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0 <br />• <br />Appendix F <br />Relationship Between Hardness, Consistency <br />and Uniaxial Compressive Strength <br />Approximate <br />Range of Unconfined <br />Com ressive Strength <br />Hardness <br />Consistency <br />Field Identification <br />PSI <br />MPa <br />SOILS AND FAULT GOUGE <br />S1 <br />very soft soil <br />Easily penetrated several inches by fist <br /><3.5 <br /><0.02 <br />S2 <br />soft soil <br />Easily penetrated several inches by thumb <br />3.5-7 <br />0.02 -0.04 <br />S3 <br />firm soil <br />Can be penetrated several inches by thumb <br />7-14 <br />0.04 -0.1 <br />with moderate effort <br />S4 <br />stiff soil <br />Readily indented by thumb but penetrated only <br />14-28 <br />0.1 -0.19 <br />with great effort <br />S5 <br />very stiff soil <br />Readily indented by thumbnail <br />28-56 <br />0.19 -0.39 <br />S6 <br />hard soil <br />Indented with difficulty by thumbnail <br />> 56 <br />> 0.39 <br />ROCK <br />RO <br />extremely soft <br />Indented ndented by thumbnail <br />28 - 100 <br />0.19 - <br />0.69 <br />R1 <br />very soft rock <br />Crumbles under firm blows with point of <br />100-1,000 <br />0.69— <br />g eologic pick, can be peeled by a pocket knife <br />6.9 <br />Can be peeled by a pocket knife with difficulty, <br />1,000- <br />6.9— <br />R2 <br />soft rock <br />shallow indentations made by firm blow of <br />4,000 <br />27.6 <br />geolo ical ick <br />Cannot be scraped or peeled with a pocket <br />4,000- <br />27.6— <br />R3 <br />average rock <br />knife, specimen can be fractured with single <br />8,000 <br />55.2 <br />firm blow of hammer end of geological pick <br />R4 <br />hard rock <br />Specimen required more than one blow with <br />8,000- <br />55.2— <br />hammer end of pick to fracture it <br />16,000 <br />110.3 <br />R5 <br />very hard rock <br />Specimen required many blows of hammer end <br />16,000- <br />110.3— <br />of geological pick to fracture it <br />32,000 <br />220.6 <br />R6 <br />extremely <br />Specimen can only be chipped with geological <br />>32,000 <br />>220.6 <br />hard rock <br />pick <br />• NAPROJECTS\ACTIVE PROJECTS \1158520037 RioTinto CollomPennit \Draft Pennit Text Tables MapPDFs\Exhibits \Exhibit 6 Item 7 - Geology Pre - Feasibility <br />Report\Appendices\Appendix F - Protocols\liardness_tbl.doc Page 1 of 1 <br />1/16/2009 <br />