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Bolting Quartz Arenite?
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NJSlacker


Feb 2, 2010, 5:47 PM
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Bolting Quartz Arenite?
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Hey all

I wish I knew a little more about geology before I decided to pick up rock climbing...

Anybody know how hard Quartz Arenite sandstone is, and what kind of bolts are appropriate in it? I know that generally you want to glue-in for sandstone, but I hear this type is mostly quartz.


areyoumydude


Feb 2, 2010, 10:35 PM
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Re: [NJSlacker] Bolting Quartz Arenite? [In reply to]
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NJSlacker wrote:
Hey all

I wish I knew a little more about geology before I decided to pick up rock climbing...

Anybody know how hard Quartz Arenite sandstone is, and what kind of bolts are appropriate in it? I know that generally you want to glue-in for sandstone, but I hear this type is mostly quartz.

The quartz I've encountered is about the hardest rock to bolt (Ibex in Ut and Tamo in AZ). You'll wear out your drill bits in one to three holes. Expansion bolts work fine.


mrtristan


Feb 3, 2010, 4:15 PM
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Re: [NJSlacker] Bolting Quartz Arenite? [In reply to]
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Yeah I don't know exactly what quartz arenite is, but quartzite is freaking HARD. Harder than granite. I get two or three holes per drill bit in the stuff. If your quartz arenite is that hard, regular expansion bolts will be fine. Glue-ins won't be necessary.


joeforte


Feb 3, 2010, 5:02 PM
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Re: [NJSlacker] Bolting Quartz Arenite? [In reply to]
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There are many different grades of quartz arenite, and depending on the matrix or clast percentages, they require different types of bolts. I live near you, so maybe you can just describe what area, formation, or rock member it is.


NJSlacker


Feb 3, 2010, 5:28 PM
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Re: [joeforte] Bolting Quartz Arenite? [In reply to]
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specifically, I'm looking at a range of shortish cliffs that run along a ridge above the Juniata River, in Huntingdon PA. I'm looking into getting official permission from the Huntingdon borrow to climb there, and part of the plan may involve putting in toprope and rappel anchors as the trees are so far from the edge of the cliffs.


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