Not frostquake, real earthquake; magnitude 2.6, Feb 3 at 2:30PM centered about 11 miles northwest of Potosi. For John and Flash, that's just across T HWY from the slime pond, and before you even think it, it was over 8 miles deep, the mine shaft at Indian Creek only went to 960 feet.
that would have been about 8 miles north of me. As I understand it, people right above a deep earthquake frequently do not feel much, the shifting is sideways so the shakes are felt in outward circles.