A sawmill in British Columbia could be forced to halt production within days as its remaining log inventory runs out, adding to the pressure facing the province's lumber industry amid constrained fibre availability and difficult operating conditions.    The Valemount Industrial Park sawmill, operated as part of Valemount Community Forest Ltd. in Valemount, BC, had only around 15 to 20 operating days of logs remaining at the end of July and no new logging contracts in place to replenish its supply.    At a July 29 board meeting, the remaining inventory was estimated ...