Izzy, have you seen this site that talks about copper biounavailability?
http://www.arltma.com/Articles/CopperToxDoc.htm That and a few other places is where I started to read about copper and the problems it can cause. The issue of aldosterone was brought up by Ann Louise Gittleman at the Copper Dysregulation facebook group. I'll get a link to what she says about it. I have low aldosterone, though, I think, and frequent urination, and right now I'm trying to figure out if I actually have low copper.
Biounavailable copper is a cause of soft tissue calcification because copper regulates calcium deposition, I'll look for the best link for that info. Then up the chain from the copper is boron, which somehow regulates copper. I haven't found how it regulates the copper, though. But you can see by a list of all the things borax is good for that somehow it can even reverse the soft tissue calcification.
I am in the middle of trying to figure out if the frequent urination problem that I have is a result of a lack of arginine vasopressin or low aldosterone, and then while I'm at it, I aim to try to figure out where copper comes in to play. But an interesting piece of information that I just found is that arginine vasopressin actually acts in conjunction with corticotropin releasing hormone to modulate the release of corticosteroids from the adrenal glands in response to stress. I don't know yet if aldosterone is one of the corticosteroids that might be affected by lack of vasopressin. Lack of vasopressin would be a cause of very frequent night time urination.
One more tie in is that the lack of vasopressin can cause high blood calcium levels, which might mean that it's being pulled out of the teeth and bones, unbound copper would make it be deposited in soft tissue.
Because of all the reading I've done this afternoon it might take me a little bit of time to figure out good links, but I'll be back.