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一九七二年期间,国外金属矿床勘探的重点仍放在奥大利亚的铝(铝土矿)、铜、铁、镍、铀和锌;加拿大不列颠哥伦比亚和育空地区的铜、铅、钼和锌;印度尼西亚的硷金属和镍以及中、南非州的铜和镍。通过实验证明由钠明矾石炼取金属铝在经济和技术上都是可能的,这就提高了人们对国内钠明矾石矿床的兴趣。在犹他州塞达城(Cedar City)附近所发现的一个铀明矾石矿床估计蓄量为6亿吨,含钠明矾
During 1972, the exploration of foreign metal deposits is still focused on aluminum (bauxite), copper, iron, nickel, uranium and zinc in Australia; copper, lead, molybdenum in British Columbia and Yukon, Canada And zinc; alkaline metals and nickel from Indonesia and copper and nickel from Central and South Africa. Experiments have shown that it is economically and technically possible to purify metallic aluminum from sodium alunite, which has raised interest in domestic sodium alunite deposits. An uranium alum stone deposit found near Cedar City, Utah, is estimated to contain 600 million tonnes of sodium alum