Documents from the G. M. Colvocoresses mining collection. Description: Reports with assays. Property Name: Congress. Property AKA: Congress Mine, Patented 878; Fraction, Patented 883; Niagara; Niagra; Golden Key; Herskowitz Property; Queen Of The Hills; Ohaha; Planet Mier; Jaquays; B And M; Patented Claims Ms 2888 & 3523