** Platinum miner Lonmin's shares up 15 pct aftersaying it cut 5,108 jobs after its restructuring
** S.African union had said on Wednesday that only 75 jobswould be lost at co
** Co top FTSE small cap gainer ; more than half ofits 30-day avg vols gone through by 1015 GMT
** Shares have fallen to about 1 percent of their valuesince 2011 as platinum prices tumble, costs rise (Chart: http://bit.ly/1QtGwvn ) (venkateshasoumithri.mamidipudi.thomsonreuters.com@reuters.net)