The proposed open-pit surface and underground spodumene mine will produce lithium, highly used in the manufacturing of batteries for cell phones and electric cars.
The company also said it will spend between $850 and $900 to produce an ounce of gold this year, less than its previous forecast of between $875 and $950.
A group of demonstrators, however, continued to block some access roads on Thursday morning, attempting to seize a bus that was heading to the nearby Gabriela Mistral mine.