U actually can get more than 1million ancient casket from just 1 mined block/mineral if u just edit the .xml in nokhlad mod's folder> setting>thingdef>rock>rock.xml. But it will be laggy+framedrop coz of spawn (plus its wont stack, so alot of space will be consumed and might fill all ur map) So just fills 10-20ish between 2 <count>, below Stonebox.