Maui’s beaches are losing sand: Maui native sand has taken tens of thousands of years to form, and has been lost through direct human activity at an alarming rate. Sand mining has occurred since before WW2. Sand mining operations at Spreckelsville area saw the digging out of precious coral sands from the local beaches, to feed the HC&S lime kiln near Paia for about 70 years. A huge amount of Maui sand is mined from inland sand dune stocks too, and the majority is exported to Oahu for cement production. Over 70% of Maui sand mined is sent to Oahu.