Create a fully underground automati...

Create a fully underground automatic mine in Minecraft Java Edition with a natural cave entrance. The entrance is inside a large natural cave. A wide stone stairway is carved directly into the rock (no ladders), going down naturally as if formed by erosion. The stairs are uneven and rough, made of stone and andesite. The mine below is a large underground cavern with a natural shape. Stone, andesite, tuff, and deepslate walls with visible ore veins. Auto-mining systems (rails, minecarts, hoppers) are integrated into the cave and partially hidden in the rock. Lighting is soft and warm using glow lichen, lanterns, and torches. Moss and vines grow on the walls. Everything feels natural, immersive, and not artificially built.