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Ore loss and dilution of the product is a contradiction, but also to measure an important indicator of the economic effects of mines, and mines and mining costs have a direct economic relations, non-ferrous and precious metals mine especially. The increase and decrease of loss and depletion often maintain the opposite relationship, that is, the ore loss decreases with the increase of ore depletion, or the ore depletion decreases with the increase of ore loss, but the resources of a mine are very limited and must be cherished. In order to evaluate the economic loss of ore, to help mine management decisions, to make the resources as much as possible for my use, it is necessary to study the reasonable range of mine loss depletion.
According to the characteristics of economic loss caused by the depletion of ore loss, the sum of the economic losses of the two has a minimum value, and we can use this feature to control the recovery range and cut-off grade. It should be noted that the ore body has a gradual relationship with the surrounding rock. When the surrounding rock contains grades, the ore depletion rate is less than the waste rock mixing rate and the mutation relationship; when the surrounding rock grade is relatively low or does not contain the grade, the ore depletion rate is Waste rock mixing rate.
In the mining process, for every ton of ore lost, the economic loss of the enterprise is equal in value to the profit of one ton of ore produced by the enterprise (without considering the comprehensive benefits of the society), and the treatment cost per ton of waste rock is equal to one ton. The child's palace and cost of the ore are calculated as:
Value per ton of raw ore: K = (1 - Ï) É‘ · ε • n / (γ · N)
The combined cost per ton of raw ore: C = C 1 + C 2 + C 4 + C 5
Economic loss per ton of raw ore lost: S=KC
As a special case, precious metal mines increase the smelting recovery rate and smelting cost on the basis of the above, and better reflect the impact of loss depletion. The formula is: K 1 =(1-Ï)ɑ·ε·β•η 1
C=C 1 +C 2 +C 3 +C 4 +C 5
Where K, K 1 - the value per ton of ore and the metal price per ton of ore (yuan)
Ï——Ore depletion rate (%)
ɑ——Ore grade (%)
ε-- recovery rates (%)
Β——smelting recovery rate (%)
N - dressing ratio
Γ——concentrate grade (%)
η , η 1 —— concentrate price and finished product price (yuan)
C——Oral comprehensive cost (yuan)
S——Economic loss per ton of ore lost (yuan)
C 1 + C 2 + C 3 + C 4 + C 5 - costs and costs for ore mining, beneficiation, smelting, corporate management fees and non-operating expenses, respectively.
According to the above formula, the calculation results are included in the comprehensive analysis table of loss and depletion (different grades, different losses), and the economic loss and depletion and ore grades of each ton of ore lost are calculated accordingly.
Diagram of depletion rate, grade, and economic loss
Based on the above analysis, the following conclusions can be drawn:
(1) The higher the depletion rate of mining, the lower the economic value of ore, the lower the depletion rate, and the higher the economic value of ore.
(2) ABCDE in the figure is the corresponding ore grade when the ore depletion rate is different. At this point, the loss of one ton of ore enterprise economic loss and the value of mixing one ton of waste rock is higher than the processing cost of mixing one ton of waste rock, when the grade is low. The opposite is true.
(3) In the figure, abcde is the break-even point when the depletion rate is different. When the grade is higher than this, the mining will be profitable, and when it is low, it will lose. Under these conditions, measures should be taken to reduce the depletion rate index, and the ore can be used, otherwise it should be treated as waste rock.
(4) For high-grade ore, the value of the lost ore is higher than the cost of treating the waste rock. At this time, it is better to deplete the ore.
(5) For ore with medium grade, the value of loss of ore is not much different from the cost of treating waste rock. Which one is unreasonable, we must consider two factors to achieve a reasonable level.
(6) For low grade ore, the depletion rate indicator is an important factor that must be strictly controlled.
This article is a little experience of the author's mine management on mine depletion management, indicating that the subtle changes in source quality have a great impact on mine output, and at the same time provide some help to mine decision-making.
Author: He Huiwen, Chinese iron ore steel Yangjiaba