12 April 2017. The SAA is aiming to reach the villages of Sawanah and Khunayfis, and the nearby phosphate mine along the Palmyra-Al-Seen highway.

SOUTH FRONT

https://southfront.org/syrian-army-advancing-further-in-southern-palmyra-countryside

At industryabout.com:

Al Sharqiyah Phosphate Mine

Khunayfis Phosphate Mine

Syria and Iraq War - Industrial Map