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Gold/Mining/Energy : International Precious Metals (IPMCF)

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To: Bob Jagow who wrote (24941)	11/8/1997 3:11:00 PM
From: E. Charters	Read Replies (1) of 35569

Tyler Standard Screen Sizes. Sieve Sieve Nominal Tyler Designation Opening Wire Diameter Screen opening wire micron tyler mm in mm inch mesh 75 um No. 200 0.075 0.0029 0.053 0.0021 200 mesh 63 um No. 230 0.063 0.0025 0.044 0.0017 250 mesh 53 um No. 270 0.053 0.0021 0.037 0.0015 270 mesh 45 um No 325 0.045 0.0017 0.03 0.012 325 mesh 38 um No. 400 0.038 0.0015 0.025 0.001 400 mesh WE see that 400 mesh is 38 microns or about 1/1000 of an inch in size. This is the limit of normally quoted screen. Further sizing is usually done by elutriation. Power to get to those sizes depends on thr Bond's work index of the ore. Silicate matter falls into the 18 to 26 range. Beyond certain size ranges the bond index is not operative as the work increases geometrically because of surface tension adherance becoming a large force to overcome to break or separate particles. Thus it is not practical to try to grind particles beyond a certain limit except in the softest of ores, as in talc. --------------------------------------------------------------

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