This mod adds the /drop [param...] command, which sets a blacklist for unwanted drops. Very useful for mining if used to blacklist cobble and silver sand as shown:
/drop default:cobble default:silver_sand
Each player has their own blacklist. For now, every blacklist is reset when the server resets.
Special thanks to tacotexmex, creator of item_drop of which I... inspired some code, and N7na who helped in the development.