The second phase of Samsung's chip plant in Northwest China's Shaanxi province, with a total investment of $15 billion, will start mass production in 2020, Samsung China Semiconductor Co Ltd said Tuesday.

The first part of the second phase in Xi'an, with an investment of $7 billion, is expected to be completed and put into operation next March. The second part is scheduled to be finished in the second half of 2021, according to the company.

Samsung signed an agreement with the Shaanxi provincial government in 2017 to start the second phase of the chip plant to expand chip production capacity.

The first phase of the plant went into operation in May 2014.