Table 6 Comparative analysis of optimization results.
From: Optimization of ore production scheduling strategy using NSGA-II-GRA in open-pit mining
Price fluctuation range (%) | Ore output at extraction point (t) | Quarterly ore output (t) | Average calcium oxide grade (%) | Average magnesium oxide grade (%) | Ore market value (ten thousand CNY) | Unit extraction cost (CNY/t) | Production target achievement rate (%) | Quarterly total cash flow | ||
|---|---|---|---|---|---|---|---|---|---|---|
I | II | III | ||||||||
Original plan (without price fluctuation) | 97,000 | 350,000 | 486,000 | 933,000 | \(\ge 48\) | \(\ge 2.5\) | 9105 | 10.28 | 96 | 8147 |
GA | 84555 | 392332 | 491994 | 968900 | 51.29 | 2.30 | 9454 | 10.27 | 97.2 | 8459 |
NSGA-II-GRA Solution 1 [−10, 0) | 132,296 | 444,519 | 512,139 | 1,088,954 | 51.36 | 2.28 | 9673 | 10.25 | 97.6 | 8557 |
NSGA-II-GRA Solution 2 (0, 10] | 193,987 | 443,428 | 486,861 | 1,124,276 | 51.44 | 2.26 | 11,974 | 10.24 | 97.2 | 10823 |
Origin Error (%) Solution 1 | 36.39 | 27.01 | 5.38 | 16.72 | 7.00 | 8.80 | 6.24 | 0.29 | 1.67 | 5.03 |
Origin Error (%) Solution 2 | 99.99 | 26.69 | 0.18 | 20.50 | 7.17 | 9.60 | 31.51 | 0.39 | 1.25 | 32.8 |
