This dataset is a market activity dataset, representing a combination of provincial-level 'magnetite ore' markets within Northeast China, forming the 'magnetite ore' market group for the Northeast region. Transportation losses, transport vehicles, and transportation infrastructure are not included in this dataset; they are covered in the respective provincial market datasets. Northeast China includes the provinces of Liaoning, Jilin, and Heilongjiang. Data sources include the China Communications Yearbook, China Energy Statistical Yearbook, China Statistical Yearbook, and customs statistics from the General Administration of Customs.