stock certificate

Any advice on these? My dad and I recently thought to see what else was in the frame wanted to make sure any picking want for to water damage and there were more on the backside as of they were hidden there on purpose.

I recently picked up this stock certificate from the Homestake Mining Company that was issued on February 9, 1880. It had been signed by J.K. Goodrich and J.B. Haggin. Haggin of course was one of the three mining magnates who founded the Homestake Mining Company with George Hearst and Lloyd...