Korea's industrial output expanded in September from a month earlier, led by chips, data showed Friday, with retail sales and facility investment also gaining ground. Industrial production rose 3 percent on-month in September, according to data from the Ministry of Data and Statistics. Output in the mining and manufacturing sector, a key pillar of the economy, soared 9 percent, led mostly by semiconductor production, which jumped 19.2 percent. Retail sales, a gauge of private spending, increased 3.6 percent over the period, driven mainly by durable goods, including cars. Facility investment moved up 5.3 percent on-month in September, the latest findings showed.