Image 1.This gold came from a site where a Permian river containing nuggets was covered with basalt lava and recently exposed by erosion.
Image 2. From the Pilbara in 2010....still looking for the next one...hopefully the Zed with the 19 inch coil will get one!
Image 3. Mainly razor blade thin leaf gold from Geogetown, Northern Qld. Big quartz blows punch up through thinly bedded shale and the gold forms between the bedding planes in the shale...I think.