ABC Company purchased a mine in 2017 for $3,400,000. It was estimated that the mine contained 200,000 tons of ore and that the mine would be worthless after all of the ore was extracted. The company extracted 25,500 tons of ore in 2017 and 30,000 tons of ore in 2018. In 2017, ABC Company sold 22,000 tons of ore. In 2018, the company sold 15,000 tons of ore. What is book value of the mine at December 31, 2018