballarat.

A prospector, who asked to remain anonymous, found the nugget in an old pasture in June.

A 2kg gold nugget worth roughly $130,000 that has been found on the outskirts of Ballarat. Credit:AAP

Mark Day of Gold Ballarat said the man, a retiree and customer, had already received offers of $160,000 for the precious haul.

"When he showed me the nugget here in the store he was shaking like a leaf. He didn't know what to do with it. He hadn't slept in three days," Mr Day said on Friday.