In 2019, the average monthly price of tantalum ore decreased to about 158 per kilogram of Ta. 2. O. 5. content in October from about 173 per kilogram of Ta. 2. O. 5. content in January. This average monthly price in 2019 represented a decrease of about 26% from the average monthly price in 2018. The decrease in tantalum ore prices in 2019 was