The United States' attempts to secure a bilateral agreement with Brazil regarding critical minerals have stalled, as Brazilian officials have not responded to two proposals. This lack of response leaves Washington without a key partnership in its efforts to diversify rare earth supply chains and reduce reliance on China. The US invited Brazil to join the Minerals Security Partnership – a US-led initiative focused on coordinating investment in mineral supply chains – years ago, but a formal agreement has not materialized. This situation arises as China continues to exert significant influence in the global minerals market. The stalled talks were highlighted at Latin America’s largest mining fair, signifying growing concerns over securing access to vital resources. The absence of a deal underscores the challenges the US faces in building alternative supply chains independent of Chinese dominance. The United States is now actively looking for other possible partners in this endeavor.