No decision will be made until the end of 2020, when the company expects to have completed a study on the Jadar, which is estimated to contain 10% of the world's lithium reserves.
The Piskanja project has an indicated mineral resource of 7.8 million tonnes averaging 31% B2O3, and an inferred resource of 3.4 million tonnes averaging 28.6% B2O3.
Poland's prime minister and other government officials will meet on Tuesday to discuss a threat by Australia's Prairie Mining to sue Warsaw over difficulties it faced in developing coal projects.
The world's largest steelmaker cut its forecast for demand in its main market Europe on Thursday after lower steel prices depressed earnings at the start of the year.