There has been a class action lawsuit filed in California against the people who bag the Ironite. Seems that it contains a bunch of heavy metals that are not listed. Here is a link
http://www.envirolaw.org/poison.html that you can check out. Here are some figures for you. Note that these are levels that Ironite claims it contains:
Arsenic4380 ppm
Lead 2910 ppm
Also check out this page for more info
http://agr.wa.gov/PestFert/Fertilize...iewTable<r=I
Have fun.