Op/Ed: I-186 ensures mining companies keep Montana's water clean.

Just west of our little ranch on North Willow Creek lies a town that once burst at the seams with mines and miners.

Pony, Montana, boasted 5,000 people, banks, bars, schools, churches and a rail line. Mines with romantic names like Boss Tweed and Clipper dotted the hills above town. Between the 1870s and the 1920s, millions of dollars of gold came out of the hills. After the 1920s, when the gold p...