Shingen saw his superb ability in accounting, and made him government official who handled general affairs such as the establishment of mines such as Kurokawa Gold Mine as well as taxes within the estate of Takeda.
つまり信玄は長安の優秀な経理の才能を見抜いて、武田領における黒川金山などの鉱山開発や税務などの庶務を任せる行政官として採用したのである。