Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) DOI Keiji and NOMAGUCHI Tomoyoshi and IMARI Shinji,Trial Extraction of Ore at Ningyo-toge Mine,Journal of the Mining and Metallurgical Institute of Japan,03694194,The Mining and Materials Processing Institute of Japan,1962,78,890,571-580,https://cir.nii.ac.jp/crid/1390282680958796800,https://doi.org/10.2473/shigentosozai1953.78.890_571