The occurrence of gold rich carbonaceousrock series and the extensive development of altered rock bodies in the region made the mobilization and concentration of gold possible.
区域上赋金层炭质岩系的存在和蚀变体的广泛发育，使金元素活化、富集成为可能。
2
That is a necessary but not a sufficient condition, as the type of rock involved, called carbonaceous chondrite, is found in other asteroids, too.