Could be the old Porgera strip, now closed with a market built on it. Now replaced with Kairik airfield nearby. RAAF crashed a Caribou there mid sixties. Definitely steep one way, finals were commenced at 7500’ on area qnh. Wreckage still there late 60s early 70s. Engines removed by others! Surface rough as guts. Barrick still operating an underground mine there today.