Brazilian mining company Vale, after closing another dam, has published information about the deterioration of its forecast for sales of iron ore and iron ore pellets this year. The forecast is downgraded from the mid-range from 307 million to 332 million tonnes to between the lower and middle parts of this range. The deterioration in the forecast caused an increase in iron ore prices on Tuesday. Iron ore contracts rose 1.7 per cent in Singapore. Prior to that, their value fell to its lowest level since August for 4 days. Less significant increases in iron ore prices were noted on the Dalian Commodity and Commodity Exchange. According to Bloomberg, experts expect that sea supplies of ore will decrease in the near future, which compensates for the signs of weakening demand for it.