See 15:00 in the now-available Denver Presentation. Hoisting and Processing capacity is double the feasibility mining rates so this foreshadows Golden Star's ability to increase production should they discover more reserves.
The only thing prior to the 15:00 mark that is important is that Prestea has produced 9M ounces over 100 years and there are "very few ore bodies that have produced that over such a short strike length". Feasiblity mining rates are 6500 TPD and they can hoise 1500 TPD.
The production growth GSC.TO (25% to 2019) looks attainable.