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Mineral deposits are said to be produced at the Earth's active centers. These centers are the location where hydrothermal circulation is present. The presence of hydrothermal circulation relates to the temperature gradient. The higher the temperature gradient, the nearer the magma chamber is to the surface of the earth. 

Trenches and volcanoes are products of plate tectonic movements which creates hydrothermal activity and results to the formation of metallic deposits.
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