First off my problem is incredibly similar to this thread where the answer was almost reached but wasn't fully finished. Accidently deleted some small sized partitions when installing WIndows(Bootcamp). OSX Partition wont boot
I did the same thing, when I went to install Windows I saw four partitions two large ones: OSX and Bootcamp and two small ones which I thought I accidentally created. Unwittingly I deleted the two smaller ones via the windows installer, I now believe they were the recovery and EFI partitions. Anyhow when I went to reboot holding the option key there is nothing bootable that shows up, just a blank grey screen.
I did the cmd+opt+R and tried to reinstall OS X in place but the OS X partition isn't mountable. I also ran some things in Terminal to give a better idea of what's going on.
I have very important files I need to get to so reinstalling isn't really an option, I need to fix this and make it bootable or need to do data recovery. Any input is very welcome! Next time will use Time Machine....