Down an english mine, an unexpected explosion damages David’s chance of earning a decent living, thus sending ripples through the Cornish village.

Not much more to say all the above comments covered it all.

Best you check out the 'Formula' tab up top for more information about loglines.

You need a lead character

Conflicting message. An explosion deep inside of a mine rips through the village? How does that happen exactly? I would think this is one or the other for an explosion. Follow dpg's advice and fill in the formula. You have the explosion as a catalyst, now who must do what before something bad happens.