** UK's metals and miners index .FTNMX551020 falls 4% to its lowest level since February 2021
** Prices of metals drop on worries about new U.S. tariffs due this week as President Donald Trump said reciprocal tariffs he plans to introduce will apply to all nations
** Anglo American AAL.L and Glencore GLEN.L fall 4.2% and 4.4%, respectively
** Rio Tinto RIO.L loses 3.8%, Antofagasta ANTO.L declines 3%
** Anglo American, Glencore and Rio Tinto among top pct losers on FTSE 100 .FTSE index
** Ferrexpo FXPO.L down 3.6%