Edgy,

no problem with open pit and permit. Open pits are all over the place and in modern gold as well as oxidic copper ores it is often the norm. It depends only on the orebody shape and proximity to the surface.

Tailings are more of a problem, but that is not an issue for oxidic chromite ores as long as they do not contain sulfides. If the chrome ores contain minimal sulfides, open pit should be simple, cheap and environmental acceptable. Although I do not know the full composition of the ores, hopefully the chromite ores just contain oxides and no sulfides, since that also will affect the ferro-chrome smelting process.

After closure of the mine, they may have to backfil, level and vegitate, but pretty standard.