From "http://cashandtreasures.wikifoundry.com/page/Pennsylvania", "Mineral clubs will sometimes have field trips to this active quarry, otherwise it is closed to mineral collectors.

Helpful notes to newcomers: The National Limestone Co. quarry is well known for good specimens of wavellite, calcite crystals,and strontianite.

Handy to bring along:
1. Sledge hammers and hand picks
2. chisels
3. safety gear"

Also some info found here: "https://www.mindat.org/loc-145516.html"