By July 1942, Mallinckrodt was producing a ton of highly pure oxide a day, but turning this into uranium metal initially proved more difficult for contractors Westinghouse and Metal Hydrides.
Fra juli 1942 fremstillede Mallinckrodt et ton meget rent uranoxid om dagen, men det viste sig i starten at være meget svært at omdanne det til uranmetal for underleverandørerne Westinghouse og Metal Hydrides.