This 7 x 5 x 3.5 inch deep rock is heavy for it's size. My estimation of gold content is : Low estimation is 4 ounces, and high estimation 20 pehaps close to 30 ounces of gold. To have the exact amount of gold analysised was informed the rock need to be crushed, so I'm selling it as is. When you look at the rock on a sunny day 80% of the rock glitters with gold, but the camera doesn't show this as good as looking at the rock. Larger pieces of gold seen are around 4 to 5mm in diameter. This rock comes from the once was gold mining town of Nanango.