Limestone

Original-map Strata 2 Limestone Vein at X78/Y216, the first listed limestone location.

Before you go

Access to Strata 2 after the elevator gate.
Standard Pickaxe for hand collection, or a Mining Drill for automated extraction.
An inventory or container buffer for the collected limestone.

Open the original-map resource listing and select the Strata 2 limestone entry at X78/Y216.
Reach the site through the cave passages you have opened, then identify the visible limestone vein.
Mine the deposit with the Standard Pickaxe for immediate materials.
If a Mining Drill is available and its placement requirements are met, use it to extract the vein automatically.
Bring the limestone to the factory and store it separately from ore and processed materials.
Check the Smelter or other current construction panel to confirm how much limestone the next build requires.
When this deposit is depleted, use the listed Strata 3 vein at X126/Y252 as the next recorded location.

The database lists locations and extraction methods, but no deposit sizes or respawn timing.
Keep some limestone uncommitted until you have checked the recipe panel for the machine you intend to build.

Repeat by extracting from an available limestone vein. Deposits are finite; once one is exhausted, move to another listed stratum location.

Assuming the vein is renewable: plan to develop another site after depletion.
Hauling material without a recipe goal: check the intended build’s current requirements first.
Treating ore and limestone as interchangeable: keep separate buffers and follow each recipe panel.

Stop at the site when it is depleted or you have enough for the planned build; continue at another listed limestone location only if demand remains.

Sources & fact checks

Open a guide to find other locations and see what the item is used for.

Ores and materials

Limestone is a construction material for early smelting infrastructure and other factory needs.