I have been talking to the owner of the photograph in this link I put on earlier today.

http://agoracom.com/ir/steliasmines/forums/discussion/topics/520214-it-s-a-great-weekend-to-go-short-hunting/messages/1648970#message

He informed me that the yellow seen so easily there is staining. I cannot distinguish it myself from this photo even after I zoomed in as close as I could. He told me there is visible gold in that photo, but you had to zoom in to see it. Gold can be many colors/shades and without having actual confirmaion, it is hard to tell from a photo. So, it is possible that the yellow is yellow ochre in this particular photo, but does not deny the fact that there is visible gold in this photo as well, somewhere.