I learned this method from an anchor I followed a few months ago, and then I also used this method to increase a lot of ores. I don’t know who first proposed this method.
I use a knightmetal pickaxe with Silk Touch found in the twilight forest and a remote activator, so that there is no need to leave a gap for ignition and block it with ore immediately.
PS: don’t try to multipling enriched naquadah ore with this method, it will cause explosion!