http://www.canyoneering.us Tue, 10 May 2011 12:38:44 +0000 en hourly 1 http://wordpress.org/?v=3.1.2 http://www.canyoneering.us/bolt-selection-by-rock-typestrength/ http://www.canyoneering.us/bolt-selection-by-rock-typestrength/#comments Tue, 04 May 2010 03:10:11 +0000 rcwild http://canyoneering.us/?p=509 Added a new PDF to ACA Canyoneering. It presents simple means field tests for determining the compressive strength of various types of rocks, along with recommendations for mechanical and glue-in bolts for each type. “Bolt Selection by Rock Type/Strength” is available to Silver and Gold members.

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