So basically all plants are miners. They mine macro nutrients (N, P, K) and micronutrients (Zn, Mn, Fe, Cu, Mo, and Cl) from the medium they grow in, and sometimes through their leaves. These technically are not plant food as plants feed themselves by producing their own glucose in a reaction called photosynthesis. The macro/micronutrients are catalysts for this reaction…
6CO² + 6H²O + Sunlight----> C⁶H¹²O⁶ + 6O²
Carnivorous plants grow in nutrient depleted soil, but there are still traces of them. They are extremely efficient at mining these thus can survive without insect prey. They are so efficient that regular soil will cause severe nutrient burn and kill them. They do get extra nutrients by trapping insects in their leaves and typically do better with it, but can go without prey because of this.