Statistics for occurrence #1 of “Arapahoe county” in entry colorado of Harper's Encyclopedia of United States History:

...ring lode was by John H. Gregory, May 6, 1859, in what is now known as the Gregory mining District, in Gilpin county. An attempt to organize government among the miners was made by the erection of Arapahoe county , and the election of a representative to the Kansas legislature, Nov. 6, 1858. He was instructed to urge the separation of the district from Kansas and the organization of a new Territory. The fi...
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