where was this mine
when did it go bankrupt or out of business
According to this book:
this company went out of business around 1905.
were the stamps on the front interest paid or what where they for
The two stamps paid the revenue tax on the stock certificate.
If the 20 cent stamp says "Foreign Exchange" on it, then it's worth around $80 or more, depending on its condition and centering (can't tell either from your photo).
If it says "Inland Exchange" on it though then it's only worth maybe a dollar.