GRAPEVINE — These bones won’t talk — at least not until they’re unearthed again.Still smarting over the theft of dinosaur footprints this spring, the Army Corps of Engineers and the city of Grapevine have reburied parts of a Columbian mammoth that were found along the receding shore line.Visitors came across a jawbone and part of a tusk, and there may be more bones in the area, but there are no plans to study the location that is somewhere on 1,200 acres of Corps property under lease to the city, said Dale King, a conservation specialist with the corps. The find...