As the thinking goes, at lower elevations, minerals like bismuthinite and galena would be vaporized by the heat.
按照这种想法,在低海拔地区,像铋矿和方铅矿这样的矿物会被高温蒸发。
英语百科
Bismuthinite
Bismuthinite is a mineral consisting of bismuth sulfide (Bi2S3). It is an important ore for bismuth. The crystals are steel-grey to off-white with a metallic luster. It is soft enough to be scratched with a fingernail and rather dense.
Bismuthinite forms a series with the lead, copper, bismuth mineral aikinite (PbCuBiS3).