Which term best describes the economic condition of Kennicott after copper was depleted?

The term that best describes the economic condition of Kennicott after copper was depleted is abandonment. This term aligns with the fate of many mining towns that experience a boom when resources are plentiful but face sharp declines once the resources are exhausted. In the case of Kennicott, once the copper mines were no longer productive, the economic vitality vanished, leading to the town being largely deserted. This reflects the historical phenomenon where mining communities often depended entirely on the continued extraction of minerals for their survival, and once that was gone, there was little else to sustain the population or economy. The other options, like thriving, prospering, and stable, do not fit this narrative, as they suggest a continued or improved economic condition, which was not the case for Kennicott after the depletion of copper resources.