So what is it?
Do you have an assay or not?
So you are quite bold then, dissolving unknown substances in acids!
There are many substances that may harm or even kill you in rocks.
Ores are rarely treated with acids, and never unless you have a proper assay.
And there is more than one reason for that.
Stannous is easy to make, just dissolve some Tin in HCl.
How do you know you have Gold in the rocks if you have no test showing it?
Here, read this whole thread, thoroughly!
https://goldrefiningforum.com/threa...s-before-you-post-about-ore.32137/post-341903