• 1. complex refractory ore: 复杂难选矿石
• 2. Complex refractory iron ore: 复杂难选铁矿石
• 3. Multimetal complex refractory gold ore: 多金属复杂难选金矿

更多释义

• 1.Manganese ore resources are rich in China, yet with fewer rich ores but more low-grade ores, complex ores and fine refractory ores. rich ore resources are in critical shortage presently.
  在我国，锰矿资源虽然十分丰富，但富矿少，贫矿、复杂矿和细粒难选矿多，富矿资源目前严重短缺。
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