AVERAGE ANALYSIS OF MATERIALS SMELTED
| Name | SiO2 | FeO | CaO | MgO | ZnO | Al2O3 | Fe2O3 | S | Pb | Cu | Ag | Au |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mo. iron ore | 10.0 | 65.0 | ; | ; | ; | ; | ; | ; | ; | ; | ; | ; |
| Lime rock | 1.5 | ; | 52.0 | ; | ; | ; | ; | ; | ; | ; | ; | ; |
| Mo. galena | 1.5 | 2.4 | ; | ; | 9.5 | ; | ; | 11.0 | 74.0 | ; | ; | ; |
| Av. of beds | 50.8 | 16.2 | ; | ; | 4.6 | ; | ; | 3.3 | 9.1 | ; | ; | ; |
| Residue[14] | 10.5 | 38.5 | ; | ; | 18.0 | ; | ; | 4.8 | 2.2 | 1.0 | 10.0 | 0.03 |
| Roasted matte[15] | 9.0 | 48.0 | 3.0 | ; | 10.0 | ; | ; | 4.0 | 9.9 | 3.0 | 21.0 | 0.06 |
| Barrings | 18.8 | 24.4 | 5.0 | ; | 14.5 | ; | ; | 6.0 | 25.4 | ; | 13.0 | 0.07 |
| Coke ash | 27.0 | ; | 14.9 | 4.5 | ; | 19.7 | 31.6 | ; | ; | ; | ; | ; |
| H2O | V.M. | F.C. | Ash | S | ; | ; | ; | ; | ; | ; | ; | |
| Coke[16] | 1.2 | 2.3 | 85.7 | 11.1 | 0.9 | ; | ; | ; | ; | ; | ; | ; |
ANALYSIS OF BULLION, SLAG AND MATTE PRODUCED
| Bullion | Slag | Matte | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ag | Au | SiO2 | FeO | MnO | CaO | ZnO | Pb | Ag | Ag | Au | Pb | Cu | |
| Feb. | 90.0 | 1.15 | 31.2 | 35.9 | 1.0 | 14.5 | 10.3 | 0.88 | 0.98 | 19.0 | 0.04 | 8.7 | 1.5 |
| March | 93.1 | 1.63 | 31.3 | 37.2 | 1.0 | 13.9 | 11.1 | 0.71 | 1.30 | 21.0 | 0.06 | 8.0 | 2.5 |
| April | 104.3 | 1.59 | 29.8 | 37.7 | 2.7 | 13.9 | 11.4 | 0.52 | 1.40 | 23.0 | 0.07 | 7.0 | 3.5 |
| May | 90.0 | 1.24 | 30.0 | 37.3 | 2.2 | 14.1 | 9.3 | 0.86 | 1.10 | 25.4 | 0.07 | 5.1 | 4.0 |
| July | 78.7 | 1.00 | 32.2 | 37.4 | 1.0 | 13.9 | 9.8 | 0.50 | 1.15 | 21.3 | 0.03 | 8.9 | 4.0 |
| Aug. | 90.8 | 1.21 | 31.2 | 37.1 | 1.7 | 13.7 | 9.6 | 1.10 | 1.60 | 23.1 | 0.08 | 9.8 | 3.0 |
| Sept. | 65.3 | 2.58 | 32.0 | 39.7 | 0.8 | 14.1 | 8.1 | 0.80 | 1.30 | 18.6 | 0.06 | 7.6 | 2.3 |
| Average | 87.5 | 1.49 | 31.1 | 37.5 | 1.5 | 14.1 | 10.0 | 0.77 | 1.26 | 21.6 | 0.06 | 7.8 | 3.0 |
MONTHLY RECORD OF FURNACE OPERATIONS
| Blast Ounces | Tons per F. D. | Per Cent. Pb. on Charge | Per Cent. Coke on Charge | Per Cent. Slag on Charge | Per Cent. S on Charge | Matte Produced | Saving | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Ag | Au | Pb | ||||||||
| Feb. | 21 | 42.5 | 9.0 | 12.0 | 30.0 | 3.7 | 8.0} | 84.4 | 83.0 | 90.3 |
| March | 21 | 44.8 | 9.7 | 13.5 | 37.0 | 4.0 | 9.0} | |||
| April | 21 | 43.7 | 9.0 | 13.5 | 35.0 | 4.3 | 10.0 | 97.9 | 70.5 | 96.6 |
| May | 21 | 49.4 | 10.0 | 13.5 | 30.0 | 3.5 | 6.5 | 95.6 | 109.5 | 88.8 |
| July | 17 | 41.0 | 9.8 | 12.5 | 34.0 | 3.8 | 6.0 | 97.9 | 90.0 | 92.9 |
| August | 18 | 47.0 | 9.3 | 13.0 | 32.0 | 3.7 | 6.3 | 86.2 | 107.5 | 87.6 |
| Sept.[17] | 15 | 51.0 | 7.3 | 13.0 | 30.0 | 2.8 | 4.6 | 92.9 | 94.0 | 95.6 |
| Average | 45.6 | 9.1 | 13.0 | 32.6 | 3.7 | 7.2 | 90.8 | 92.4 | 92.0 | |
I believe that, in smelting residues high in zinc oxide, better metallurgical results would be obtained by using a dry silicious ore in connection with a high-grade galena ore, provided the residue be low in sulphur. This was confirmed to a certain degree in actual practice, as the furnace worked very well upon increasing the percentage of Cripple Creek ore on the charge. This would also seem to indicate that alumina had no bad effect on a zinky slag.