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<br />gL1G. 1.12000 12.56PM DIViMINERgLS8GE0LOGY N0.317 P. Sib <br />1 <br />2'able 1. Rock clasaitieation based on unconfined eompzassive <br />atreng*-h. ~ _ <br />No. fkacriprra Unlasial cpnprauive strength i~anpl~•' <br />lblm' kyad 1.0?s . <br />Sl 'VERY SOFT SOII. • easily oplded ~6 <0.~ x.04 <br /> wi0r fingers, show distlael <br /> heal tmeks. <br />52 80F7' St7II. • molds wish cCaog 510 0,40.8 O.OM-0,08 <br /> pfessme dram was, ahem <br /> faioi bell aerks. <br />sI p'AatsoQ.•.vyaicEedtto la2o o.e-l.s o.og-o.la <br /> mold wish Gngess, tndmusd <br /> trial Qn6a oail,dc!<icull b <br /> col with Lod spade, . <br />34 Sl'¢FS01L-meaWbemoldad ~ 20-80 156.0 0,15.0.60 <br /> rrilh Unglfi, tat4101 be q4 . <br /> vlth band tpadq taquicea band <br /> pid:inf fac a¢snlloa <br />SS VERY S71FF SOII. • ray longl4, 801so 6.10 0,61.0 <br /> 6iffiedt b able N'Iih bond ' <br /> pick ptxontslic spade tsquired <br /> fa ormnlloa , <br />Rl YERYWE1tCROCIG-amableyaoder 150.3500 10-250 S,is <br /> slwp, blows wllb gmlo;leel <br /> pick point can be rat wllh <br /> packet knife <br />R2 MODERATELYBYFNCROCK-sballow 35007500 250-Soo 25.50 <br /> wls a scraping wilh pocket <br /> knife rhOt diIIicvlry. pick <br /> point iadmla dap1Y wilh Lem <br /> blow. <br />R] MODFRATEI.Y STRONG ROCK-knife 7500- 5001000 50.100 <br /> e>varo{ b. ttsed la serape a 1 soon <br /> pad sor4ca shallow lodmu- <br /> boos trade llcmblowfrom pld; <br /> point <br />Cbplk cockWt <br />~~ <br />NtataK <br />Smrlpooe, sLk <br />sltela <br />R4 . ' STRONG ROCK • band•bald sample 15000. 1000.2000 100200 SAsebia, grmiu, <br />6eeeks with one firm blow fiam 30000 pdn . <br />bemtna and of gmlogital pick ' <br />RS VEINSfMONOACCK-tsgrdw x30000 >2000 >100 Qaatata6olaite, <br />many blows Sam geological pint gebbea, basdt <br />b beak mlael sample. - . <br />From: Hoek R Br+y, 1951; Dace R Milla,1966; <br />Pilau, 1971 and RobeAsact, 1971 <br />