Caliche

I don't understand the question-

How far did they tunnel through caliche?

Or did they put caliche in tunnels?

Or something totally different?
 

I think caliche is a calcium deposit and they use it in cement making,unless you are in Peru...then its a salt deposit.
Unless this is something used for mining.....I think they meant cache.
 

When they would seal the mine they would make and use caliche,right? How far in the tunnel would they put it?
 

6' should do it. Sometimes more depending on how sealed they want it. Usually they backfill the hole with dirt, then use caliche the last 6'-3'

Where do you plan on digging? ;D
 

Caliche is a poor-mans concrete and is naturally formed. It is a term for calcium carbonate (CaCO3) that forms in sediments or in voids and crevices within bedrock just below the surface in semiarid regions, as a result of soil-forming processes or ground-water evaporation.

It is usually a material left behind by evaporation of ground water.

The layers are a few inches to several 4 or more feet thick, and acts as a percolation barrier of soil from precipitation or artificial watering.

The majority of the soil in the Las Vegas area is underlaid with a lense of caliche which must be exposed and/or penetrated to facilitate runoff and for planting or large shrubs and trees.

There is a chance that this material was man-placed in a tunnel for whatever purpose.
 

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