This is called "anti-bow evil spirit" in geomantic omen. You can put a pair of Guanyin jade, which can not only strengthen the power of copper coins, but also restrain the spirit of Guanyin jade with Kaiyuan coins and jade engraved with spells. Kaiyuan money is gold, jade is soil, and soil is gold.
Let kaiyuan's money flow continuously. It will be effective to open cinnabar with copper coins, otherwise it will have no effect!
Let's see what others say.