Natural resources are also abundant with large deposits of coal, natural gas, and more than 40 kinds of minerals such as strontium and manganese. Coal reserves total approximately 4,800,000,000 metric tons (4.7×109 long tons; 5.3×109 short tons). Chuandong Natural Gas Field is China's largest inland gas field with deposits of around 270 billion m3 – more than 1/5 of China's total.