On our recent trip to Western Australia, we visited the Gold Mining town of Kalgoorlie where we visited the Gold Mine Museum. There we descended down the mine shaft into the depth of the earth to see how the miners used to have to crawl through the many tunels looking for gold seams.
After we surfaced again, we were taken into the gold toom where an employee cast a genuine gold bar. Unfortunately we couldn't keep it.
Here's a little video of the experience...