In the 1890s, Montana’s Marysville gold camp grew to about 4,000 people; today, its population is officially 82, with local estimates closer to 90–100

Marysville, Montana, once stood as a vibrant mining hub in the late 1800s, largely thanks to the rich yields from the Drumlummon Mine. At its zenith, this gold-producing site attracted a thriving community. However, as mining operations floundered, the population sharply declined, resulting in a mere handful of residents. The town's experience highlights the challenges faced by economies overly reliant on singular resources, underscoring the lessons on sustainability.