Found Deceased Spain - Julen Rosello, 2, fell into narrow and deep borehole, Totalán, 13 Jan 2019

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Hatfield said:
To explain why the sideways tunneling is harder than going straight down.

When they dug the 2nd hole they used a drilling rig truck that had all the drilling equipment and drill pipe column to go straight down.

Going sideways in this last phase is a whole different animal. The workers basically had to use special hand tools like jackhammers and maybe a hydraulic water drill which can drill through rock using a fine high speed jet of water that can cut through the rock.

It is a slow process because they dont have the luxury of the drilling rig truck that was used before to go straight down. This is why they are also using small explosions to break apart the rock and it makes their efforts easier to go sideways.

Someone earlier shared a link that indicated the hard rock that they have to go through is Quartzite which is a hard rock to get through.

Quartzite is described below:

"Hardness In its pure form, quartzite can at times be harder than granite. However, since it goes through compression with sandstone and other minerals, there is often variation in the stones hardness. Some quartzites can be harder than granite and others can be soft as marble."

https://ariastonegallery.com/what-is-quartzite/
Click to expand...
It sounds as if these bits of quartzite or whatever the hard rock is, is in sheets, like they'll make progress and then run into another curtain of it.
 
Mom24 said:
It sounds as if these bits of quartzite or whatever the hard rock is, is in sheets, like they'll make progress and then run into another curtain of it.
Click to expand...

That would make perfect sense because formations of rock varies all the time. Most people are familiar with how gold miners found gold in "veins" and they would have to follow the vein into the mountain and mine out areas in the direction of the vein.

Same with any other type of rock formations. It can vary greatly depending on which direction it goes.
 
They are close and mentioned the need to use more explosives.

ETA: He mentioned Quartzite and that the fourth explosive needs to be precise because of the close proximity to Julen.
 
cybervampira said:
https://www.facebook.com/video.php?v=352074122188099
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Going over the conditions of the issues they have run into, how they expected to have completed this by now, how the explosives work, the number of news agencies from around the world waiting for information. Nothing really new. Tremendous specialists who are working on this, where they are from, how precise they need to be and how complicated the work is.
 
Any time I was on a geological dig, there were many precautions we had to take when quartzite was present - because of the strength and force of it.

I cannot even imagine how they are calculating the "preciseness" of these explosive operations. My deepest respect for their courage and deep commitment.

"The quartz content of quartzite gives it a hardness of about seven on the Mohs Hardness Scale."
Quartzite: Metamorphic Rock - Pictures, Definition & More
 
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