Dear developers, thank you for your excellent game.

It would be realistic for mining operations to add danger to them (in reality, these are very dangerous and responsible works that need to be carefully planned), and therefore I propose to add, when setting up the complexity, the filling of excavators and other pieces of equipment with bulk material, which would not allow them to be used until they are completely removed from under the embankment. Here he is excavating a rock mass in the face, and it crumbles on him - a very unpleasant phenomenon. This should motivate the player to plan mining operations in an accessible manner for the safe excavation of the rock mass from the face, taking into account the prism of a possible collapse (which, in my opinion, would also be worth adding, so there will be more demand for retaining walls, when the edge of the site could crumble when a building/equipment is located, depending on the weight at the edge in front of the edge of the slope). And for balance, a system with retaining walls could be improved:

• Iron - 5 units of height (or made of steel, but of moderate cost);
• Steel - 10 height units (but the cost of steel should be significant);
• Composite - 15 height units;
• Titanium - 20 height units.