That is, iron, brass, gold and silver, to make a huge bell. There's a Chinese story from the 15th century in which it cannot be done until.......The story is called "The Voice of the Bell." See here - it has more than one name.
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'kongai'
Supposedly, it took place in 1420 or so! Though it's also written, somewhere, that the bell had to be replaced in 1924. Another strange thing is that from what I've been able to find out, Ko-Ngai is hardly a Chinese name.
Anyway, I wondered if maybe it wouldn't really have been that hard even back then, in which case the motives for the tragedy were probably completely different.
Lenona.