Modern mining equipment offers better output than older (or used) models, as well as better rates and yields. The ability for units to extract minerals with less energy per revolution reduces the overall cost of the machinery, which increases your ROI over the long run. On top of that, the use of vibration, in combination with grinding media, significantly increases the number of material impacts per minute, decreasing extraction time and creating a more desirable fractured product. The ability to extract ore and minerals quicker allows units to process material more efficiently than older units, so retention time required to extract material is significantly reduced. When looking for equipment, look at energy per revolution, impacts per minute, extraction time, and so forth((Kinematics, 2019)).
What other factor do you consider when getting your mining equipment? Please comment below.