Russian to English Tech/Engineering Chemistry; Chem Sci/Eng found on resume

This word was found in a CV which I am translating. The general experience of the person's CV relates to mineral exploration, mining and geology. Can someone please offer a translation for this word (плавикошпатовый) in the context of this sentence. I think it has something to do with smelting (cf. the link with плавильный), but the rest I am not sure about. Here is the full context:

"В результате ХХХ стал одной из крупнейших плавикошпатовых сырьевых баз СССР"