MaterialsEarnings rise on higher prices as importers face battle to curb China dominancePeople gather at the rare-earth elements production section of an exhibition on China’s manufacturing achievements at the National Museum in Beijing on March 24. © ReutersTOKYO -- Chinese rare-earth miners are coming off strong years and staying bullish ahead of President Xi Jinping's summit this week with American counterpart Donald Trump, where the critical minerals are likely to feature in discussions.