The sector’s PPI for the 12 months to Sept. 22, marking the end of summer, increased by 6.3%, the report added. The overall PPI of mining sector (using 2011 as the base year) stood at 234.6 in fall, indicating a 5.7% increase compared with the previous quarter (summer) and an 18.8% increase over the same season of last year, according to Financial Tribune.