EXHIBIT 21 ATLAS CORPORATION LIST OF SUBSIDIARIES OF THE REGISTRANT Atlas Precious Metals, Inc. (incorporated in Nevada) Atlas Gold Mining Inc. (incorporated in Nevada), a subsidiary of Atlas Precious Metals, Inc. Cornerstone Industrial Minerals Corporation (organized under the laws of Ontario, Canada) Arisur Inc. (organized under the laws of Grand Cayman). Suramco Metals, Inc. (organized under the laws of Nevada).