Article: Tri-State and Viburnum Trend Districts.

AN OVERVIEW

The Midwest contains two of the greatest concentrations of zinc and lead in the world. These are the Tri-State district of Oklahoma, Kansas, and Missouri and the world-class Viburnum Trend of southeastern Missouri. Deposits in both of these districts are of the Mississippi Valley-type (MVT). Such districts have a number of characteristics in common:

* The host rock is dolomitized limestone.

* The mining district is on a dome or arch.

* Mineralization is confined to stratigraphic units.

* Temperature of mineralization was 100 [degrees] -200 [degrees] C.

* There are no nearby or associated igneous intrusive ...

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