RE:EarthquakeI looked on a US earthquake geo site and according to their map, they should have received magnitude 3 or 4. They are lucky they weren't closer. I sure hope everybody is OK. It will be a tragedy for many people.
You can zoom in....the mine is south of Cocula across from the lake from Balsas at 18.01 N 99.74 W
https://earthquake.usgs.gov/earthquakes/eventpage/us2000ar20#map?ShakeMap%20Stations=true&shakemapSource=us&shakemapCode=us2000ar20