Which country assisted Pakistan in the construction of Sandak Project?

Which country assisted Pakistan in the construction of Sandak Project?

سیندک پراجیکٹ کی تعمیر میں کس ملک نے پاکستان کی مدد کی؟
Explanation

Saindak was made in the 1970s in collaboration with a Chinese engineering firm.

Large deposits of copper and gold have been discovered in Saindak

The project was started in 1995 by the Government of Pakistan.

This Mine is located near Saindak town in the Chagai Balochistan