Sedimentary exhalative deposits
（重定向自SEDEX）
![Copper ore from the sedimentary exhalative deposit at Rammelsberg, Germany](/Images/godic/202502/10/Kupfererz-rammelsberg_hg2012.jpg")
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Sedimentary exhalative deposits (SedEx deposits) are ore deposits which are interpreted to have been formed by release of ore-bearing hydrothermal fluids into a water reservoir (usually the ocean), resulting in the precipitation of stratiform ore.
SedEx deposits are the most important source of lead, zinc and barite, a major contributor of silver, copper, gold, bismuth and tungsten.