P524ORACLE 524 Mon 3 Mar C4 1707:03   HUNT FOR GOLD  IN THE HIGHLANDS Two Canadian companies are to start drilling tests for gold in April in the Scottish Highlands. The Colby and East West Resource Corps say tests last year were "very encouraging" and now hope to confirm at least one commercial gold zone The man heading the five-man geological search team in the Loch Tay region is Bob Middleton.  Ennex Int says it has found strong indications of sufficient reserves to support gold mining in Ulster's Sperrin Mountains. * HAVE A HOLIDAY * 580