In the whole city the proven mineral reserves are of 53 kinds , of which the kerogen shale is 5 . 1 billion tons , kaolin over 0 . 3 billion tons , ranking first in the country . rare earth and porphyrite tin are big mines on the country scale ; xinyi jade mine , reputed as " jade of the south " is one of the three big jade mines in the country 全市已查明矿藏53种，其中油母页岩51亿吨，高岭土储量3亿多吨，均居全国首位；稀土、斑岩型锡矿属全国大矿；被誉为“南方璧玉”的信宜玉石矿是全国三大玉石矿之一。
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