You can sell it at Pawn shops. It is best to shop around to get the best price.
In Rapid City, Presidential Pawn is a favorite of local prospectors. They have many large nuggets on display that miners have brought in. That is where I sold mine.
I wish I hadn't sold it, but I needed the money to pay for my move to CO. Since then, the price has gone up $1,500 per ounce. I got a good deal, but it would be much more valuable today. The gold that I dug back in 2015 has tripled in value.
I guess I will just have to go dig up more. 😁
