1. Main minerals
Gold is a yellow metal with a strong metallic luster. Nearly 20 types of gold minerals have been discovered. Divided into ① natural elements, natural alloys and intermetallic compounds; ② sulfide; ③ selenide; ④ telluride; ⑤ antimonide and so on. The most common are the natural elements of gold and tellurides. The main ones are natural gold, which contains more than 80% gold, and gold and silver mines contain 50% gold. In nature, gold often coexists with silver, and is closely related to minerals such as pyrite, galena, arsenopyrite, sphalerite, chalcopyrite, tetrahedrite, molybdenite, etc., and often grows with them. together.
2. Industrial requirements
Cut-off grade: 1-2g/t
Lowest industrial grade: 3-5g/t
Average grade of ore deposit: 5-8g/t
Available thickness: ≥0.8-1.5m
Stone removal thickness: ≥2-4m
Elimination length of non-ore section:
When the upper and lower tunnels correspond to 10-15m
When the upper and lower tunnels do not correspond to 20-30m
Note: ① For grade index, when the construction conditions for easy mining and selection of ore are good, the lower limit is adopted; otherwise, the upper limit is adopted.
②The lower limit of the minimum recoverable thickness and the thickness of the inclusions removed when the deposit is steep; otherwise, the upper limit is adopted.
| Item | Open pit mining | Underground mining | |||||
Full mining | Mining separately | ||||||
Gold dredger mining | Water gun mining | ||||||
South | North | ||||||
50-100L | 150-300L | 50-100L | 150-300L | ||||
Mixed sand boundary grade(g/m3) | 0.05-0.07 | 0.04-0.06 | 0.06-0.08 | 0.05-0.07 | 0.1 | 0.3-0.5 | |
Lowest industrial grade of mixed sand block(g/m3) | 0.16-0.18 | 0.14-0.16 | 0.18-0.20 | 0.16-0.18 | 0.3 | 0.6-1.0 | |
Minimum thickness(m) | 30-50 | 40-60 | 30-35 | 40-60 | 20 | ||
Removal width of non-mineralized section (stone)(m) | 30-35 | 40-60 | 30-35 | 40-60 | |||
Minimum recoverable sand volume of ore body | 150-450 | 900-2000 | 100-300 | 600-1400 | |||
Boundary grade of ore layer(g/m3) | 1 | ||||||
The lowest industrial grade of the ore bed(g/m3) | 3 | ||||||
Mining width height of ore layer(m) | 1.3-1.5 | ||||||
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