Comment by timschmidt
2 hours ago
The surface of mars is roughly the size of Earth's dry landmass. They'd have to spend quite a lot of effort looking for it to find it. And at that point it'd probably look more like a treasure trove of useful thermoplastics, refined metals, magnets, and other useful things otherwise difficult or expensive to source on Mars directly.
man, you spent more time thinking about that than I expected anyone to actually do
I find that pessimism holds most of it's practitioners back from their full potential.