From the website19 Dec 2017 18:28
It is intended that as Pokrovskiy nears the end of its mine life, the mine and its related infrastructure will transition into the site for the POX Hub, which is currently under construction. The POX Hub is an integral part of the Group’s future plans in allowing for refractory gold production and Pokrovskiy provides an important strategic location, not only due to its on-site and regional infrastructure, but also its close proximity to Pioneer’s limestone deposit, limestone being a key ingredient for the pressure oxidation process to be used at the POX Hub. The POX project comprises the construction of the POX Hub, which is expected to be commissioned in the fourth quarter of 2018, the refractory ore flotation plant at the Malomir mine, the first stage of which is expected to be commissioned by the end of 2017 (with the second stage expected to be commissioned in 2019), and the refractory ore flotation plant at the Pioneer mine which is expected to be commissioned in 2023. These flotation plants are intended to produce concentrate to be delivered to the POX Hub for processing. The POX Hub may also process concentrate sourced from third parties. I like that last one as an additive to our own gold. It also mentions in other parts Banking covenants which I have alluded to before.