The oportunity of gold panning is when I read two books.
Books are” Gold panning in Hokkaido” by Kimio Kato and “Legend of gold panning” by Toyo Waki in the 1970s.
I was interested that the roman still exists in Japan.
I could not get the information for gold panning on the Internet because there was no computer.
I saw the article of production data in each river at the National Diet Library.
Production was very small. It became one of the reasons that there is no interest in gold panning.
author Kimio Kato” Gold panning in Hokkaido