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This cobble drained an entire battery with a 36v Bosch... Believe it or not, Maple is comprised of some of the hardest rock on Earth.
ID 111973300

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Brenden Sullivan
Jul 4, 2016
This cobble drained an entire battery with a 36v Bosch... Believe it or not, Maple is comprised of some of the hardest rock on Earth.  
Stevie Nacho   Utah
peeing on the bush Jul 7, 2016
We were averaging almost two bits per pitch. The carbide smoked right off... I placed bolts in the matrix whenever possible without any tightening issues. I realize it might not be the hardest rock on earth but quartzite in general is extremely hard no matter where it forms, even harder than pure basalt. I have heard Big Cottonwood is a good place for new routing on a few different rock types... Jul 7, 2016
Aim for the matrix, not the cobbles when drilling. That is the stuff holding it all together. Having drilled down there a few times I can honestly say that stuff isn't the hardest rock on the planet/state. You should give some Big Cottonwood Canyon quartzite a spin! Jul 6, 2016

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