According to "https://www.pennminerals.com/collecting", it says "VALLEY QUARRY - GETTYSBURG - has been a popular collecting site for years producing various copper minerals and zeolites.  Although presently, zeolites have become somewhat rare, a nice suite of copper minerals are being found.  Bornite, chalcocite, chrysocolla and a trace of native copper have been seen.  Other species include epidote, andradite, chabazite, chalcopyrite, djurleite, stilbite and heulandite. Quarry is open for collecting to groups and clubs by appointment only. Contact the quarry superintendent (717) 334-3165. Quarry is located along Rt. 97, about 0.5 mile west of Rt. 15."

I do not know how up to date the info and the quarry itself might be under new ownership.