Sand, gravel, and silt are the main constituents of the alluvium, with the coarser material deposited near the head of the fan. Organic matter is also transported, making the soil highly fertile. Valuable minerals such as cassiterite (tin ore, SnO2), diamonds, gold, and platinum are often found in alluvial fans.
Related entry• delta
Related categories• GEOGRAPHY
• GEOLOGY AND PLANETARY SCIENCE
Source: U.S. Geological Survey
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