The boom years 1844-1850
Post-boom years 1851-1861
Civil War years 1861-1865
Postwar years 1865-1880
Expansion Period 1880-1900
Twentieth Century 1900-1967
Once the rush was over, most, if not all of the non-producing companies disappeared, and those that were left usually had a chance of survival, Quincy being one.