从智利的硝石矿里。
早期的中国科学家发现把硫磺，木炭和硝石混合在一起可以制作出能够爆炸的物质。
Early Chinese scientists discovered that they could make an explosive substance by mixing sulphur, charcoal and saltpeter.
钠硝石矿体连续性好，层位稳定， 矿石品位较高，采选技术简单，易于开发利用，应开展深入的地质勘查工作。
The ore body is continuous and stable, and the ore grade is high. The deposit is easy to exploit and utilize. More deep exploration work should be done in this region.
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