Metallurgical —Adjusted EBITDAR for the three and nine months ended September 30, 2016, was negatively impacted by multi-year lows in pricing for metallurgical coal. Persistent oversupply from significant investments early in the decade, particularly in Australia, long term anemic economic growth in OECD nations, and slowing economic growth in China led to a multi-year cyclical downturn in metallurgical coal pricing. Our metallurgical segment sold 1.6 million tons of coking coal, 0.1 million tons of PCI Coal, and 0.4 million tons of associated thermal coal in the third quarter of 2016 and 4.8 million tons of coking coal, 0.4 million tons of PCI Coal, and 1.6 million tons of associated thermal coal in the first nine months of 2016. Longwall operations accounted for approximately 66% of our shipment volume in the third quarter and 65% of our shipment volume in the first nine months of 2016.
Other Thermal— Adjusted EBITDAR for the three months ended September 30, 2016 benefited from increasing natural gas pricing discussed in the Powder River Basin segment above, and increasing international thermal coal prices began to reach levels that supported thermal export sales from our West Elk operation late in this quarter. This contrasted with the first half of 2016, which was negatively impacted by the low natural gas pricing discussed in the Powder River Basin segment above. Furthermore, international thermal prices did not support thermal export sales at any of our operations during the first half of 2016.