The billionaire founders of ENRC ( id="symbol_ENRC.L_0"> ENRC.L ) are close to finalizing a buyout bid for the London-listed Kazakh miner, valuing the troubled group at just over 3 billion pounds ($4.7 billion), below the value of a tentative proposal made in May. ENRC's co-founders - Alexander Machkevitch, Alijan Ibragimov and Patokh Chodiev - and Kazakhstan's government are seeking to acquire the roughly 46 percent of ENRC which they do not already control, offering cash plus the government's shareholding in Kazakh mining rival Kazakhmys ( id="symbol_KAZ.L_1"> KAZ.L ), also listed in London. The founders want to take the group private after more than five years of bitter boardroom battles, corruption probes and an acquisition spree that left $5 billion of debt. In a statement on Sunday, a day ahead of the deadline for making a firm offer, the bidding consortium said it was "in the advanced stages" of preparing an offer worth $2.6