Far Cry 3 Episode 7: Unhappy Reunion

"The ancient compass leads Jason to an abandoned mining facility. Inside, he finds his way to some old Chinese ruins, and retrieves the third piece of the compass, though the knife still eludes him."
"The ancient compass leads Jason to a cenote and a cave complex. Inside, he finds his way to some old Chinese ruins, and retrieves the Chinese dagger that Buck and Citra are looking for."
"Jason brings the ancient Chinese knife to Buck and trades it for Keith."