I think the title pretty much sums it up. This is a starter cave module, made using very cheap materials. If you have vein miner, then you can probably do this on day one.

Find yourself a sizeable mountain and then dig a hole to fit this 17x17x12 cube. I would dig near the base and maybe recess it a little to allow room for the entrance you make. (recess by at least one block)

This cave contains, early storage, a bedroom, a cooking area, a small farm and a cute little fountain. The back end of the cave has an opening, which is for your mineshaft (staircase going down)

I've lit up the base to prevent spawns and removed the outer blocks to reduce the material list down to the absolute minimum. Those areas are also lit up.

The trickiest block to find is probably the mossy cobblestone. I wen't back and forth on whether to remove it. Grass would of been the best block to exchange it with but, then you would need silk touch. So I kept the mossy cobble. Hopefully luck is on your side and you find some within a biome. Otherwise you just need some vines, moss or biomass mixed with cobblestone to make it. Mekanism's got you covered.

This was made in 1.18.2, but it's super simple to convert it to other versions. I made a guide on how to do this which, is located on my discord. Pinned to the help channel.

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Schematic: https://gist.github.com/moomoo84/e2b1b281854f0db5381563ced2169a34

Gallery: https://imgur.com/gallery/UDb2UR0

Materials: https://gist.github.com/moomoo84/f54515c241bc38cb5c073f79168a3ca3

Overall dimension: 17x17 and 12 tall (remember to push it back by at least one more block into the mountain)

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Building Gadgets Version: 3.13.2-build.21 mc1.18.2

Portfolio: https://docs.google.com/document/d/1TI0HVpA7SOZAG_SdMoirWTIOl1tVSwCstSbviwJLPOY/edit?usp=sharing

Discord: https://discord.gg/r6V28h8grJ