Minerals Crossword

elements or compounds of elements that occur naturally in Earth's crust
the extraction of mineral and energy resources near Earth's surface by first removing the soil, subsoil, and overlying rock strata
the extraction of mineral and energy resources from deep underground deposits
soil and rock overlying a useful mineral deposit
a hill of loose rock created when the overburden from a new trench is put into the already excavated trench during strip mining
the process in which ore is melted at high temperatures to separate impurities from the molten metal
pollution caused when sulfuric acid and dangerous dissolved materials such as lead, arsenic, and cadmium wash from mines into nearby lakes and streams
mineral deposits that have been identified and are currently profitable to extract
any undiscovered mineral deposits or known deposits of low grade ore that are currently unprofitable to extract
conservation of the resources in used items by using them over and over again
conservation of the resources in used items by converting them into new products
a manufacturing system based on industrial waste minimization