Western Copper and Gold is trading 6.11% up in pre-market at $1.91, compared with its October 19 close of $1.80; the available evidence does not establish a catalyst for the move. - No fresh company-specific announcement explaining the move appeared in the sources reviewed; the company’s latest listed news was dated September 14. - Copper prices were reported lower on October 19 as inventories rose and a mine strike ended, so that sector news does not clearly explain the pre-market gain.