## 1 Introduction
There is no mention of the abolition of complex simulators covering unique processes or objects. Their construction is different for the most part, or they completely consist of separate modular block functional parts, simulating a simpler functionality. Paper [30] presents the development of an integrated infrastructure simulator for sustainable urban energy optimization and its application. This simulator consists of several modules according to the business model with the management strategy applied in Hamamatsu city (Japan). The work [31] explores an immersive VR-based safety training simulator that allows for procedural training to electric overhead crane (EOT) operators. The combination of simulation and VR technology is a typical solution for safety simulator. The explosion in digitalizing is prompting producers to move urgently to adopt new technologies. Unfortunately, the economic impact of digitalization is often difficult to measure. First of all, this is due to the prolonged effect of the introduction of various digital tools. The article [32] shows that the explosive spread of digitalization affects the sustainability of specific advantages. However, this effect may be transient and may last until either a more \"advanced\" product appears on the market, or until the technology is no longer needed. On the other hand, the same paper shows another version when digitalization has \"a winner takes all\" effect. In the first and in the second case, the effect is difficult to measure, because it is impossible to determine the time during which one or another digital technology will be \"on top\", and it is difficult to determine the time of winning over everything. Decision-makers are faced with enormous development and implementation costs, which overshadow the effect, especially when it is intended for the long term. The simulator will help to train staff, and can be a testing ground for new solutions related to production digitalization. For example, paper [33] emphasizes the urgent need to develop the next generation of pedagogical simulators. These simulators, according to the authors, should be simulators that combine today's best practices (commonly used as part of bachelor and master curriculums of chemical and biochemical engineering, and are: PRO/II, Aspen Plus, Hysys, SuperPro, specific simulators that have been created as learning tools for undergraduate engineering and science students, such as BerryMaker or Labster ApS., and others like that). Thus, simulators based on dynamic models of different parts of the production cycle and the training of specialists will significantly increase profits and reduce costs for enterprises [34; 35]. Such implementations will clearly present to decision-makers the benefits of adopting a particular technology. This will improve the observability of the results of digital technology applications, and will practice the solutions developed without affecting the existing production. For instance, the work [36] shows one of such simulators, DeConSim, which is an ideologically close analogue to the simulator developed by the authors. A distinctive feature of this simulator is the ability to work in two different modes: simulation and real-time mode. This approach allows us to move from a simulator to a modeling tool underlying the control system at different levels. Mining processes are divided into a number of stages and process steps. One important stage is the beneficiation process. The most common method is flotation for valuable metal ores [37; 38]. This method, which is founded on the principles of material separation based on the wettability of the mineral surfaces, is both versatile and can be applied to a wide range of raw material types using a variety of reagents [39]. The purpose of this paper is to develop a dynamic model of the flotation process at a gold mining enterprise, to form criteria for assessing the suitability of this dynamic model for use in a digital training simulator and to evaluate the developed model against the formed criteria.