Small FYI - that mining boom meant that laws against races, religions, or otherwise meant remarkably little. The Copper Barons ran the cities, and all they were interested in was your labor, either in the mines or in support of the miners. Of course, this was also a time when the color of your skin mattered less than your place of birth. Irish and Chinese were held in equal contempt.

Even today, some of those mining towns are bigger melting pots of various races, religions, and cultures than the port cities.