BEIJING, Jan 22 (Reuters) - London copper prices edged down on Tuesday, extending a sharp drop from the previous session after economic growth in top metals consumer China slowed to its weakest in 28 years. FUNDAMENTALS * LME COPPER: Three-month copper on the London Metal Exchange was down 0.2 percent at $5,971 a tonne by 0207 GMT, after ending down 1.2 percent in the previous session. * SHFE COPPER: The most-traded March copper contract on the Shanghai Futures Exchange fell by 0.8 percent to 47,590 yuan ($7,003.58) a tonne, snapping four straight days of gains. * COPPER: The global world refined copper market showed a 15,000-tonne deficit in October, compared with a 161,000-tonne deficit in September, the International Copper Study Group (ICSG) said in its latest monthly bulletin. * ZAMBIA: Barrick Gold Corp said on Monday that it was considering all options for the Lumwana copper mine in Zambia as the African nation's proposed new mining taxes would make it challenging to generate adequate returns for all its stakeholders. * WAREHOUSING: Years after sweeping reform aimed at eliminating logjams in warehouses that collect rent for storing metal, a firm is preventing companies from getting material when they need it from a Malaysian port, five sources close to the matter said. * ZINC: The global zinc market deficit widened to 96,600 tonnes last November from a revised deficit of 52,000 tonnes in October, data from the International Lead and Zinc Study Group (ILZSG) showed on Monday.