How was this low-grade gypsum supposed to be addressed in the original EIA? If HRH were not to pursue use of the low-grade gypsum, would it then become backfill at the end of project life? What was the original plan to address this low-grade gypsum?

Low-grade gypsum has been, and will continue to be,  used to construct and maintain site infrastructure. Any excess material is to be treated like other overburden on site, either stockpiled outside the quarry footprint or left on the quarry floor. This was always the plan in the original EIA but other opportunities have arise for the product that were not originally identified. The additional change to the actual operation is so minor that HRH has decided to explore a good end use for this low-grade gypsum.