RE:Magma Chamber? Is this a problem?
A magma chamber exists under the ZEN graphine desposit. They can only dig so far down before that thing starts to get the urge to blow its load all over northern Ontario.
https://www.zenyatta.ca/article/the-project-1391.asp Scroll down to the Schematic Desposit Model.
This is why this project is having a difficult time being started. If you are not familiar with magma chambers then check out
https://www.rt.com/news/419097-volcano-super-eruption-japan-kikai/