Gypsum - mineral (primary zinc production from concentrate)

Emissions generated by the activity within the product supply chain as described in ecoinvent v3.10. The product "gypsum mineral" represents the natural mineral CaSO4 * 2 H2O milled. It is mined together with anhydrite rock in open pit mining. The output of the mine is crushed and sorted. The intermediate products are composed of about 65% natural gypsum (CaSO4 * 2 H2O) 34% natural anhydrite rock (CaSO4) and 1% soil and gravel that are deposited back in the mine. The material is gained by blasting and digging. Gypsum is used by the cement industry; as a filler in the paper industry and as raw material for (burned) anhydrite and stucco. The cut-off classification is allocatable product. The activity type is ordinary transforming activity. The reference product amount is 1.