世界上有許多在工業上具有特殊意义的稀土元素、稀有金屬和貴重礦物如:独居石、铌、钽、鈳、錫、鎢、黄金、白金、金剛石等。由於化学性質稳定、硬度和比重較大,往往富集成比原生岩漿礦床更有價值的砂礦。如世界有名的金剛石礦,就多半是砂礦。因此普查和勘探砂礦就成为非常重要而富有意义 There are many industrial rare earth elements, rare metals and precious minerals such as monazite, niobium, tantalum, gallium, tin, tungsten, gold, platinum, diamond, etc. that are of special significance in the industry. Due to its chemical stability, high hardness and specific gravity, it is often enriched in ore that is more valuable than primary magmatic deposits. Such as the world famous diamond mine, most of the sand mine. Therefore, census and exploration of sand has become very important and meaningful