Mobile Miner allows you to cool, thicken and enforce the crust.
It allows you to extend the mining from the ground level and mountains to the crust

In the table you see the forms of elements in the mobile miner and at around 2 000 C.
All stones, rocks and lava is said to be in liquid form at 1200C, and solid form at 600C.
- With carbon cauldron it is possible to melt all the other elements and vaporize most.
- With wolfram wires, you get electricity to miner.

- It seems that Yttrium is actually Titanium. Nickel and Cobalt have also matching capabilities.
- Radio active Francium is obviously a form of Cesium, which has two atoms ( Cs₂ )
- From table you see also how different the farm-field enhancer equivalents in the looks are. Potassium melts at 63C. It converts into gas, when Ca and Mg converts into liquid.

Complete miner needs gas tower for the elements, which converts to gases at 2 000C. Silver is the only commonly mined thing, miner is near to convert into gas.

Collection of valuables could be made with cauldron, into which you lead the liquid rock. Then you wait until the valuables searches weigh based places in the cauldron.
If you need clean elements, you can mold the collected element into sand like small balls. These golden balls can be later processed with CO₂ furnace like system, where you raise the temperature and collect the liquids with melting. 

You can use the melt separation system also with the mobile miner itself.  Melting in miner needs that major component melts before minor component. Usually major component is rock, and minor a stream of valuable element.

Keeping the cauldrons hot is not very big thing, miner spreads heat to everywhere.

When you miss the valuables or have bigger field, you cast the liquid directly to blocks.
All jewels are carbon constructions, you get them with filter, that separates solids from liquids.

Cauldron collection needs at least two cauldrons. One that stabilizes and another into which you lead new material.

The initial hole's diameter must be 10m or more. Railroad car sets must be capable of going up and down in the hole.
The surrounding 3-6 meter, slice where you take loaded cars up, need carbon-plate based support system at the miner unit.
The hole needs also a support system for keeping the walls up, until the hole is cooled / or it cools down.

You can find valuable fields and streams from 10 km depth as well as from near the ground. Or from the mountains.

When you find a stream or field from the hole, you follow it with horizontal miner.
The horizontal hole must be wide enough for incoming and out coming track. Or then you need passing points in the tunnel.
Horizontal machines front must hang in the air. Front must keep the tunnel open with supports, until the cooler unit.

The length or depth of the liquidized area is never very big.

In the new world you or your refinery gets more iron, copper and tin from trash plants than mines. Over 80% from the valuables are recycled after usage.

We don't know much about the crust. Lava never shows in earth quakes, only in eruptions. And obviously also in continental splits.
We know that there is ground water layer. Lava is a match to crust. Depth of crust is estimated be around 30 km. And that's all.