Majia's ancestral home is Changbai Mountain, and he followed Nurhachi in the early years of the late Jin Dynasty. His ancestors were Mamudun, the second was Heide Mulgen, the third was Duoqi, the fourth was Safong 'a, the fifth was Caisan, the sixth was Fengmen 'er, the seventh was Ningta, and the eighth was Nimaha ... After moving to Beijing, most people in the family took Ma's surname, and some people took their own. Celebrities of this family include Tu Hai, the general of the Qing Dynasty, and Ying Shao, the head of the internal affairs office. Now the descendants of the main branch have descendants of this family in Shenyang, Liaoning, Northeast China, Beijing, Chengde, Tianjin and other places.
Among the Fuxi people, their ancestral home is Jiudaogou in Changbai Mountain, and their ancestors are Shajina Fuxi people in Tandu. Because of the arrogance of the fourth grandfather, Shajicheng was built, so it was named Fu Cha, Shojaei. The family was married into the royal family of the Qing Dynasty for generations, and Shaji City was captured by the Ming Dynasty, and the fourth great-grandfather Wang led his troops to Nuerhachi. The fifth ancestor was Wan, the sixth was Haxitun, and the seventh was Mi, who gave birth to four sons: Masha, March, Ma Wu and Li Rongbao. These four sons were senior officials in Kangxi and Yongzheng periods. To commemorate the descendants of Ma Qi and Ma Wu, some people take Ma as their surname. And most surnames are rich. Now there are descendants of this family all over the country.
Your ancestors were able to mine in Mentougou, which also proved that they were relatively rich at the beginning, so they could buy coal mines during the Republic of China. I worked in the Qing Palace Department, specializing in mine management. The above two are very likely. I suggest you go to the Beijing Historical Archives Management Office to check the relevant roster of the Eight Banners Hanlin in Manchuria in the late Qing Dynasty. Maybe you can find it.