* Company advises will be impact on shipments
* Lead production cut by about 6,000 tonnes
* Zinc production unaffected
TORONTO, Nov 18 (Reuters) - Teck Resources TCKb.TO has warned customers there will be an "impact" on lead shipments due to the temporary shutdown of a furnace at its Trail, British Columbia, facility for repairs, a company spokesman said on Wednesday.
Production of lead will likely fall by around 6,000 tonnes to about 79,000 tonnes this year, assuming repairs to the furnace go as planned, said Richard Deane, a spokesman for the Trail smelter and refinery operations.
"We've had to advise some customers of an impact on our lead shipments as a result of this, but the amount is not expected to be material," he said.
The Vancouver, British Columbia-based metals producer idled the furnace on Nov. 10 following an equipment failure, and expects repairs to take a total of three weeks.
The refinery will continue to refine lead from inventory, which will reduce the impact of the shutdown, Deane said.
Zinc production at Trail has not been affected, he said.
The company's shares were up 74 Canadian cents at C$36.63 on the Toronto Stock Exchange.
$1=$1.05 Canadian Reporting by Cameron French; editing by Rob Wilson