For Silver, make you use the the right Mr (to about 4 or 5 sig figs), I only did it to 3 sig figs and it wouldn't accept my answer so I wasted 30 mins on it when I practically had the right answer.
Could someone provide some more advice on Gold. I think it's a bacterium, in particular a halobacteria because of the reddish colour in a couple of the pictures but it won't give me the right answer.
I've looked up what each place is and I got someplace in the middle of Spain (near Seville), the Great Salt Lake, Adelaide (Australia) and Harare (Zimbabwe).
So any further hints?