many deposits of lead and zinc are associated with silver and are found in submarine settings that formed in association with volcanism, forming a type of deposit known as a sEDEX (sedimentary exhalative) deposit. These tend to be associated with the fringes of large volcanic flows or on the margins of subvolcanic plutons, with many examples located in the superior craton of Canada and others in Australia. Another, quite different type of lead-zinc deposit is found as metalliferous layers that replaced primary carbonate layers; the world's largest deposit of this type is found in the central united states in missouri, in the mississippi valley lead-zinc deposit belt.
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Preparing for Armageddon, Natural Disasters, Nuclear Strikes, the Zombie Apocalypse, and Every Other Threat to Human Life on Earth. Most of us have thought about how we would handle various types of scenarios that could signal the end of the world. There are plenty of movies on the subject, psychological papers, and even survivalists that are part of reality TV shows. Perhaps you have had dreams about being one of the few left and what you would do in order to survive.