Table 1 chrome ore grade and mining technical indicators
project | Deposit and ore type | ||
Endogenous deposit | |||
Rich mine | Lean mine | ||
ω(Cr 2 O 3 )% | Boundary grade | ≥25 | ≥5 |
Minimum industrial grade | ≥32 | ≥12 | |
Minimum mining thickness | 0.3~0.5 | 1.0 | |
Stone removal thickness | 0.5 | 1.0 | |
Note: 1, with metallurgical ω (Cr 2 O 3) / ω (FeO)> 2 chromium or iron ore concentrates, pyrometallurgical (wet refining of metallic chromium is not limited thereto); ω (SiO 2) ≤ 8% (not limited by smelting high carbon chromium by ore heat method); ω (P) ≤ 0.09%, ω (S) ≤ 0.05%.
2. Chromite or concentrate for refractory materials, ω(SiO 2 )≤10%, ω(CaO)≤2%, ω(FeO)≤14%.
3. For chromite or concentrate for Chemical industry, ω(SiO 2 )≤8%, ω(Al 2 O 3 )≤15%.
4, chrome ore with chrome ore, ω (Cr 2 O 3 ) ≥ (10 ~ 20%), ω (SiO 2 ) ≤ 10%.
5, when the required amount of associated chromite selected from PGE reached (0.3 - 0.4) × 10 -6 time, should be assessed.
7. The selection of the minimum mining thickness of the rich ore is 0.5m for the single ore layer and 0.3m for each layer of the double ore layer.
Table 2 General requirements for industrial indicators of nickel deposits
Project | Nickel sulfide ore | Nickel oxide-nickel silicate | |||
Primary ore | Oxidized ore | ||||
Pit mining | Lucai | Pit mining | Lucai | ||
Boundary grade (mass score) % | 0.2 to 0.3 | 0.2 to 0.3 | 0.7 | 0.7 | 0.5 |
Minimum industrial grade (quality score) % | 0.3 to 0.5 | 0.3 to 0.5 | 1 | 1 | 1 |
Average grade of mineral deposit (mass fraction) % | 0.8～2.0 | 0.6~1.0 | 1.5 | 1.2 | |
Minimum recoverable thickness m | 1 | 2 | 1 | 2 | 1 |
Stone removal thickness m | ≥2 | ≥3 | ≥2 | ≥3 | 1 to 2 |
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