** Shares of rare earths and critical minerals companies fall between 1.8% and 7%

** U.S. Vice President JD Vance told a meeting of than 50 countries aimed at boosting access to critical minerals that the U.S. will establish a system creating price floors for the commodities

** United States is proposing a trading bloc for critical minerals and many countries had already signed on to the plan, Vance says

** MP Materials MP.N down 2.4%, US Rare Earth USAR.O falls 6%, Critical Metals CRML.O declines 5.2%

** American Resources AREC.O down 6.7%

** Shares of other critical minerals and metals companies fall as well; United States Antimony UAMY.A down 4.8%, TMC TMC.O declines 1.5%

(Reporting by Arunima Kumar in Bengaluru)

((Arunima.Kumar@thomsonreuters.com; Twitter: https://twitter.com/Aru_Kumar94))