The United States has strengthened its ties with Pakistan as Missouri-based US Strategic Metals signed a $500 million investment deal to boost foreign investment in the country’s mineral sector.Pakistan’s Frontier Works Organization, the largest miner of critical minerals, formalised the agreement on Monday through a memorandum of understanding with the American firm, paving the way for the establishment of a poly-metallic refinery in Pakistan.The agreement follows a trade pact signed between Washington and Islamabad last month, which Pakistan hoped would encourage US investment in its vast mineral...