** Bowen Coking Coal BCB.AX slumps as much as 29% to record low of A$0.071; last down 22%
** Co gets letter of demand from BUMA Australia Pty for payment of invoices totalling A$15.3 mln ($10 mln) by midday July 16
** Co considering whether continuing commercial negotiations, recapitalisation efforts with BUMA remain viable
** About 1.7 million shares traded, 2.8x the 30-day average
** BCB loses 90.3% YTD
($1 = A$1.5284)
(Reporting by Sherin Sunny in Bengaluru)
((Sherin.Sunny@thomsonreuters.com;))