[cripplecreek]

Pure platinum.

[Obama_Is_Sabotaging_America]

Possibly a precious metal or perhaps something we don’t even have on Earth. That sand looks moist.. Clumpy.

[muawiyah]

The rocks there look like substantially deteriorated and corroded nickel-iron meteor debris. The 2% content which is gold should be visible.

Earth has a much more active atmosphere, and tectonic forces at work, so we rarely see a full meteor in situ.

Gold mining on Mars should be fairly basic ~ walk around and pick up flecks. This stuff won't even be eroded down to gold flour ~ but it won't be nuggets either since it won't have passed through a bacterial mat that would expell it in nodules.

[rusty millet]

That last picture looks like south Georgia soil.