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From: "Jim Wilkins" <muratlanne@gmail.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: cordless tool 18V to 12V converter
Date: Fri, 8 Mar 2024 11:10:48 -0500
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"Richard Smith"  wrote in message news:m1frx0reyj.fsf@void.com...

"Jim Wilkins" <muratlanne@gmail.com> writes:
>
> The only way I've seen was with the hydraulic jackhammer on an
> excavator, and it could take perhaps an hour to crack a large granite
> boulder left from blasting and meant for fill. They drilled to blast
> but not to break up the rubble.

So you saw unusable stone - for some reason - shape, flaws, etc.? -
which they had to break-up?

------------------------------

That was at a construction site where they were smoothing very uneven 
terrain enough to build houses on. They blasted the ridges to fill in the 
gulleys and named the development in memory of what they had destroyed. A 
machine like this crushed much of the rubble to gravel, sharp-edged like you 
want instead of the glacial-runoff-smoothed gravel in the ground here.
https://www.quarrymagazine.com/2020/03/19/selecting-the-right-crusher-for-your-operations/

The relatively little flat land here is mostly already developed. New 
Hampshire is the "Granite State" for good reason, it somewhat resembles the 
Scottish Highlands, even to the caber tossing.
https://nhscot.org/highland-games-nh/
Notice the background mountains. The site is a ski resort.