1. Properties of the Bertha G.M. and M. Co. Gilipin County Colorado ... each full claim 1500 feet in length, Bertha Properties are those lined Yale Public content 1901. 2021-01-20T21:25:44Z. 2021-01-23T04:01:38Z. Rank, Samuel A., cartographer. Bertha Gold Mining and Milling Company. English. cartographic image. Public. Colorado, Gilpin County, Gilpin County (Colo.), and Gilpin County.